The Hacker's Encyclopedia 1998

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---[ Phrack Magazine Volume 8, Issue 52 January 26, 1998, article 11 of 20 -------------------------[ The Subscriber Loop Carrier (slick) --------[ Voyager[TNO] =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= I............................................... Overview II.............................................. The Central Office Terminal III............................................. The Remote Terminal IV.............................................. SLC-2000 Shelves V............................................... Where might you find an RT? VI.............................................. SLC Interface Software VII............................................. SLC Glossary VIII............................................ SLC Vendors +----------+ | Overview | +----------+ A Subscriber Loop Carrier (SLC) (often pronounced "slick") is a multiplexer which allows a large number of analog lines to be provided over a very small number of digital lines. A good example is the AT&T SLC 5, which allows 192 subscriber loops to be provided through two or four digital lines. SLCs are also referred to as Digital Loop Carriers (DLCs). The first SLC was installed in 1971. As of 1995, between 5 and 10% of all lines are served by SLCs, as are roughly 50% of all new lines built each year. SLCs are available from quite a few vendors. This article focuses on the extremely popular SLC-2000 from AT&T. A SLC usually consists of two separate subsystems, the Central Office Terminal (COT) and the Remote Terminal (RT). The COT is connected to the RT via a DS1 circuit. The DS1 circuit may be carried over actual T1 lines, or it may be carried over another medium such as lightwave or digital radio. The RT is then connected to the subscribers using a Voice Frequency (VF) circuit. The VF circuit is what you and I would recognize as our normal phone line. This diagram illustrates a subscriber loop constructed using an SLC: +---------+ | | /---------\ | Central | +----+ /-----------\ | Office | | | | | --- DS1 circuit --- | RT | --- VF circuit -- | Residence | | (COT) | | | | | | | +----+ +-----------+ +---------+ +-----------------------------+ | The Central Office Terminal | +-----------------------------+ The SLC-2000 COT is a modular design usually consisting of the following components: . Access Resource Manager (ARM) shelf . Metallic Distribution Assembly (MDS) shelves . Heat Baffles . Alarm and Test Unit (ATU) +--------------------------+ | | | | | | | | | | <------- Alarm and Test Unit |--------------------------| | | | <------- Heat baffle |--------------------------| |||||||||||||||||||||||||||| |:::::::::::::::::::;::;:::| <--\ |--------------------------| \___ Access Resource Manager (ARM) shelf |:;;;;;;::;::::::::||||||||| / |.##||||.|,,,,,,,,,........| <--/ |.##||||' '''''''''||||||||| |--------------------------| | | | <------- Heat baffle |--------------------------| |!!!!!!!!!!^^||^^!!!!!!!!!!| <------- Metallic Distribution Shelf (MDS) |!!!!!!!!!!^^||^^!!!!!!!!!!| |--------------------------| |!!!!!!!!!!^^||^^!!!!!!!!!!| <------- Metallic Distribution Shelf (MDS) |!!!!!!!!!!^^||^^!!!!!!!!!!| |--------------------------| | | | <------- Heat baffle |--------------------------| |!!!!!!!!!!^^||^^!!!!!!!!!!| <------- Metallic Distribution Shelf (MDS) |!!!!!!!!!!^^||^^!!!!!!!!!!| |--------------------------| |!!!!!!!!!!^^||^^!!!!!!!!!!| <------- Metallic Distribution Shelf (MDS) |!!!!!!!!!!^^||^^!!!!!!!!!!| +--------------------------+ +---------------------+ | The Remote Terminal | +---------------------+ The SLC-2000 RT is a modular design usually consisting of the following components: . Access Resource Manager (ARM) shelf . Metallic Distribution Assembly (MDS) shelves . High Density Fiber Optics Shelf (HDOS) shelves (FITL only) . Cooling fans An SLC-2000 RT configured for a Metallic Application ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +--------------------------+ | | | <------- Fan unit |--------------------------| |||||||||||||||||||||||||||| |:::::::::::::::::::;::;:::| <--\ |--------------------------| \___ Access Resource Manager (ARM) shelf |:;;;;;;::;::::::::||||||||| / |.##||||.|,,,,,,,,,........| <--/ |.##||||' '''''''''||||||||| |--------------------------| |!!!!!!!!!!^^||^^!!!!!!!!!!| <------- Metallic Distribution Shelf (MDS) |!!!!!!!!!!^^||^^!!!!!!!!!!| |--------------------------| |!!!!!!!!!!^^||^^!!!!!!!!!!| <------- Metallic Distribution Shelf (MDS) |!!!!!!!!!!^^||^^!!!!!!!!!!| |--------------------------| |!!!!!!!!!!^^||^^!!!!!!!!!!| <------- Metallic Distribution Shelf (MDS) |!!!!!!!!!!^^||^^!!!!!!!!!!| |--------------------------| |!!!!!!!!!!^^||^^!!!!!!!!!!| <------- Metallic Distribution Shelf (MDS) |!!!!!!!!!!^^||^^!!!!!!!!!!| +--------------------------+ An SLC-2000 RT configured for a Fiber In The Loop (FITL) Application ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +--------------------------+ | | | <------- Fan unit |--------------------------| ||^||^||^||^||^||^||^||^||^| <------- High Density Optics Shelf (HDOS) #2 ||^||^||^||^||^||^||^||^||^| |--------------------------| ||^||^||^||^||^||^||^||^||^| <------- High Density Optics Shelf (HDOS) #1 ||^||^||^||^||^||^||^||^||^| |--------------------------| | | | <------- Fan unit |--------------------------| |||||||||||||||||||||||||||| |:::::::::::::::::::;::;:::| <--\ |--------------------------| \___ Access Resource Manager (ARM) shelf |:;;;;;;::;::::::::||||||||| / |.##||||.|,,,,,,,,,........| <--/ |.##||||' '''''''''||||||||| |--------------------------| | | | | ||||| | | | | | <-------- Metallic Distribution Shelf (MDS) #4 | | | | ||||| | | | | | |--------------------------| | | | | ||||| | | | | | <-------- Metallic Distribution Shelf (MDS) #3 | | | | ||||| | | | | | |--------------------------| | | | | ||||| | | | | | <-------- Metallic Distribution Shelf (MDS) #2 | | | | ||||| | | | | | |--------------------------| | | | | ||||| | | | | | <-------- Metallic Distribution Shelf (MDS) #1 | | | | ||||| | | | | | +--------------------------+ +------------------+ | SLC-2000 Shelves | +------------------+ The SLC-2000 is divided into a number of shelves, each of which hold circuit cards that are responsible for specific functions within the SLC. Some shelves are found only in COTs, others are found only in RTs, while most shelves are used in both COTs and RTs. Access Resource Manager (ARM) Shelf ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The ARM shelf provides feeder interface, bandwidth management and circuit maintenance features. The ARM shelf consists of the following functional component groups: . User Interface Panel (UIP) . Integrated Test Head (ITH) . Provisioning Display Controller (PDC) . Bandwidth Management Complex . DS1 distribution . DS1/VT feeder interfaces . SONET feeder The following diagram illustrates the functional components of an ARM shelf: /<-- ESD ground jack |/<-- Power Converter Unit || /<-- Transmission Signaling Unit || | /<-- Analog Measurement Unit || | | /<-- Power Amplifier Unit || | | | /<-- Craft Access Unit || | | | | /<-- System Memory Unit || | | | | | /<-- Provisioning and Display Controller || | | | | | | /<-- Link to Alarm and Networks || | | | | | | | /<-- DS1 interfaces || | | | | | | | | +----------------------------------------------------+ |^ | |----------------------------------------------------| ||P|T| |A|P|C|S|P| |L|D|D|D|D|D|D|D|D|.|.|.|.|.|.|.|.| ||C|S| |M|A|A|M|D| |A|S|S|S|S|S|S|S|S|---------------| ||U|U| |U|U|U|U|C| |N|1|1|1|1|1|1|1|1| | | | | | | | | ||.|.|.|.|.| |.|.|.|.|.|.|.|.|.|.|.|.| | | | | | | | | |------------------------------------+ | | | | | | | | || | | | | | | | | | | | | | | | | | | | | | | | | | | <-\ /-> || | | | | | | | | | | | | | | | | | | | | | | | | | | | | ||.|:|:|:|:|:|:|.|.|:|.|.|.|.|.|.|.|.|:|:|:|:|:|:|:|:| | | ||.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.| | | | | | | | | |-\ /-| |------------------------------------+ | | | | | | | | | | | | || |o|o| | | | | ||| | | | | | | | | |---------------| | | | | ||.|o|o| | | | | |:|:|:|:|:|:|:|:|:|:|.|.|.|.|.|.|.|.| | | | \-> ||.| | | | | | | | |:|:|:|:|:|:|:|:|:| | | | | | | | | >-/ | | ||.| | | | | | | | | | | | | | | | | | | | | | | | | | | | +----------------------------------------------------- | | | | | | | | | | | | | \ / \ \ / / | | \-- Test Head Controller (THC) | | | \ / | \-- System Controller (SYSCTL) | | | | \-- Overhead Controller (OHCTL) | | | \-- STS-1 Multiplexer (MXRVO) | | \--- Optical Line Interface Unit (OLIU) | \-- Synchronous Timing Generator (TGS) | Bandwidth Management Complex --/ The User Interface Panel (UIP) represents the highest level of interaction possible with the SLC-2000 without plugging some other piece of equipment into it. Here is a close-up of the User Interface Panel: Abnormal -->\ AMD (Alphanumeric Message Display) -->\ NE Activity >--\ | Attention -->\ | Major -->\ | | Panel Fault -->\ | | Critical -->\ | | | /<-- ESD ground jack | | | | | | | | | | | | | | | +------------------------------------------------------------------------+ | | ~=~ ~~~ ~~ ~~ ~~~~~~ | __ ____________________ __ __ __ __ | | O |________/----------------| |/ |* User Int. Panel | |/ |/ |/ |/ | | | | __ ~~~~~~~~~~~~~~~~~~~~ __ __ __ __ | | | = = ooo #### ## :::::: | |/ ^v # # # o# # |/ |/ |/ |/ | +------------------------------------------------------------------------+ ||| ||| | | |||||| | | | | | | | | | | | ||| \|/ | | |||||| | | | | | | | | | | | \|/ | | | |||||| | | | | | | | | | | | | | | | |||||| | | | | | | | | | | | Fuses-->/ | | | |||||| | | | | | | | | | | | Power test | | | |||||| | | | | | | | | | | | points -->/ | | |||||| | | | | | | | | | | | CIT connector -->/ | |||||| | | | | | | | | | | | DDS clock conn. -->/ |||||| | | | | | | | | | | | DDS Maintenance Jack -->/||||| | | | | | | | | | | | DS0 Maintenance Jack -->/|||| | | | | | | | | | | | DS1 Maintenance Jack -->/||| | | | | | | | | | | | T-R Maintenance Jack -->/|| | | | | | | | | | | | T1-R1 Maintenance Jack -->/| | | | | | | | | | | | E&M Maintenance Jack -->/ | | | | | | | | | | | Power -->/ | | | | | | | | | | Scroll Buttons ->/ | | | | | | | | | Enter -->/ | | | | | | | | Escape -->/ | | | | | | | LED Test -->/ | | | | | | ACO -->/ | | | | | Update -->/ | | | | Minor -->/ | | | Power Minor ->/ | | FE Activity -->/ | Session -->/ There are many connections on the UIP. The Electrostatic Discharge (ESD) ground jack is for a static control wrist strap. The Craft Interface Terminal (CIT) connector is a DB-25 for plugging in a CIT or a PC running terminal emulation software. The DDS clock connector provides a clock source for test sets. The Power Test Points allow you to monitor the -48v power to the unit. There are many LED's on the UIP. The Attention LED is yellow when the there is something new on the Alphanumeric Message Display (AMD). Thee VF circuit is what you when the UIP is in need of repair. The Power LED is green when -48v power is present. The Power Minor LED is yellow when the system is operating on battery power. The Alarm Cut Off (ACO) LED is green when the ACO button has been pressed during an alarm. The Critical LED is red when a failure has caused a loss of service for 128 or more customers. The Major LED is red when a failure has caused a loss of service for 24 or more customers. The Minor LED is yellow when an error exists, but is not causing a loss of service to any customers. The Near End (NE) Activity LED is yellow when the local terminal has some alarm condition. The Far End (FE) Activity LED is yellow when the remote terminal has some alarm condition. The Abnormal LED is yellow when the SLC-2000 is not in a mode that provides service, such as a test mode. The Session LED is yellow when a technician has a CIT connected to the remote terminal. The most interesting part of the UIP is the Alphanumeric Message Display (AMD) and the buttons associated with its use. The AMD displays a single 24 character line of text. The scroll buttons may be pushed to move forward and backward through various menu choices. The <Enter> and <Escape> keys work just as you might imagine. Three types of messages appear on the User Interface Panel (UIP): . Automatic Messages . Fault Messages . Alarm Messages Automatic Messages are triggered by pressing certain buttons, UIP or PDC unavailability, and SYSCTL installation. Fault Messages are displayed when the RETRIEVE-FAULTS command is selected on the UIP. Alarm Messages are displayed when the RETRIEVE-ALARMS command is selected on the UIP. The Automatic Messages are: . PANEL FAULT . MN:NE:pdc unavail . UPDATE: In-Progress . UPDATE: done . SONET SUBSYS UPDATE done . SYSCTL INITIALIZATION . SYSCTL EXTENDED INITZN . SYSCTL EXTND INITZN done . STATUS -LOCAL SONET . STATUS -LOCAL SONET SITE . STATUS -REMOTE SITE 1 . STATUS -REMOTE SITE 2 . STATUS -REMOTE SITE 3 . STATUS -REMOTE SITE 4 . STATUS -REMOTE SITE 5 . STATUS -REMOTE SITE 6 . STATUS -REMOTE SITE 7 . STATUS -REMOTE SITE 8 "PANEL FAULT" indicates that the User Interface Panel (UIP) has failed and is unable to communicate with the Provisioning Display Controller (PDC). "MN:NE:pdc unavail" indicates that the Provisioning Display Controller (PDC) is unable to communicate with the User Interface Panel (UIP) because it has failed, or because software installation on the PDC is in progress. "UPDATE: In-Progress" indicates that the UPDATE button has been pressed and that an update is in progress. (See "Update button" below.) "UPDATE: done" indicates that an Update has been completed in response to the use of the UPDATE button. "SONET SUBSYS UPDATE done" indicates that an Update has been completed in the SONET subsystem in response to the use of the UPD/INIT button on the SYSCTL. "SYSCTL INITIALIZATION" appears for 10 seconds after a SYSCTL with working software has been inserted. If the UPD/INIT button on the SYSCTL is pressed while this message is displayed, the SYSCTL will reset all SONET parameters to their factory defaults. "SYSCTL EXTENDED INITZN" appears after SYSCTL INITIALIZATION has been completed. "SYSCTL EXTND INITZN done" appears after SYSCTL EXTND INITZN has been completed. "STATUS -LOCAL SONET" indicates the User Interface Panel (UIP) indicators reflect the alarm status of the local system only. The letter "L" is displayed in the SYSCTL 7-segment display. This occurs when the user toggles the Far-End Select (FE SEL) button on the SYSCTL. "STATUS -LOCAL SONET SITE" indicates the User Interface Panel (UIP) indicators reflect the combined alarm status of all the SONET network elements at the local site. The SITE ID and a '.' is displayed in the SYSCTL 7-segment display. This occurs when the user toggles the Far-End Select (FE SEL) button on the SYSCTL. "STATUS -REMOTE SITE x" indicates the User Interface Panel (UIP) indicators reflect the alarm status of REMOTE SITE x. The number "x" is displayed in the SYSCTL 7-segment display. This occurs when the user toggles the Far-End Select (FE SEL) button on the SYSCTL. There are several other miscellaneous buttons on the UIP. The LED Test button lights up all of the LED's to allow quick identification of burnt out LED's. The Alarm Cut Off (ACO) button shuts off the current alarm condition. The Update button operates much like the "Detect New Hardware" icon in Windows95, except that on the SLC-2000 it never locks up your system. Metallic Distribution Shelf (MDS) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The MDS provides control and distribution for Data Service 0 (DS0) and Fiber In The Loop (FITL) interfaces. The following diagram roughly illustrates an MDS shelf assembly in a metallic configuration: +-----------------------------------------------------------------------+ |* AT&T ##== ##== ##== ##== ##== ##== Metallic Distribution Shelf | |-----------------------------------------------------------------------| |~~|~~|~~|~~|~~|~~|~~|~~|~~|~~|~~|~~|~~|~~|~~|~~|~~|~~|~~|~~|~~|~~|~~|~~| | :| :| :| :| :| :| :| :| :| *| *| *| *| *| *| :| :| :| :| :| :| :| :| :| | :| :| :| :| :| :| :| :| :| *| *| | | *| *| :| :| :| :| :| :| :| :| :| |=:|=:|=:|=:|=:|=:|=:|=:|=:| | | | | | |=:|=:|=:|=:|=:|=:|=:|=:|=:| |=:|=:|=:|=:|=:|=:|=:|=:|=:| *| | | | | *|=:|=:|=:|=:|=:|=:|=:|=:|=:| | || || || || || || || || || || || || || || || || || || || || || || || || |!||!||!||!||!||!||!||!||!||!||!||!||!||!||!||!||!||!||!||!||!||!||!||!|| |-----------------------------------------------------------------------| |~~|~~|~~|~~|~~|~~|~~|~~|~~|~~|~~|~~|~~|~~|~~|~~|~~|~~|~~|~~|~~|~~|~~|~~| | :| :| :| :| :| :| :| :| :| *| *| *| *| *| *| :| :| :| :| :| :| :| :| :| | :| :| :| :| :| :| :| :| :| *| *| | | *| *| :| :| :| :| :| :| :| :| :| |=:|=:|=:|=:|=:|=:|=:|=:|=:| | | | | | |=:|=:|=:|=:|=:|=:|=:|=:|=:| |=:|=:|=:|=:|=:|=:|=:|=:|=:| *| | | | | *|=:|=:|=:|=:|=:|=:|=:|=:|=:| | || || || || || || || || || || || || || || || || || || || || || || || || |!||!||!||!||!||!||!||!||!||!||!||!||!||!||!||!||!||!||!||!||!||!||!||!|| +-----------------------------------------------------------------------+ MDS upper and lower shelves are numbered from bottom to top. On the left and right side of each shelf half are 12 channel units (only 9 are pictured in the ASCII diagram). In the middle of each shelf half are the common units. The following diagram roughly illustrates an MDS shelf assembly in a Fiber In The Loop (FITL) configuration: +-----------------------------------------------------------------------+ |* AT&T ##== ##== ##== ##== ##== ##== Metallic Distribution Shelf | |-----------------------------------------------------------------------| |AT&T|AT&T|AT&T|AT&T| |~~|~~|~~|~~|~~|~~|AT&T|AT&T|AT&T|AT&T| | |* |* |* |* | | *| *| *| *| *| *|* |* |* |* | | |* |* |* |* | | *| *| | | *| *|* |* |* |* | | |* |* |* |* | | | | | | | |* |* |* |* | | |* |* |* |* | | *| | | | | *|* |* |* |* | | | || | || | || | || | | || || || || || || || | || | || | || | | | || | || | || | || | |!||!||!||!||!||!|| || | || | || | || | | |-----------------------------------------------------------------------| |AT&T|AT&T|AT&T|AT&T| |~~|~~|~~|~~|~~|~~|AT&T|AT&T|AT&T|AT&T| | |* |* |* |* | | *| *| *| *| *| *|* |* |* |* | | |* |* |* |* | | *| *| | | *| *|* |* |* |* | | |* |* |* |* | | | | | | | |* |* |* |* | | |* |* |* |* | | *| | | | | *|* |* |* |* | | | || | || | || | || | | || || || || || || || | || | || | || | | | || | || | || | || | |!||!||!||!||!||!|| || | || | || | || | | +-----------------------------------------------------------------------+ High Density Fiber Optics Shelf (HDOS) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The HDOS interfaces between the electrical signals on the MDSs and optical signals on the Multi-Services Distant Terminals (MSDTs). The following diagram roughly illustrates an HDOS assembly: +-------------------------------------------------------------------+ |~~|~~|~~|~~|AT&T|~~|~~|~~|~~|AT&T|~~|~~|~~|~~|AT&T|~~|~~|~~|~~|AT&T| |~~|~~|~~|~~| |~~|~~|~~|~~| |~~|~~|~~|~~| |~~|~~|~~|~~| | | | | | | .| | | | | .| | | | | .| | | | | .| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |OU|OU|OU|OU| |OU|OU|OU|OU| |OU|OU|OU|OU| |OU|OU|OU|OU| | | || || || || || || || || || || || || || || || || || || || || | || || || ||PCU|| || || || ||PCU|| || || || ||PCU|| || || || ||PCU|| |-------------------------------------------------------------------+ | ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ | |-------------------------------------------------------------------+ |1 AMP FUSES -------> == == == == == == == == | +-------------------------------------------------------------------+ Note: An HDOS contains 8 Optical Unit (OU) / Power Conversion Unit (PCU) packs, not 4 as shown in the ASCII diagram. Alarm and Test Unit (ATU) ~~~~~~~~~~~~~~~~~~~~~~~~~ The ATU panel reports alarms and trouble indicators using audible alarms, visual indicators, and telemetry. In addition, the ATU provides interfaces to the Pair Gain Test Controller (PGTC) and DC bypass pair connections. An ATU panel looks roughly like this: +---------------------------------------------------------------------+ | | | | | | | | | | * * | | | | | | | | | | | * * | | | | | | | | | | | * * | +---------------------------------------------------------------------+ Here is a close-up of the indicator lights on the far right end of the ATU: +--------------+ | __ __ | Fault ---> | |/ |/ | <-- Critical | | | __ __ | Busy ---> | |/ |/ | <-- Major | | | __ __ | Power Minor ---> | |/ |/ | <- Minor | | +--------------+ Fan Units and Heat Baffles ~~~~~~~~~~~~~~~~~~~~~~~~~~ Fan units are used in RTs to provide cooling, while COTs use heat baffles for the same purpose. The fan unit looks in an RT looks something like this: +-----------------------------------------------------------------------+ |*AT&T .| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | ~* ~~| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |~~ o ~~| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | o ~~| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |~ o ~~| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | .| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |~o | ============= | +-----------------------------------------------------------------------+ A close-up of the far left end of the fan unit looks like this: +------------------------+ | *AT&T o | | +----------+ | | FAULT * | CHANGE | | | | FAN | | |+--------+ SPEED | | ||LED O (10 MIN. | | ||TEST TIMEOUT)| | |+-------------------+ | | 10 - - 212 | | + O 8 - - 176 | | 6 - - 140 | | TEMP 4 - - 104 | | 2 - - 68 | | - O 0 - - 32 | | V F | | C=10 * V | | ESD o | | ORD O | +------------------------+ +-----------------------------+ | Where might you find an RT? | +-----------------------------+ RTs are found in quite an interesting variety of enclosures, including metal and cast concrete. Some are only large enough to hold the RT, while others are environmentally controlled and large enough to hold the equipment and several working technicians. . 44A + 44B Cabinets . WP-91071 Cabinet . 51A cabinet . 80D Cabinet (Community Service Vault) . 80E Cabinet (Community Service Vault) . Mini hut . Maxi hut . Concrete hut . Controlled Environment Vault (CEV) The 44A Cabinet is a wall mounted cabinet that requires a 44B Cabinet to house the powering equipment. WP-91071 Cabinet is a stand alone cabinet. The 51A cabinet is 48" high by 29" wide by 20.5" deep. The 51A cabinet consists of three sections: the front door, the electronics section, and the battery section. The front door is hinged on the left and opens to reveal the electronics section. The electronics section is also hinged on the left, and opens to reveal the battery section. The 80D Cabinet (Community Service Vault). The 80E Cabinet (Community Service Vault). The Mini hut is a prefabricated 6' by 10' by 8' high enclosure. The Maxi hut, also known as the Electronic Equipment Enclosure (EEE) is a prefabricated 10' by 20' by 8' high environmentally controlled enclosure. The Concrete Hut is 13' 2" by 7' 7 and 8' 8.5" high. The walls of the Concrete Hut are made of precast concrete and are 4" thick. The inside of the Concrete Hut is ventilated, heated and air conditioned. The Concrete Hut is protected by intrusion alarms, smoke alarms, and high temperature alarms. The Controlled Environment Vault (CEV) is a precast concrete enclosure designed for installation below ground. The CEV is cast in three parts: the bottom half, the top half, and the entrance hatch. The entrance to a CEV shows a ladder leading down into the enclosure. The CEV is the ultimate in environmental control. In addition to ventilation, heating and optional air conditioning, the CEV also features a gas monitor that senses explosive and toxic gasses, a dehumidifier, and a sump pump. The CEV is lit by four fluorescent lamps backed up by an emergency lamp. The CEV is protected by a gas alarm, a high temperature alarm, a high-humidity alarm, a power-loss alarm, a high-water alarm and an intrusion alarm. +--------------------------------------------------------------+ | Enclosure | Systems | Dual Channel Banks | Lines | |------------------+---------+--------------------+------------+ | 44A+44B Cabinets | 2 | 1 | 192 | | WP-91071 Cabinet | 4 | 2 | 394 | | 51A Cabinet | 2 | 1 | 192 | | 80D Cabinet | 4 | 2 | 384 | | 80E Cabinet | 8 | 4 | 768 | | Concrete Hut | 32(36) | 16(18) | 3072(3456) | | CEV (16') | 40(44) | 20(22) | 3840(4224) | | CEV (24') | 60(78) | 30(39) | 5760(7488) | | EEE | 72(78) | 36(29) | 6912(7488) | +--------------------------------------------------------------+ Note: Number in parenthesis are applicable only to systems using bulk power. +------------------------+ | SLC Interface Software | +------------------------+ +--------------+ | SLC Glossary | +--------------+ A&M Addition and Maintenance ACO Alarm Cut Off ACU Alarm Control Unit ACXT Apparatus Case Crosstalk ADPCM Adaptive Differential Pulse Code Modulation ADU Alarm Display Unit AIU Alarm Interface Unit ALBO Automatic Line Build Out ALC Automatic Loss Compensation ALIT Automatic Line Insulation Test AMD Alphanumeric Message Display ANI Automatic Number Identification ASN Abstract Syntax Notation ASU Alarm Suppressor Unit ATU Alarm and Test Unit AWC Average Worst Case B-E Both-Ends B8ZS Bipolar with 8 Zero Substitution BCU Bank Controller Unit BFU Bank Fuse Unit BIU Backplane Interface Unit, Bank Interface Unit BMP Bandwidth Management Processor CAU Craft Access Unit, Channel Access Unit CCITT International Telephone and Telegraph Consultative Committee CCS Hundred Call Seconds CDO Community Dial Office CDS Circuit Design System CENTREX Central Office Exchange Service CEV Controlled Environment Vault CFU Channel Fuse Unit CIMAP Circuit Installation and Maintenance Package CIR Customer Information Release CIT Craft Interface Terminal CIU Craft Interface Unit CLC Common Language Coordinator CLEI Common Language Equipment Identification CLF Carrier Line Failure CLLI Common Language Location Identification CLRC Circuit Layout Record Card CMC Construction Management Center CMIS Common Management Information System CND Calling Number Delivery CO Central Office COACH Customized On-line Aid for Customer Help CODEC Coder/Decoder COE Central Office Engineer COT Central Office Terminal CP Circuit Pack CPC Circuit Provisioning Center CPI Circuit Party Identification CRC Cyclic Redundancy Check, Circuit Redundancy Code CSA Carrier Serving Area CSC Community Service Cabinet CSDC Circuit Switched Digital Capability CSPEC Common Systems Planning and Engineering Center CSS Controlled Slip Second CTB Cut Through Board CTU Channel Test Unit CU Channel Unit CUE Channel Unit Emulator CV Coding Violation CWG Construction Work Group CZ Carrier Zone DA Distribution Area DACS Digital Access Cross-connect System DCC Data Communications Channel DCLU Digital Carrier Line Unit DCU Digital Connectivity Units DDF Digital Digroup Formatter DDS Digital Data Service DF Distributing Frame DFI Digital Facilities Interface DID Direct Inward Dial DILEP Digital Line Engineering Program DLC Digital Loop Carrier DLI Data Link Interface DLP Detailed Level Procedure DLR Design Layout Record DLS Digital Line Schematic DLU Data Link Unit DM Degraded Minute DPO Dial Pulse Originating DPT Dial Pulse Terminating DPX DATAPATH Extension DR Demand Repeater DS0 Digital Signal 0, Data Service 0 DS0DP Digital Signal 0 Dataport DS1 Digital Signal 1 (1.544 MB/s) DSDC Distribution Services Design Center DSL Digital Subscriber Line DSNE Directory Services Network Element DSPC Distribution Services Planning Center DST Digital Signal Translator DSU Data Service Unit DSX Digital Service Cross-connect DT Distant Terminal DTU Digital Test Unit E Ear EASOP Economic Alternative Selection for Outside Plant ECCR Exchange Customer Cable Record EEC Electronic Equipment Enclosure EEC Equipment Engineering Center EFPA Enhanced Feature Package A EFPB Enhanced Feature Package B EFPC Enhanced Feature Package C EFPD Enhanced Feature Package D EFRAP Exchange Feeder Route Analysis Program EJO Engineering Job Order ELIU Electrical Line Interface Unit EMO Expected Measured Loss EOC Embedded Operations Channel ES Errored Seconds ESD ElectroStatic Discharge ESF Extended Super Frame ESPORTS Extended Super POTS EWC Extreme Worst Case EWO Engineering Work Order FA Feeder Administration FAC Facility Assignment and Control Center FACS Facility Assignment and Control System FAP Facility Analysis Plan FCS Frame Checking Sequence FCU Fan Control Unit FDI Feeder Distribution Interface FDL Facility Data Link FE Far End FELP Far End LooP FEMF Foreign Potential FEXT Far End Crosstalk FITL Fiber In The Loop FL Fault Locating FLTA Fault Locate Test Adapter FPA Feature Package A FPB Feature Package B FPC Feature Package C FPD Feature Package D FPS Framing Pattern Sequence FSM Fiber Service Module FSR Frequency Selective Ringing FSS Fiber Service Shelf FTTH Fiber To The Home FX Foreign Exchange FXO Foreign Exchange Office FXS Foreign Exchange Station GNE Gateway Network Element GS Ground Start HDIC High Density Interconnect HDOS High Density Optics Shelf HDT Host Digital Terminal HTR Heater IBN Integrated Business Network IDCU Integrated Digital Carrier Unit IDF Intermediate Distributing Frame INA Integrated Network Access IOP Input/Output Processor ISD Isolation Diagram ISDN Integrated Services Digital Network ISLU Integrated Services Line Unit ITH Integral Test Head LAC Loop Assignment Center LAN Link to Alarm and Networks LBO Line Build Out LBRV Low Bit Rate Voice LCRIS Loop Cable Record Inventory System LDS Local Digital Switch LDU Load Distribution Unit LEC Loop Electronic Coordinator LED Light Emitting Diode LFACS Loop Facility Assignment and Control System LFC Line Feeder Converter LFU Line Fuse Unit LIC Lightguide Interconnect Cable LIT Line Insulation Test LIU Line Interface Unit LM Loop Multiplexer LMOS Loop Maintenance Operating System LOF Loss Of Frame LOS Loss Of Second LP Low Power LRAP Long Route Analysis Program LRD Long Route Design LROPP Long Range Outside Plant Plan LRT Local Remote Terminal LS Loop Start LSI Line Side In LSO Line Side Out LSS Loop Switching System LSU Line Switching Unit LT Line Terminal LTC Local Test Cabinet LTD Local Test Desk M Mouth MC Maintenance Center MCC Master Control Center MD Manufacture Discontinued MDF Main Distributing Frame MDS Metallic Distribution Shelf MH Man Hole MIU Metallic Interface Unit, Maintenance Interface Unit MJ Major MLT Mechanized Loop Testing MM Material Management MN Minor MPP Miscellaneous Pair Panel MR Meter Reading MSDT Multi-Services Distant Terminal MTS Message Telephone Service MVEC Majority Vote Error Correction MWC Maintenance Work Center MWG Maintenance Work Group MWI Message Waiting Indication MXU Multiplexer Unit NAB Network Alarm Bus NAIU Network Access Interface Unit NCTE Network Channel Terminating Equipment NE Near End NEXT Near End Crosstalk NIDB Network Interface Data Bus NIU Network Interface Unit NM New Manhole NMA Network Monitoring and Analysis NPA Numbering Plan Area NT Network Termination NTEC Network Terminal Equipment Center NTP Non Trouble-Clearing Procedure OCU Office Channel Unit OCUDP Office Channel Unit Dataport OHCTL Overhead Controller OHT On-hook Transmission OIC Optical Interconnect OIU Office Interface Unit OLIU Optical Line Interface Unit ONI Operator Number Identification ONU Optical Network Unit OOS Out Of Service OPE Outside Plant Engineer OPS Off Premise Station OPS/INE Operations System/Intelligent Network Element ORB Office Repeater Bay OSP Outside Plant OSPE Outside Plant Engineer OTU Office Timing Unit OU Optical Units OW Order Wire PAM Pulse Amplitude Modulation PAU Power Amplifier Unit PBX Private Branch Exchange PCM Pulse Code Modulation PCU Power Converter Unit PDC Provisioning Display Controller PG Pair Gain PGD Pair Group Display PGP Pair Group Planning PGS Pair Gain System PGTC Pair Gain Test Controller PIC Polyethylene Insulated Conductor PICS Plug-in Inventory Control System PMN Power Minor PMO Present Mode of Operation POTS Plain Old Telephone Service PRU Positive Ringing Unit PTAB Port Test Alarm Bus PU Power Unit PWB Printed Wiring Board R&R Remove and Reinstall RCU Ring Control Unit RCVG Receiving RDES Remote Data Entry System REN Ringer Equivalency Number RLS Repeater Location Schematic RMU Remote Measurement Unit, Remote Maintenance Unit ROS Remote Operations Service RPFT Remote Power Feed Terminal RSB Repair Service Bureau RSM Remote Switching Module RT Remote Terminal RTS Remote Test System RTU Remote Test Unit RZ Resistance Zone S&E Service and Equipment S-E Signal-End S/I Signal to Interference S/N Signal to Noise S1DN Stage One Distributing Network S1DP Stage One Distributing Panel SAI Serving Area Interface SARTS Switched Access Remote Testing System SB Signal Battery SCC Switching Control Center SCCS Switching Control Center System SCEC Secondary Channel Error Correction SDDF Subscriber Digital Distributing Frame SDFI Subscriber Digital Facility Interface SDH Synchronous Digital Hierarchy SDX Subscriber Digital Crossconnect SEFS Severely Errored Framing Second SES Severely Errored Seconds SF Super Frame SFIU Switching Facility Interface Unit SG Signal Ground SID System IDentification SLC Subscriber Loop Carrier SLIM Subscriber Line Interface Module SM Switching Module SMAS Switched Maintenance Access System SMU System Memory Unit SO Service Order SONET Synchronous Optical Network SP Standard Power, Special Protection SPGM Suburban Pair Gain Planning SPGPM Suburban Pair Gain Planning Method SPOTS Special Plain Old Telephone Service SPR Superimposed Ringing SPTS Signaling Path Test Set SSC Special Service Center SSP Special Service Protection SSU Special Service Unit STIU Switching Transmission Interface Unit STM Span Terminating Module STS Synchronous Transport Signal SXS Step-by-Step SYSCTL System Controller T-BRITE T-Basic Rate Interface Transmission Extension TAD Trouble Analysis Data TAP Trouble Analysis Procedure TASC Telecommunications Alarm Surveillance Control System TASX Telecommunications Alarm Surveillance and Control System TAU Time Assignment Unit TBCU Test Bus Control Unit TBOS Telemetry Byte-Oriented Serial TCU TransCoder Unit TD Toll Diversion TDM Tandem TFD Trunk Distributing Frame TFIU Transmission Facility Interface Unit TGS Synchronous Timing Generator THC Test Head Controller TIRKS Trunk Inventory and Record Keeping System TLWS Trunk Line Work Station TMC Time slot Management Channel TMT Transmission Maintenance Terminal TNO The New Order TNOP Total Network Operating Plan TO Transmission Only TOC Task Oriented Costing TOP Task Oriented Procedure TPI Tip Party Identification TRMTG Transmitting TRU Transmit/Receive Unit TSI Time Slot Interchange TSU Transmission Signaling Unit UAS UnAvailable Second UIP User Interface Panel UL Underwriters Laboratory UNICCAP Universal Cable Circuit Analysis Program USDL U-interface Digital Subscriber Line VF Voice Frequency VRT Virtual Remote Terminal VT Virtual Tributary VTU Virtual Tributary Unit WATS Wide Area Telephone Service WC Wire Center WCPC Wire Center Planning Center WES Warranty Eligibility System WORD Work Order Record Details XADU eXtended Alarm Display Unit XTC eXtended Test Controller ZCS Zero Code Suppression +-------------+ | SLC Vendors | +-------------+ AT&T 12450 Fair Lakes Cir Ste 302 Fairfax, VA 22033 Phone: (703) 802-3853 Fax: (703) 802-3853 +----------------------------------------------------------+ | | SLC-5 | SLC-2000 | +----------------------------------------------------------+ | Maximum No. Subscriber Ports | 192 | 768 | | Remote Terminal (qty. per 7-ft. size) | 3 | 1 | | Remote Inventory and Diagnostics | Y | Y | | Identical Plug-ins for RT and COT | Y | Y | | Max. DS1 Span Lines Supported | 24 | 28 | | Max. DS1 Span Lines Powered/Protected | 24 | 28 | | Integrated DS-3 Interface | N | N | | Integrated Sonet Interface | | OC-3 | | TR-008 Compatible Mode | Y | Y | | TR-303 Compatible Mode | Y | Y | +----------------------------------------------------------+ Fujitsu Network Communications Inc 2801 Telecom Parkway Richardson, TX 75082 Phone: (800) 777-3278 Fax: (214) 479-6990 +------------------------------------------------------+ | | FDLC | FACTR | +------------------------------------------------------+ | Maximum No. Subscriber Ports | 192 | 1920 | | Remote Terminal (qty. per 7-ft. size) | 4 | 5 | | Remote Inventory and Diagnostics | Y | Y | | Identical Plug-ins for RT and COT | Y | Y | | Max. DS1 Span Lines Supported | 8 | 28 | | Max. DS1 Span Lines Powered/Protected | 0 | 0 | | Integrated DS-3 Interface | N | N | | Integrated Sonet Interface | N | Y | | TR-008 Compatible Mode | Y | Y | | TR-303 Compatible Mode | N | Y | +------------------------------------------------------+ NEC America Inc 14040 Park Center Rd Herndon, VA 22071 Phone: (703) 834-4000 Fax: (703) 834-4306 +-------------------------------------------------+ | | ISC-303 | +-------------------------------------------------+ | Maximum No. Subscriber Ports | 192 | | Remote Terminal (qty. per 7-ft. size) | 10 | | Remote Inventory and Diagnostics | Y | | Identical Plug-ins for RT and COT | Y | | Max. DS1 Span Lines Supported | 5 | | Max. DS1 Span Lines Powered/Protected | 0 | | Integrated DS-3 Interface | N | | Integrated Sonet Interface | | | TR-008 Compatible Mode | Y | | TR-303 Compatible Mode | Y | +-------------------------------------------------+ Northern Telecom, Inc. Northern Telecom Limited 8220 Dixie Road Suite 100 Brampton, Ontario L6T 5P6 Canada Phone: (905)863-0000 Phone: (800)4-NORTEL +-------------------------------------------------------------------+ | | DMS-1 Urban | Access Node | +-------------------------------------------------------------------+ | Maximum No. Subscriber Ports | 544 | 672 | | Remote Terminal (qty. per 7-ft. size) | 0 | 1 | | Remote Inventory and Diagnostics | Y | Y | | Identical Plug-ins for RT and COT | Y | Y | | Max. DS1 Span Lines Supported | 8 | 28 | | Max. DS1 Span Lines Powered/Protected | 8 | 0 | | Integrated DS-3 Interface | N | Y | | Integrated Sonet Interface | N | Y | | TR-008 Compatible Mode | Y | Y | | TR-303 Compatible Mode | N | Y | +-------------------------------------------------------------------+ RELTEC Corp 5875 Landerbrook Dr Cleveland, OH 44124 Phone: (216)460-3600 Fax: (216)460-3690 +----------------------------------------------------------------------------+ | | DISCS 1 | Sonet DISCS | DISCS FITL | +----------------------------------------------------------------------------+ | Maximum No. Subscriber Ports | 672 | 2016 | 0 | | Remote Terminal (qty. per 7-ft. size) | 672 | 672 | 672 | | Remote Inventory and Diagnostics | Y | Y | Y | | Identical Plug-ins for RT and COT | Y | Y | Y | | Max. DS1 Span Lines Supported | 28 | 84 | 84 | | Max. DS1 Span Lines Powered/Protected | 0 | 0 | 0 | | Integrated DS-3 Interface | N | N | N | | Integrated Sonet Interface | N | Y | Y | | TR-008 Compatible Mode | Y | Y | Y | | TR-303 Compatible Mode | Y | Y | Y | +----------------------------------------------------------------------------+ Siescor Technologies, Inc. (A division of Raytheon) Box 470580 Tulsa, OK 74147-0580 Phone: (918)252-1578 Fax: (918)252-2757 E-Mail: seiscor@raytheon.com +-----------------------------------------------------------------------+ | | FiberTraq | S-24DU | RLC-1920 | +-----------------------------------------------------------------------+ | Maximum No. Subscriber Ports | | | 1920 | | Remote Terminal (qty. per 7-ft. size) | | | | | Remote Inventory and Diagnostics | | | | | Identical Plug-ins for RT and COT | | | | | Max. DS1 Span Lines Supported | | | | | Max. DS1 Span Lines Powered/Protected | | | | | Integrated DS-3 Interface | | | | | Integrated Sonet Interface | | | | | TR-008 Compatible Mode | | | | | TR-303 Compatible Mode | | | | +-----------------------------------------------------------------------+ ----[ EOF