10

Am79C100

criteria to continuously monitor the incoming signal’s

amplitude and timing characteristics to determine

when and if to assert the internal carrier sense.

For these reasons, it is crucial that the values and

tolerances of the external components be as specified.

Several manufacturers produce a module that com-

bines the functions of the transmit and receive filters

and the pulse transformers into one package.

Note:

The filter/transformer module shown is available from the following manufacturers: Belfuse, TDK, Pulse Engineering, PCA, Valor

Electronics, and Nano Pulse.

Figure 1.

Typical Twisted-Pair Port External Components

16511B-4

57.6

324.0

768.0

57.6

324.0

100

Ω

Am79C100

TPEX Plus

TXD+

TXP+

TXD–

TXP–

RXD+

RXD–

XMIT

Filter

RECV

Filter

1:1

1:1

TD+

TD–

RD+

RD–

Twisted-Pair

Cable

Module