Erriccson AXE10 Digital Switch Info                    By Keltic Phr0st
 ===================================                    ================

 The Erriccson digital switch is one of the most widely used pieces of
 telecommunications equipment in Operation today.
 Working alongside more primitive UXD5b, TXE2/4 and 5AESS units, it stands
 out as a more user friendly and feature packed device. 
        
        The switch is also relied on heavily for cellular wireline links,
 and it is in this area in which it basically shits on the equivalent 
 GEC Plessey equipment from a great height, allowing quicker fault finding,
 maintennance, and dynamic operation. What follows is a small description
 of the key components encountered during day to day test operations 
 and maintennance.

 (Compiled from CBT AXE Switch Maintennance tutorial)
 
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 Simple Commands:
 ================
 
 ALLIP;         Obtain alarm list printout, F1 frees terminal to print device
 EXPOP;         Find fault Position, Give Exchange, Floor, Row, Cab and shelf
 REMEI;         Commence Test Blocking of Equipment mount
 RECEI;         Commence Test De-Blocking of Equipment mount

 The following publications contain all the Information required for AXE10
 daily operation and maintennance. They can be obtained from Erriccson by
 simple engineering, or simply stolen or trashed:

 Grey Folders, marked:  B11 - Command Descriptions
                        B13 - Printout Descriptions
                        B03 - Operational Instructions


 Abbreviations:
 ==============

 DP : Device Processor
 
 TG : Tone Generator
 
 TP : Test Point
 
 RG : Ringing Generator
 
 SULTD : Subscriber Line Test Device
 
 ACCSC : Access Selector Circuit Board. A selector that gives devices
         for line test metallic access to a different Extension.
 
 DEVPU : Device Processor Unit, used for control of the SULTD and special
        equipment in digital subscriber stages.
        
 EMG's : Equipment Module Groups, points which can be optionally connected.

 DTG   : Generates up to eight independent tones and under regional 
         processor control, interrupts and distributes those to 
         tone injection.

 EMPC  : Works with memory board to form an extension module regional
         processor (EMRP); Communicates with surrounding world via buses.

 KRD   : Keyset code reception device, together with line adaption unit,
         is used for reception of subscriber signals in the form of two
         simultaneous frequencies selected from two seperate groups.
         (Correct me if I'm wrong, but doesnt the above sound like the 
          device that handles all the DTMF signalling from subscribers
          before it is then fed to the switching unit itself? -=KpT=-)

 LTAB  : Same basic operations as SLTC, but provides different functions.
         Provides interface to LIC, tone sending, ring generation supervision.

 MEU3  : Memory Board, stores information.

 POU   : Contains two DC/DC converters which convert the exchange battery 
         voltage into two regulated voltages independent of each other. 
         Supplies power to magazine in which it is mounted.

 REU   : DC/AC Converts exchange battery voltage to alternating voltage
         for ringing signals.

 SLTC  : Subscriber Line Test Equipment (SULT) is used to test subscriber
         lines. Connects the LTAB board. Connected both to subscriber line
         and to possible operator via SLCT, ACCS and the test access on LIC.


 More Information can be leeched from:
 
 Erriccson Telecom
 Technical Training
 MV/ETX/TI/KR Hakan Mattsson
 S-126 25 
 Stockholm 
 Sweden

 Tel : +46 8 7194683

 On Screen F-Keys :
 ==================
 PF1 = UPD
 PF2 = ADD
 PF3 = BWD
 PF4 = FWD
 PF5 = DEL
 PF6 = BARPR
 PF7 = EET
 PF8 = GROUP
 PF9 = EXSL
 PF12 = UNSL
 PF13 = BRS
 PF14 = INDEX
 PF15 = BLK
 PF16 = J/TX
 PF17 = COPY