Nortel DMS-100 Series Maintenance Manual page 86

2-10 Functional overview
The position for LSG 0, LC-00 is assigned to a type A line circuit and used for
analog ringing tests. Circuit LSG 0, LC-00 is not available for assignment to
a subscriber line.
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When the suffix of the NT6X18 card is -AA or -AB and the line is identified
as ground start (GND=Y in table LNINV), run the diagnostics again if the
initial diagnostics fail. This action is possible with the addition of the Service
order (Servord) option NPGD, Negate Partial Ground Start Diagnostics. This
option allows you to test the line against a smaller subset of ground start
diagnostics. Because of this event, loop detector, reversal relay and ground
start relay tests are skipped when option NPGD is set in table LENLINES.
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The NT6X21AD line card provides a voice and signaling interface. This
interface is between a 2-wire analog subscriber line and one channel of the
4-wire 32-channel 2.56 Mb/s bit stream. This channel is part of the DMS-100
Family of DMS. The card occupies one slot in the line drawer of the LCM for
use with a P-phone telephone set. The P-phone telephone set connects to the
297-8361-550 Standard 04.02 December 2004
two-party, and PBX analog telephone sets (type 500 or 2500). The type A
card supports loop start, superimposed ringing, and frequency selective
ringing with bridged ringers. The type A card supports the cutover control
circuit. Refer to "Line card type B, coin".
Line card type B, coin, (NT6X18AA, AB, BA). The type B line card
provides all features of type A, plus multiparty lines. Line card type B
supports the following:
— coded ringing
— private branch exchange (PBX)
— ground start
— hotel/motel
— analog pay telephone sets that require coin control
Message-waiting line circuit card (NT6X19AA). This card provides all
the features of the type A line circuit, plus a message-waiting lamp driver
circuit. When activated, this circuit causes the message waiting lamp on
the associated telephone set to flash at 1 Hz. The flash informs the
subscriber that the system holds a message.
Message-waiting converter card (NT6X20AA). This card provides a
-150V synchronized pulse for the message-waiting lamp circuit.
Synchronized from the 2.56-MHz clock pulse in the OPM. You must
install this card in slot positions 0 and 16 of the odd LSG for NT6X20AA
to function correctly.
Line card type C Meridian Digital Centrex (MDC) (NT6X21AA, AB, AC,
and AD). Line card type C supports MDC-related electronic multiline
telephone sets and operator consoles.