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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