Nortel Meridian 1 Option 11C, Administration And Maintenance

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Chapter 6 — ISDN BRI trunk implementation Page 261 of 492
Option 11C ISDN BRI Administration and Maintenance
NT6D71 U Interface Line Card (UILC)
The UILC interface supports a two-wire point-to-point loop consisting of a
twisted pair engineered for 2B1Q line coding on the DSL. The Option 11
UILC card (NT6D71) is the same circuit card that is used by the rest of the
Meridian 1 product line. UILC circuit cards support the OSI physical layer
(layer 1) protocol. The UILC supports 2B1Q encoding. The UILC card is
required for TIE trunk connectivity SILC to UILC as shown in Figure 40.
The UILC provides eight two-wire full duplex (not polarity sensitive) U
interfaces. Each U interface provides two B-channels and one D-channel and
supports one physical termination. This termination may be to a Network
Termination (NT1). Normally this physical termination is to an NT1, (that
supports ANSI 2B1Q line encoding) which provides an S/T interface.
The length of a UILC DSL depends on the DSL wire gauge, however, it
should not exceed 5 km (16,405 ft).
Clock controller
A clock controller is required for ISDN PRI, DTI or BRI trunk applications.
The Option 11 system supports a single active clock controller (CC). This
clock controller can support both a primary and a secondary reference clock.
These reference clock sources may be derived from either DTI, PRI or BRI
spans/DSLs (DSL 0 and/or DSL 1).
Network Termination 1 (NT1)
Stand-alone NT1 unit
The stand-alone NT1 product, which is typically installed at the user's work
area, consists of the following units:
— the NT1 unit
— the optional NT1 power supply
— a mounting plate