Glossary - Abbrevations and Descriptions 1.0 ^ By Inferno and Sire 1996..

To Contact The Med Call The Med Whq cORRUPTiON On +44 NOT-4-YA

The following is a list of abbrevations and their descriptions, the file is not finished in any respects and I shall be updating it in the future.. at the moment, in only deals with the System X switch (`SYS-X') because i don`t have enough infomation on AXE10 to compile much about that.

AAR Automatic Alternative Routing. AAS S-X Automatic Announcment Subsystem. Not used in trunk exchanges because it is done by the SIS in a trunk exchange. In a local exchange it provides the recorded announcements (`Voice Guidance') whilst the DS3 provides the tones. ACP Access Control Pair. AEQ Automatic Announcement Equiptment. AIR Alarm Interface Controller AJG Analogue Junctions Group. ALE Analogue Local Exchange APT Alarm Port. ARAB TXE Alarm Reset And Busy ARR Automatic Re-Routing. ARU TXE Alarm Reporting Unit ASU Advanced Services Unit - FNET (Feature Net). ATE Automatic Telephone Exchange. AUS S-X Access Utility Subsystem. AXS Auxiliary Supervisor
CAB Cable Box, the green things at the end of each road.. with everyone's lines in. CAS S-X Call Accounting Subsystem. Uses the caller infomation to charge the subscriber for a call and then increments the callers record table. (the record table is a software version of the subscribers meter) CPS S-X Call Processing Subsystem CCR Concentrator. CCS Call Connect System. CCU Colocated Concentrator Unit. CCR Concentrator CCX Concentrator Extra Parameter CNI Calling Number Interception. COMFORTE COMputers FOR Telephone Exchanges. COW Clerk Of Work CPS S-X Call Processing Subsystem. The functions of the CPS in the local exchange is the same as it would be on a trunk exchange. It has overall control over any call. It registers the state of line from the subscriber (busy/free etc..), Stores class of Service (0out going barred, incoming barred etc..), controls the star facilities, controls time outs and communicates with other software such as the call accounting subsystem. CSB Central Site Processor CSO Contract Supervising Officer. CSO Centralized Service Observation CSS Customer Services And Systems. CUG Closed User Group.

DAM S-X Alarm Monitor
DCD Data Compiler/Decompiler.
DCD LOOP The process of Decompiling data and feeding the output in as the

input to the compiler.
DCCE S-X Digital Cell Center. This is an exchange that :

  1. Provides service to its own customers and act as parent for RCUs.
  2. Act as a parent for analogue exchanges, terminating analogue line plant and performing call charge as required.
  3. Concentrate and foward traffic to the DMSU for parented Analogue Local Exchanges (ALE) without their own DMSU links.
  4. Switch Tandem Traffic Between other DLSUs. DDC District Data Center DDT Digital Line Termination DDSN Digitally Derived Services Network. (0800, 0891 etc...) DJSU S-X Digital Junction Switching Unit. This is a switching unit in a

    high telephone density local network which performs a tandem switching function, but has no customer connections. DLS S-X Digital Local Switching Unit. General term for Digital Local

    Processor Exhchange. It provides service for it's customers. It can also provide other facilities dependaent on it's role as either a DCCE or DLE. DLE Digital Local Exchange. This is a DLSU which may host RCUs as in

  5. for DCCEs and also act as a parent for those ALEs which will be replaced by RSUs parented upon the DLE as in b) and c) of DCCEs. DLT Digital Line Termination DMS100 Digital Multiplexor Switch, make by AT&T Bell, and used in England

    as an International Gateway Exchange. DMSU S-X Digital Main Switching Unit. Provides a fully interconencted Trunk

    Network. Each DMSU catchment area will compromise of several old GSC areas. The DMSU will switch traffic bother between and within the catchment area. DMU Dialled Meter Unit. DN Directory Number DPC Destination Point Code DPLE Digital Principle Local Exchange. Main exchange for an area. DS3 Digital Subscribers Switching Subsystem. This is in principle the

    same as the RCU yet it is situated inside the exchange - both are usually called subscontractors. It is used to connect subscribers to the local exchange. They are connected via PCM links. DSG District Support Group (BT District Staf) DSS S-X Digital Switch Subsystem. The DSS carries out all the switching

    functions on a System X exchange - Trunk or local. DSSS S-X Digital Subscribers Switching Subsystem. See DS3. DSW D-Switch DWI Display Work Instructions - A common found trash.

    EBP Exchange Based Processor ECTE Exchange Terminal Computer Equiptment ERS Emergency Repair Service EL Exchange Log EN Equipment Number END Exchange name documentation
    FNET FeatureNet. FMR FaultMan's Ringback. Dial the FMR (3 digit starting with 1 -

    generally 17x) number and replace handset, upon ringback the service should provide a quick analysis of any problems.

    GP Global Profile
    HTD Hardware trial period.
    I/C Incoming IDDF Intermediate Digital Distribution Frame ISDN Intergrated Services Digital Network. ISIS Inland Services Infomation System. ISIS is basically a book and

    manual service. Within ISIS it is possible to find infomation through indexing. Coding is AAA/BBB/Cxxx. AAA = Discipline, BBB = Main Subject, C = Tertiary Function/Specialism, xxx = document number. AAA - listing approx 30 disciplines eg, Personal, Transmission, Operator Services, Customer Services etc.. BBB - Listing approx 150 main subjects within the respective disiplines eg Employment, Optical Fibre systems, Operating procedures etc.. C - Listing approx 500 functions of specialisms within their respective main subjects. E.g Recruitment, Planning & Implentation etc.. EXAMPLE = CSS/CCS/C010.. installation practice for mini master 3 ISOS In Service Operational Support (Manufactures Staff). The ISOS

    would be called in when an urgent problem needs a higher level of support, or if a major service failure occours they can be called in quicker than the PSG.

    JAX S-X Junction Circuit Auxiliary JCA S-X Junction Circuit Auxiliary JGX S-X Junction General Purpose Auxiliary JSW S-X Junction Q Switch JUN S-X Junction Subscriber
    LAN Local Area Network LAP Local Access Point LCG Line Controller Group LCN Line Controller Number LID LAN Interface Device LLE Large Local Exchange. LNE Subscriber Line LNO London Network Operations LPT Local Control Point Port LUN Line Unit
    MAIU Meter Alarm & Interface Unit MCO Maintenance Clearence Officer. OMU worked responsible for making

    sure all tasks and routines have been carried out. MCS S-X Maintenance Control Subsystem. Carries out maintenance functions. MDF Main Distribution Frame MED Possibly the best H^P group in the world. :) MEER Miscellaneous Electronic Equiptment Rack MFX MF4 Test Auxiliary Board MLE Medium Local Exchange. MMI Man-Machine Interface MMIS Man-Machine Interface Subsystem. The MMIS allows engineers to

    control and manage the exchange through VDT's etc.. MML Man-Machine Language MOJ Metering Over Junction MPCS Multi Party Connection Subsystem. The MPCS allows 3>10 subscribers

    to be connected together at the same time. MPR Microprocessor MRA Malfunction Reporting Alarm MSS Management Statistic Subsystem. Keeps records of the junction

    routes in the local exchange and keeps traffic records for DS3s and RCUs under it's control and also for the AAS. MTS S-X Message Transmission Subsystem. Terminal part of CCS (not to be

    confused with CSS) link. It transmits and recieves messages sent between distanct CPSs (Call Processing Subsystems) and carriers out error checks on messages and re-transmits if necessary. MTS(MsgFor)The MTS message format is : - Error Check, Message, Routing label,

    header. The header contains the message number incase a resend is needed, the routing label includes the OPC (Originating Point Code) which identifys the originating exchange and the Destination Point Code (DPE) which identifies the destination exchange. The message tells CPS what it has to do and the error check obviously checks the message for errors.

    NAC Number Area Code NIC Network Interlock Code NSS Network Synchronisaton Facility
    O&M S-X Operations & Maintenance, look out for these (big!) folders in a

    sys-x exchange. O/G Outgoing OIM Operation & Maintenance OCB Outgoing Calls Barred OMC Operations & Maintenance Center. BT policy requires this, collects

    data from exchanges and monitors data for presentation for the OMC staff (Traffic, Sales, Operation & Maintenance Unit. (OMU) ) OMU Operation and Maintenance Unit. Room where engineers moniter the

    performance of the exchanges, and recieve data collected my the OMC. There is one or more connected to each OMC. OMU staff can send data to the OMC to control the exchanges conneted to it. OOS Out Of Service OUC Organisational Unit Code

    PABX Private Automatic Branch Exchange PACE Plessey Automatic Commisioning Equiptment PATE4 Print Analysis - TXE4 PBX Private Branch Exchange PCM Pulse Code Modulation PCM links A maximum of 30 channel PCM systems coontect to the DSS which

    gives 240 speech channels (8x30) which are available to 2048 subscribers. PCS Subscriber's Private Circuit PDN Private Data Network PFT Pass Fail Thresholds PLEXUS/SDF Computer center with both ICL and PLEXUS systems PRAT Primary rate access terminal POE Path Of Entry TPOE Translation Point Of Entry PSG Product Support Group (BT Headquarters Staff). PSGs can be called

    in if there is a problem on site. They give the authority for any emergency design modifications carried out without authority having being gained in advance. PSN Packet Switched Network PSTN Public Switched Telephone Network - The standard telephone service PSU Power Supply Unit PUS2 The Central Processor which provideds the processing power and

    storage facilites for all other subsystems. PXSM Pre-Extension Site meeting

    QSU Q-Switch
    RAD Resistance Adjustment RALP Remote Alarm lamp panel. RATES Remote Access Test Equiptment System. RCC Remote Concentrator Centre. Point with many RCU's. REMT Remote. RMCC S-X Remote Multi-Concentrator Unit. Two or more subscribers connected

    in a RCC. RCU Remote Concentrator Units. These must be connected to the DLSU and

    are considered as part of the DLSU to which they are connected. The RCU is situated away from the Telecom building in a more convienient place and it is the apparatus that divides the lines and gives them their equiptment numbers. If there is no connection between the RSU and the exchange then customers may still call numbers controlled by the RSU but not outside. Charge Handling is handled at the TE so if there is no connection to the TE there is no call charge. Telecom uses a standard two RCUs for security reasons. RFA Ringer Fuse Alarm RTU Remote Terminal Unit

    SAC Service Address Code SADIE TXE Subscriber Automatic DIsconnect Equitment. Used to place

    subscribers apparatus TOS (Temporalily Out Of Service). SALT Subscribers Automatic Line Testing. For System X and Y exchanges.

    The code for this is generally 175 and has the same job as the FaultsMans Ringback but is more advanced with increased options after the ringback. SBR S-X ENS Exchange Subscriber SDP System data page SPM Customer's Private Meter SPU S-X Speech Interworking Unit. SIS S-X Signalling Interworking Subsystem. Used as an interface between a

    System-X exchange and analogue exchanges. It convers analogue to 30 channel PCM for connection to the DSS. In like local exchange, unlike to trunk exchange it does not send tones or annoucments - the AAS does. SIU Slide-In-Unit STX Substitution Auxiliary

    TAC S-X Test Access Console TCC Through Connected Circuit . TE Telephone Exchange/Terminating Equipment. TID Terminal Identity. THW DSSS Test Highway TKO TrunK Offering TNC S-X Test Network Controller. TNET Tymnet TNS S-X Test Network Subsystem. The TNS controls the accessing of and

    testing of all digital and analogue junctions and subcriber lines. It uses SIS to access analogue junction lines, DSS to access digital junctions and DS3 tto access subscribers lines. TOC Type Of Circuit Digits TOS Temporalily Out of Service TNC Test Network Controller TNO Test Network Operations TPN Telephony Process Number TSVC Telephone Service and Vechicle Centre TXD #'s A method of labeling types of exchange by number that forms part

    of the exchange's Network Nodal Identity which appears on all documents specific to the particular exchange. TXD NO EXCHANGE 3 RCU (System X) 5 UXD5 6-9 DLSU (System X) 13 DMSU 14 DJSU 30 OSSU 31 OCHC 53 RSU (AXE 10 (System Y)) 56-59 DLSU (AXE 10 (System Y)) 80-86 OMC TXE Telephone eXchange Electronic.. most commonly in the form of a

    TXE4, or TXE4A (cost reduced).

    UID User Identity UM Unit Manager. The UM is responsible for the service given by the

    TXD exchanges in his OMC area and the organisation of staff. UXC Utilities Card UXD5 Digital Exchange developed from the CDSS1 (Monarch) PABX.

    VMB Voice Mailbox VRS Voice Response System. Allows remote testing of subscriber's

    line gived number and code. There are possibly other systems under the heading VMS because it's not exactly very use specific.

    WMS Work Manager System. Used by BT engineers to download their

    infomation for jobs of the day. Generally used via a portable field terminal and acostic coupler. It is accessable from any termination point in England. WN Worldwide Networks WNI Worldwide Networks Intstruction

    XD ExDirectory.