Synchronous I/O Card - 3Com ACCESSBUILDER 4000 Installation Manual

C-2 A C: I I/O C
PPENDIX NSTALLING ARDS
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).
Port 4
Port 1
Port 8
Port 1
Figure C-1 Asynchronous I/O Card Major Components and Ports
Synchronous I/O
The synchronous card provides a V.35, RS-449, RS-232, or X.21 synchronous
Card
interface that can be used to interconnect the AccessBuilder to a
synchronous modem for digital lease line connections.
Figure C-2 shows the major components of the synchronous card and the
external port on the back panel.