Nortel DMS-100 Series Maintenance Manual page 24

Outside plant access cabinet (opac)

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Table of Contents

1-8 Maintenance overview

Host interface equipment shelf layout

Note: The LCA contains the NT6X51AB 256 Kbyte processor card. This card

requires the extended memory line concentrating module (XLCM) software load.

LCM control complex cards

The LCM processor (LCMP) card and DCC are common cards in the LCA.

In each LCA, the common cards function identically and are always

provided. A description of the functions of these cards follows.

XLCM processor card

The extended-memory line concentrating module (XLCM) processor card

(NT6X51AB) is in slot 04 of each LCA shelf. The XLCM processor card

connects with the DCC to form the control complex for the LCA. The

XLCM processor card checks sanity and monitors activity. The XLCM

processor also monitors the power and ringing generator functions of the

The XLCM contains 256 kBytes of random access memory (RAM) storage.

The XLCM collects dial pulse digits from subscriber lines. The XLCM

handles messages to and from the host LTC, LGC, or RCC. The maximum

number of lines is 640. The NT6X51AB requires XLCM software loads.

Digroup control card

The DCC (NT6X52) is in slot 05 of the LCA shelf. The DCC allows the

LCA and HIE shelves to communicate.

The DCC provides an interface between the equivalent LCM processor in

the LCA and one link control card (LCC) in the HIE. The DCC provides

this interface through eight DS30A links. The following figure shows this

297-8211-550 Standard 05.01 August 1999

Abbreviation

Power converter. Also contains

ringing and ANI voltage

switching circuits.

XLCM processor card (see note)

Digroup control card

Line subgroup

Troubleshooting