Nortel Meridian 1 Option 11C, Administration And Maintenance

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Page 260 of 492 Chapter 6 — ISDN BRI trunk implementation
553-3011-311 Standard 7.0 May 1999
NT6D70AA/NT6D70BA S/T Interface Line card (SILC)
The Option 11 SILC cards (NT6D70AA -48V North America, NT6D70BA
-40 V International) are the same circuit cards that are used by the rest of the
Meridian 1 product line. SILC circuit cards support the OSI physical layer
(layer 1) protocol. The SILC is a globally accepted standard interface. The
SILC card is required for MCDN TIE connectivity and Local exchange
connectivity.
The SILC provides eight S/T 4-wire full duplex polarity sensitive interfaces
that can be configured on a per DSL basis. This means that DSL trunk
connections may be configured on any of the 8 DSLs for any SILC. Each S/T
interface provides two B-channels and one D-channel.
Since only one trunk can be configured per DSL, trunking applications are
always non-blocking.
WARNING
Foreign and surge voltage protection
In-circuit protection against power line crosses or lightning is not
provided on the SILC line card. When the SILC line card is used in
TIE trunk applications in which the cabling is exposed to outside plant
conditions, an NT1 module certified for such applications must be
used. Check local regulations before providing such service.