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C
Descriptions of I/O
Cards
Asynchronous I/O
Cards
I
NSTALLING
This appendix describes how to install the WAN interface I/O cards, the
cards should be installed before you install the server on your network.
I/O cards provide an interface between outside users and the network.
Physically, each of the I/O card ports is connected to a modem or a
switched or dedicated digital line for connection to the outside world.
Three types of I/O cards are available:
asynchronous cards for dial-up telephone line connections (three
models)
ISDN cards (U and S/T interfaces)
a synchronous card for connections to high-speed leased lines.
This section provides a brief description of each of the available I/O
cards.
The asynchronous cards are available in three versions:
A 4-port asynchronous card has four RJ-45 connector jacks with
port status LEDs,
an 8-port asynchronous card that has eight RJ-45 connector jacks
and supports operation to 57,600 bps,
an 8-port high speed asynchronous card that has eight RJ-45
connector jacks and supports operation to 115,400 bps.
Figure C-1 shows the asynchronous I/O cards and the external ports on
the back panel for the 4-port and 8-port asynchronous cards (since the
8-port cards look similar, only one is shown).
I/O C
ARDS
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