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
QUAD
MAGNETICS
NWK954
QUAD
MAGNETICS
NWK954
QUAD
MAGNETICS
NWK954
QUAD
MAGNETICS
NWK954
QUAD
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
