Supported Protocols - 3Com PathBuilder S200 Series User Manual

Supported Protocols

Supported Protocols

Overview
Switched Carrier
4
The TPA option can be used with other protocols on the same MX25 or X25 lines.
In Figure 2, an MX25 link and an X.25 link are used in a small network to switch
Transparent Polled Async, Bisync, and SDLC data.
Polled Bisync/
Async SDLC
HOST HOST
Modem
PB
S200
Modem
= To Polled Async,
Bisync, SDLC devices
Figure 2. Transparent Polled Async Used with Other Protocols in a
Network
In a Switched Carrier environment, the transmitting device raises the RTS signal,
sends an asynchronous message, and then drops the RTS signal. When the
PathBuilder S200 series switch sends the asynchronous message to the remote
device, the device raises the DCD signal, sends the asynchronous message, and then
drops the DCD signal. This action of performing Switched Carrier operations is
configurable using the EIA Signalling Action parameter.
X.25
MX25
Modem
PB
S200
Modem
PB
S200
PB
Modem S200
Modem
PB
S200
Transparent Polled Async