Erriccson AXE10 Digital Switch Info                    By Keltic Phr0st
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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)

 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

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 :