Mitel NWK954 User Manual

Nwk954, Quad fast ethernet repeater

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The NWK954 is a fully integrated, unmanaged, 4-port Fast

Ethernet Repeater conforming to the IEEE 802.3 100BASE-TX
Standard. The device integrates the 802.3 Repeater functions
with four 100BASE-TX PHY modules, enabling direct connection
to the isolation transformers with no additional PHY components.

It has built-in LED drivers for display of port activity and

network utilization. There is a local expansion port which allows
up to six NWK954s to be cascaded to form a 24-port repeater
with no additional components.

With the addition of simple backplane driver/receivers, up to

eight 24-port repeaters can be stacked.

The NWK954 is supplied in a 128-pin PQFP and interfaces

to the twisted pair media through 1:1 isolation transformers.

QUAD RJ45

QUAD

MAGNETICS

NWK954

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MAGNETICS

NWK954

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MAGNETICS

NWK954

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MAGNETICS

NWK954

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MAGNETICS

NWK954

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MAGNETICS

NWK954

CLOCK DRIVERS

OSCILLATOR

BACKPLANE BUFFERS

BACKPLANE CONTROLS

LOCAL EXPANSION BUS

Fig. 1 System block diagram

FEATURES

Compliant with IEEE 802.3 100BASE-TX Repeater
Unit Specification

Incorporates four IEEE 802.3 Compliant 100BASE-TX
Ports

Local Expansion Port for Cascading to 24 Ports

Stackable Backplane for Expansion up to 192 Ports

Link/Activity LED and Receive Error LED for each Port

Collision LED

Five LED Network Utilization Display

Base Line Wander Correction

Power Saving on Unused Ports

Driven from a Single 25MHz Clock

Single 5V supply

Low Power CMOS Technology

128-pin PQFP package

ORDERING INFORMATION

NWK954D/CG/GH1N

NWK954

QUAD FAST ETHERNET REPEATER

PRELIMINARY INFORMATION

Supersedes January 1998 version, DS4842 - 1.1

DS4842-2.1 April 1998

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