Micro Controller Unit (Mcu) - Avaya Nortel Communication Server 1000 Reference

• perform activation and deactivation of DSLs
• provide loopback control of DSLs
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) or directly to a single U
interface terminal. Normally this physical termination is to an NT1, which provides an S/T
interface that allows up to 8 physical terminals to be connected. 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:
• 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 Meridian 1 bus format
• multiplex 4 D-channels onto one timeslot
• perform activation and deactivation of DSLs
• provide loopback control of DSLs
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 CS 1000 bus format
• multiplex four D-channels onto one timeslot
• perform activation and deactivation of DSLs
• provide loopback control of DSLs

Micro Controller Unit (MCU)

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.
Circuit Card Reference
Functional description
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