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- ==Phrack Inc.==
-
- Volume Two, Issue 12, Phile #6 of 11
-
- /\ /\
- <[]>==========================================<[]>
- \/ ^ ^ \/
- || PLP [+]The Executioner[+] PLP ||
- ++ ^ ^ ++
- || [+] PhoneLine Phantoms! [+] ||
- ++ ++
- || CSDC - Hardware Requirements ||
- ++ ----------------------------- ++
- || PLP | PHRACK XII - PHRACK XII | PLP ||
- /\ ----------------------------- /\
- <[]>==========================================<[]>
- \/ Phreak Klass Room 2600 = 806-799-0016 \/
- || _______________ Login: Educate ||
- ++ |The only BBS | Sysop:Egyptian Lover ++
- || |that teaches.| Cosysop:The Executioner||
- /\ --------------- Board lose:Oryan Quest /\
- <[]>==========================================<[]>
- \/ \/
-
- Preface:
- ========
-
- This is the second part of my CSDC (Circuit Switched Digital Capability)
- series, the first being in PHRACK X. It is suggested that you read the first
- part and also the file on PACT in PHRACK XI. If I feel the material was not
- covered completely, I will make a third addition to this file.
-
-
- Hardware Interfaces
- ===================
-
- A NCTE or equivalent network interface equipment, located on the customer
- premises, is required to provide the CSDC feature for a customer. The NCTE or
- an equivalent circuit, located on the customer's premises, is required to
- provide TCM (Time-Compression-Multiplexing) transmission on the 2-wire
- subscriber loop. The NCTE also has a remote loopback for testing from CSDC
- central office.
- Dedicated 2-way CSDC trunk circuits are provided via DCT (Digital Carrier
- Trunk) combined alternate data/voice (CADV) units with DCT supervision. MF and
- CCIS signalling is allowed on these trunks. They provide signalling, switching
- and trunking functions between 1A ESS switch and other CSDC offices. To
- provide CSDC, the DCT bank must be equipped with alarm and digroup control
- units. A Digital Office Timing Supply (DOTS) is needed to provide network
- synchronization for the CSDC feature. A minimum of 3 CSDC maintenance circuits
- are needed for the CSDC feature to operate. The circuit provides digital
- signals for testing CSDC trunks and loops. They also provide a test
- termination for incoming CSDC calls. If an office has superimposed ringing for
- 4 and 8 party lines, these ringing circuits may be used for loop testing with
- the maintenance circuit.
-
- Remote Switching System
- =======================
- The RSS remote frame contains eight special service slot positions that can be
- used for D4 type plug in units (basically allows the RSS to have CSDC
- abilities). This allows the CSDC TRXS (Time Compression Multiplexing Remote
- Subscriber Exchange) channel units to be housed in the RSS frame. The CSDC
- feature is provided via the RSS T1 carrier facilities. The T1 carriers for
- CSDC service terminate with position 1 and 0 at the RSS. A ringing and tone
- plant is required in the RSS office to ring the phones of special service
- channel unit subscribers.
-
-
- Operation of the CSDC
- =====================
-
- An off-hook origination initiates the seizure of an originating register.
- A line translation is performed and the CSDC indicator is received from the
- Line Equipment Number Class (LENCL) and is stored in the register. A touch
- tone service receiver is connected to the line and dial tone is applied. Upon
- receiving a digit, dial tone is removed. If the first digit is a '#', digit
- collection is set up to collect 2 more digits. Upon receipt of the 2 digits
- (99), the PACT (Prefix Access Code Translator) is indexed via the dialed
- digits to determine what service has been requested. If the line cannot have
- CSDC, an error message is sent. The AB digits (carrier selection) are
- collected next. Once the AB digits have been determined to be valid, the CCOL
- (Chart Column) is received. The CCOL merely is a code to tell the PACT what is
- to be done. Once the AB digits and the CSDC CCOL is received, the original
- register is overwritten with the CSDC CCOL. The CSDC office then sends a bit
- down the line to tell the equipment that a CSDC call is being processed.
- The call is now reinitialized to appear as though no digits have been
- collected. Digit collection proceeds until the proper number of digits (7 to
- 10) has been received. An AMA register is seized at the end of the dialing.
- The call is then routed according to the dialed digits on a CSDC outgoing
- trunk. Answer guard timing for CSDC calls is 800 ms. Upon answer, the answer
- time is recorded in the AMA register.
- An outpulsing trunk is seized and a POB is hunted. If an outgoing trunk
- and outpulsing device are needed, one will be hunted. Information on the trunk
- is stored and a transfer to the outpulsing routine (MF or CCIS) is done. A
- verification insures that both calling and called parties are CSDC allowed. If
- they are not, the call is routed to an Automatic Intercept Service (AIS).
- For MF outpulsing, a junior register is seized, the outgoing trunk is put
- into the proper states, and start pulsing signal detection is done followed by
- digit outpulsing. For CCIS, call processing is the same as a normal call but a
- CCIS continuity check is performed while on the on-hook state.
- For an incoming call, the CSDC bit from the Trunk Class Code (TCC) is
- stored in the incoming register and a CSDC count is pegged. Digit collection
- is performed and a terminating DN translation is performed. Ringing is applied
- normally and once it has been answered, the incoming trunk is put in the
- off-hook state to pass answer to the next office.
- Standard disconnect and trunk guard timing is performed on CSDC calls
- when the called or calling party goes off-hook after a talking path has been
- established.
-
-
- Standard CSDC Dynamics
- ======================
-
- Call forwarding codes dialed after the CSDC code result in reorder.
-
- The Call waiting option is also suspended when a CSDC call is in progress.
- Busy tone is given to POTS call that terminates to a CSDC connection. Busy
- tone is also given to a calling CSDC party if it encounters a busy line.
-
- In order to have a 800 CSDC feature, the office must have CCIS INWATS ability
- in the OSO (Originating Screening Office).
-
- Dialing 911 after the CSDC code is allowed, but 411/611 calls are routed to
- error messages.
-
-
- NCTE (Network Channel Terminating Equipment)
- ============================================
-
- As covered in Part 1, the NCTE is the equipment that you need to have CSDC.
- The NCTE is a piece of hardware that is connected to the CO loop and a
- terminal. On the terminal, there are 8 jacks for 8 pins on the NCTE. The
- functions of each pin are as followed.
-
- 1 - TRANSMISSION DATA
- 2 - TRANSMISSION DATA
- 3 - MODE CONTROL
- 4 - MODE CONTROL
- 5 - TIP VOICE
- 6 - RING VOICE
- 7 - RECEIVED DATA
- 8 - RECEIVED DATA
-
- ==============================================================================
-
-
- This ends PART II of the CSDC series. Since Taran King was in such a hurry, I
- will finish the 3rd file with SCCS integrations, loop structure and RSS
- structures.
-
- If you have any questions about this file or any other file, please leave me a
- message on either...
-
- Phreak KlassRoom 2600 = 806-799-0016 LOGIN:EDUCATE
-
- My Voice Mail Box = 214-733-5283
- ===============================================================================
-
-