Nortel DMS-100 Series Maintenance Manual page 100

2-24 Functional overview
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297-8361-550 Standard 04.02 December 2004
Scan detector (SC) card (NT0X10). The SC card provides an interface.
The interface allows the DMS-100 Switch Alarm System software to
monitor the state of the OPM hardware. The system software detects alarm
conditions or manually controlled operations. The SC card is divided into
two circuits. Each circuit is called an SC group. Each SC group contains
seven SC points. Each SC point connects one circuit to monitor for a
change in state. One NT0X10 card is used in slot 8.
Signal distribution (SD) card (NT2X57). The SD card provides an
interface between DMS-100 Switch Alarm System software and
relay-controlled equipment. The interface allows the activation of visual
and audible alarms. The SC card serves as a monitor, and the SD card
serves as an alarm driver. The SD card is divided into two circuits. Each
circuit is called an SD group. Each SD group consists of seven SD points.
Each SD point connects one visual or audible alarm.
Digitone (DTR) receiver card (NT2X48AB). The DTR contains four
Digitone receivers to collect digits during OPM ESA.
Line test unit (LTU) card (NT2X10AA, AB, AC, NT2X11AA, AB, AC,
AD). The LTU is a testing facility that can connect to a selected line circuit
through the remote MTA. The LTU contains an analog test and
measurement card (NT2X10), and a control card (NT2X11). The two
cards must remain next to each other. The NT2X10AB must be in slot 3
and the NT2X11AA must be in slot 4. The LTU analog test card performs
tests and measurements on a subscriber loop or line card circuit. The
NT2X11 control card serves as an interface between the LTU analog card
and the RMM. The LTU contains one internal test unit.
Multiline test unit (MTU) card (NT2X10BA, NT2X11BA). The MTU is
an improved LTU that can replace the current LTU. The MTU contains an
analog test and measurement card (NT2X10BA), and a control card
(NT2X11BA). The two cards must remain next to each other, and the
NT2X10BA must be in slot 3. The MTU performs all the functions of the
LTU with greater speed and accuracy. The MTU can test Meridian
Business Set lines and OPM battery maintenance. The NT2X11BA
control card serves as an interface between the MTU analog card and the
RMM. The MTU contains two internal test units but only one is used in
this application.
Incoming/outgoing test trunk card (NT2X90). The test trunk card provides
an interface between external test equipment, like the number 14 line test
desk, and the RMM. The test trunk card monitors and provides speech
circuits to subscriber lines and allows operator verification calls through a
VER90 trunk. One NT2X90 is used in slot 09 and one in slot 10.