Nortel DMS-100 Series Maintenance Manual page 59

Maintenance overview 1-47
Scan Detector Card (NT0X10). The scan detector (SC) card provides an
interface where the DMS-100 Switch Alarm System software can
monitor the state of the RLCM-EDC hardware to detect alarm conditions
or manually controlled operations. The SC card is divided into two
circuits, each known as an SC group. Each SC group contains seven SC
points. Each SC point connects one circuit to be monitored for a change
in state.
Signal Distribution Card (NT2X57). The signal distribution (SD) card
provides an interface between DMS-100 Switch Alarm System software
and relay-controlled equipment for 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 known as an
SD group. Each SD group consists of seven SD points. Each SD point
connects one visual or audible alarm.
Line Test Unit (NT2X10AA, AB, AC, NT2X11AA, AB, AC, AD). The
line test unit (LTU) is a testing facility that can be connected to a
selected line circuit through the remote MTA. The LTU contains two
cards: an analog test and measurement card (NT2X10) and a control card
(NT2X11). The two cards must be side by side, the NT2X10AB in an
odd-numbered slot, the NT2X11AA in the adjacent even numbered slot.
The LTU analog test card is used to perform 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 (NT2X10BA, NT2X11BA). The multiline test unit
(MTU) is an enhanced LTU that can replace the existing LTU. The
MTU contains two cards, an analog test and measurement card
(NT2X10BA), and a control card (NT2X11BA). The two cards must be
side by side, and the NT2X10BA must be in an odd numbered slot. The
MTU performs all the functions of the LTU with greater speed and
accuracy. It may also be used to test Meridian Business Set lines. The
NT2X11BA control card serves as an interface between the MTU analog
card and the RMM. The MTU contains two internal test units.
Incoming/Outgoing Test Trunk (NT2X90). The test trunk card provides
an interface between external test equipment, such as the number 14 line
test desk, and the RMM. The test trunk card provides monitoring and
speech circuits to subscriber lines and allows operator verification calls
through a VER90 trunk.
DMS-100 Family Maintenance Manual ABSK007