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- The LOD Technical Journal: File #5 of 12
-
- =/=/=/=/=/=/=/=/=/=/=/=/=/=/=
- Maintenance
- for DMS-100
- Written by -
- -/- Unequal Access -/-
-
- .Introduction
-
- In order to maintain Northern Telecom's (NT) DMS-100 Digital Switch an
- advanced menu driven man-machine interface (MMI) is used. It is comprised of
- a Visual Display Unit (VDU) which is part of the Maintenance and
- Administrative Position (MAP) interface. I'm going to outline how it deals
- with maintenance, alarms, and administration. A quick example of how it
- handles line and trunk trouble reports and the addition of a new subscriber
- will be given.
-
- .Maintenance and Administrative Position (MAP)
-
- Hardware
- The MAP is the primary interface between the technician and the DMS-100
- family of switches. The main hardware components of the MAP are:
-
- 1. Visual Display Unit (VDU) - the MAP terminal
- 2. Alarm Panel - sends an alarm to the VDU.
- 3. Communications Module - (telephone) to speak with the subscriber voice
- 4. Test jacks
-
- .Remote MAP
- Since all line and trunk test equipment is an integral part of the DMS-100,
- no loss in accuracy results when the MAP is remote. Every switch has its own
- dialup as well. Meaning this is not a theoretical file, you will be able to
- dial up DMS-100 and perform switch maintenance!
-
- Maintenance
- A sophisticated MMI through the MAP terminal is used, to allow a technician
- to maintain the switch and keep informed of switch operations. Maintenance of
- a DMS-100 digital switch is made up of:
- 1. Manually requested maintenance
- 2. Scheduled maintenance
- 3. Automatic maintenance after the detection of faults
-
- Alarms
- The system maintains alarms for the more critical areas of the switch, ie.
- the central controller. A real-time display of the alarms gives the
- technician constant status reports.
-
- Administration
- A Table Editor allows the technician to add new lines or trunks. A Service
- Order facility allows features such as hunt groups and Multiple Address
- Directory Numbers (MADN) to be added.
-
- .Maintenance
- A common use of line maintenance is in resolving a customer type trouble
- report. The technician selects the Line Test Position (LTP) option and the
- selected line is flagged for action by an identifier (ie. directory number,
- physical location number). The line status information, ie. line state and
- terminating director number is constantly sent to the MAP terminal by
- DMS-100.
-
- A functional test of the subscriber's dedicated line card is invoked by
- DIAGNose. Test equipment measures performance of the line card and reports
- deviations from defined levels. Here is what a LTP with line diagnostic
- results appears as on the terminal:
-
- CC CMC IOD Net PM CCS LNS Trks Ext
- FDIAG 10 GC
- M "C"
-
- LTP POST DELQ BUSYQ PREFIX
- 0 Quit-
- 2 Post-
- 3 LCC PPTY RNG ... LEN ... DN STAFS LTA TE RESULT
- 4 LTPMAN IBN PSET HOST 02 1 12 30 772 5016 IDL
- 5 Busy-
- 6 RTS-
- 7 Diagn- HOLD1 722 7861 IDL
- 8 TstRing HOLD2 722 7862 CPB7227782
- 9 Almstat- HOLD3 722 7861 IDL D
- 10 CktLoc Diagn
- 11 Hold
- 12 NextH- LEN HOST 01 1 12 30 DN 7225016
- 13 NextP- DIAGNOSTIC RESULT Card diagnostic OK
- 14 IBNCON ACTION REQUIRED:None
- 15 CSDDS CARD TYPE 6X21AA
- 16 LTPLTA
- 17 LCO-
- 18 Prefix-
- F
- Time XX:XX
-
- Legend: The first line CC CMC... represents the various maintenance
- subsystem headers.
- The second line FDIAG 10GC represents a minor alarm condition for
- line facility diagnostics and a critical alarm condition for 10 trunk
- groups.
- Alarm status is given in the third line.
-
- Scheduled Line Testing
- Full testing of a subscriber loop may be performed using MAP's Line Test
- Position Line Test Access (LTPLTA). Internal line test equipment (LTU) in DMS
- will be physically connected to a subscriber loop with the Metallic Test
- Access Bus (MTA). Here's what the results of a manually requested line
- insulation test appear as:
-
- CC CMC IOD Net PM CCS LNS Trks Ext
- Clk #0 1 LGC 2 GC 2Crit
- M M CR C "C" "C"
-
- LTPLTA POST DELQ BUSYQ PREFIX
- 0 Quit-
- 2 Post- LCC PPTY RNG ... LEN ... DN STAFS LTA TE RESULT
- 3 MonLTA-
- 4 TalkLTA- 1FR HOST 00 27 621 1234 IDL
- 5 Orig-
- 6 Lnst-
- 7 Vdc-
- 8 Vac-
- 9 Res-
- 10 Cap- LnTST
- 11 Hold TEST OK
- 12 NextH- RES CAP VAC VDC
- 13 NextP-
- 14 LTA TIP 999..K 0.05OUF 0 0
- 15 BalNet
- 16 Coin- RING 999..K 0.05OUF 0
- 17 Ring-
- 18 DgtTst TIP TO RING 999..K 0.57OUF
- GAT2
- Time XX:XX
-
- Using this command the source of a fault and whether its on the subscriber
- end or not can be determined. This test is usually run during off-peak hours,
- using MAP's Automatic Line Test (ALT) and the Automatic Line Insulation Test
- (ALIT).
-
- System Line Initiated Line Testing
- When call processing detects faulty lines they are automatically scheduled to
- be diagnosed in queue. The outcome is given to MAP, and a record is printed
- in an office log.
-
- Trunk Maintenance
- Executes checking, testing, monitoring, status monitoring and verifying
- functions to make sure trunks are working right. It also provides a means of
- quick troubleshooting when a trunk problem occurs, using the telescoping
- process to pinpoint the problem location. An example of a Centralized
- Automatic Message Accounting 2-Way (CAMA2W) Trunk is given here:
-
- CC CMC IOD Net PM CCS LNS Trks Ext
- 10 GC
- "C"
-
- TTP
- 0 Quit- POST DELQ BUSYQ DIG
- 2 Post- TTP 5
- 3 Seize- CKT TYPE PM NO. COM LANG STASR DOT TE RESULT
- 4 2WY DP MF TMB 424 CAMA2W 1 IDL
- 5 Bsy-
- 6 RST-
- 7 Tst-
- 8
- 9
- 10 CktLoc Tst
- 11 Hold TEST OK
- 12 Next- + TRK107 DEC02 14:41:31 8700 PASS CKT CAMA2W 1
- 13 Rls
- 14 Ckt-
- 15 Tms1Vf-
- 16 StkSdr-
- 17 Pads-
- 18 Level-
- C
- Time XX:XX
-
- A technician can choose to conduct trunk testing manually from the Trunk Test
- Position (TTP) or automatically from the Automatic Trunk Testing (ATT) level
- of the MAP.
-
- .Alarms
- Are reported at three levels according to their degree of urgency. In order
- of urgency they are Critical, Major and Minor. Alarm thresholds are defined
- by an administrator. ie. the percentage of a trunk group that is out of
- service before a minor alarm is sent. Audible and visible indicators can be
- used locally, in another part of the building or in a remote monitoring
- center.
-
- .Administration
-
- The Table Editor
- Consists of a set of commands that will create or change data. The tables and
- Table editor is part of the DMS-100's database software. Control is done at
- the MAP.
-
- An example of a new trunk addition to an existing trunk group would be:
-
- >table trkmem /* TABLE Trunk Member
- TABLE TRKMEM:
- >add otdp1 1 /*Outgoing Trunk Digit Pulse
- /*Element 1
- SGRP:
- >0 /*Subgroup Number
- PMTYPE /*Peripheral Module Type
- >tm 8 /*Trunk Module Type 8
- TMNO: /*Trunk Module Number
- >0
- TMCKTNO: /*Trunk Module Circuit Number
- >8
- TUPLE TO BE ADDED:
- OTDP 1 0 TM8 0 8
- ENTER Y TO CONFIRM, N TO REJECT OR E TO EDIT
- >y
- TUPLE ADDED
- (input MUST be in lower case)
-
- RANGE will give you a list of legal and advised inputs:
-
- >range
- 1 CLLI COMMON_LANGUAGE_NAME
- 2 EXTRKNUM EXTERNAL_TRUNK_NAME
- 3 SGRP TRUNK_SUBGROUP_NUMBER
- 4 MEMVAR MEM_VAR_AREA
-
- LOGICAL TUPLE TYPE: L_TRUNK_MEMBER
-
- >range 3
- 3 SGRP TRUNK_SUBGROUP_NUMBER
- TYPE TRUNK_SUBGROUP_NUMBER {0 TO 1}
-
- Service Orders
- Are used to:
- - add/remove subscriber service from lines
- - add/remove services such as touchtone
- - change Line Equipment Numbers (LEN) or the Directory Numbers (DN) of lines
-
- Here's an example of how you can setup a New Single Party Flat Rate (1FR)
- with options. In this case the new line will be POTS with touchtone (referred
- to as dgt). The new line is part of line treatment group 1. The phone number
- or directory number is 555-1212. The line equipment number is 10 1 12 26
- (frame 10, unit 1, drawer 14, card 26)
-
- Input in prompt mode:
-
- >SERVORD
- SO:
- >new
- SONUMBER: NOW 85 12 02 AM
- > /* Directory Number
- >5551212
- LCC: /* Line Class Code
- 1fr /* Single Party Flat Rate
- LTG: /* Line Treatment Group
- >1
- LEN: /* Line Equipment Number
- >10 1 14 26 /* Frame 10, unit 1, drawer 14, card 26
- OPTION: /* Subscriber Option
- >dgt /* Digitone Dialing
- OPTION:
- >$
- COMMAND AS ENTERED
- NEW NOW 85 12 02 AM 5551212 1FR 1 10 1 14 26 DGT $ ENTER Y TO CONFIRM, N TO
- REJECT OR E TO EDIT
- >y
-
- Input in no-prompt mode:
- >new $ 5551212 1fr 1 10 1 14 26 dgt $
- COMMAND AS ENTERED
- NEW NOW 85... etc.
- >y
-
- Here is another example of how to install a new Electronic Business Set (EBS)
- with DN 800-555-1212 and LEN 2 0 1. The option Special Billing (SPB) is used
- with special billing DN 555-0000.
-
- Input in prompt mode:
-
- >SO:
- >new
- SONUMBER: NOW 85 12 02 AM
- >
- DN_OR_LEN: /* DN or LEN
- >5551212
- LCC: /* Line Class Code
- >pset /* Proprietary Set (EBS)
- GROUP /* Customer Group
- >custname
- SUBGRP: /* Sub Group
- >4
- NCOS: /* Network Class of Service
- >10
- SNPA: /* Subscriber Numbering Plan Area
- >800
- KEY: /* Key Number of EBS
- >1
- RINGING: /* Audible ringing?
- >y
- LEN:
- > 2 0 1
- OPTKEY: /* Option on key
- >1 /* EBS key number
- OPTION:
- >spb /* Special Billing
- SPBDN: /* Special Billing Directory Number
- >5550000
- OPTKEY:
- >$
-
- That is the maintenance interface of DMS-100. If you are under the system, or
- any other DMSs for that matter go searching for its dialup number. As you can
- tell, there is no end to the things you can configure with it. Such as giving
- yourself "special billing" or no billing whatsoever. You can also edit
- numbers in different NPAs so a dialup in another NPA would suffice.
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