Workgroup Remote Access Switch 39
H
ARDWARE
O
VERVIEW
System Platforms
The two connectors available for LAN access are the AUI Ethernet and the 10Base-T. Only one of
the two ports may be activated at a time. If you attempt to use both, the system hardware
automatically defa ults to the 10Base-T por t. Note that the AUI port has a slide-latch mec hanism to
lock that connection into place.
The back panel also provides connectors for BRI lines. Depending upon platform option,
connectors are available for one, two, or four BRI lines (providing fro m two to eight connections).
These lines are identified by the numbers 1 through 4 stamped on the plate adjacent to the port. The
plate can be removed by taking out the two screws. Undern eath this pla te are one, two, or four pairs
of DIP switches (again, option dependent). These switches control the terminating resistors for the
Basic Rate Interface and sh ould be se t i n t h e sa me d irec tio n. If th e s witc hes are UP, t he swit ches ar e
“on,” meaning the resistors for the connector are providing termination for the BRI line. In the
event that both switches are not set in the same directio n, impro per operati on may resu lt. Note that
the system is shipped with the switches activated (ON). For further clarification, refer to the
following illustration.
For all types of connections, there must be terminati ng resi s tors at e ach en d of the lin e. For a Point-
to-Point connection, the 1000 platform is at the end of the line, so these DIP switches must be ON
to provide proper termination. In a Point-Multipoint connection, DIP switch settings are dependent
upon the physical configuration of the line. If the 1000 platform is at the end of the line, the
terminating resisto rs should be activ ated (DIP switche s ON). If another device at the end o f the line
is providing termination, the 1000 platform’s terminating resistors should be deactivated (DIP
switches OFF).
ON
1 2 3 4
Screws which secure plate
BRI port, plate on:
BRI port, plate off:
line 4 switches line 3 switches line 2 switches line 1 switches
If both switches in pair are in UP position, switches are ON.
switches 3&4 control line 1 (ON in illustration)
switches 1&2 control line 2 (ON in illustration)
For the B2 platform option, switches 3&4 control line 1;
switches 1&2 are not used.