Nortel Networks Circuit Card User Manual

 NT6D71 UILC Line card

Power consumption is +5 V at 1900 mA.

Each U interface provides two B-channels and one D-channel and supports 
one physical termination. This termination can be to a Network Termination 
(NT1) or directly to a single U interface terminal. Usually, this physical 
termination is to an NT1, which provides an S/T interface that supports up to 
eight physical terminal connections. The length of a DSL depends on the 
specific terminal configuration and the DSL wire gauge; however, it should 
not exceed 5.5 km (3.3 mi).

The main functions of the UILC are as follows:

•

provide eight ISDN U interfaces conforming to ANSI standards

•

support point-to-point DSL terminal connections

•

provide channel mapping between ISDN BRI format (2B+D) and system 
bus format

•

multiplex four D-channels onto one timeslot

•

perform activation and deactivation of DSLs

•

provide loopback control of DSLs

The Micro Controller Unit (MCU) coordinates and controls the operation of 
the UILC. It has internal memory, a reset and sanity timer, a serial control 
interface, a maintenance signaling channel, and a digital pad.

The memory consists of 32 K of EPROM that contains the UILC operating 
program and 8 K of RAM that stores interface selection and other functions 
connected with call activities.

The reset and sanity timer logic resets the MCU.