Comtech EF Data CRS-200 REDUNDANCY SWITCH - Manual (Page 11)

CRS-200 COMTECH COMMUNICATIONS CORPORATION
CRS-200 REDUNDANCY SWITCH - OPERATIONS MANUAL PAGE 9
The Data connectors on the TMI plug-ins are 25 pin ‘D’ type male leading to/from the
modems, and female leading to/from the outside world (User Data). These conform to the
EIA 530 pinout, which allows for connection of different electrical standards, including
RS422, V.35, and RS232. Please note that it is the responsibility of the user to provide the
appropriate cables to connect to these EIA 530 connectors. A shielded 25 pin ‘D’ type
provides a very solid solution to EMC problems, unlike the V.35 Winchester connector. The
male connector to/from the modem requires a simple pin-to-pin cable with connectors of
opposite sex so that the other end can plug into the modem’s Data connector. The female
connector can then be treated as an extension of the traffic modem’s Data connector. The
RMI has no User Data connector since it will only replace one of the traffic modems. The
pinout for both connectors is provided in the next section.
The System Alarms connector on the System Controller card is another 25 pin female D-sub.
This provides the user with access to Form-C relay contacts that indicate the fault status of
the switch and the summary faults for the three modem alarm types. If any of the attached
modems has one of the three faults active, the corresponding relay will energize, forcing the
normally open pin to connect to (and the normally closed pin to disconnect from) the
common pin. There are also relay contacts to indicate which, if any, of the traffic modems
is currently being backed up. Another pin provides a ground connection when the audio
alarm is sounded so that additional sounders may be added by the user. The pinout details
for this connector are provided in the next section.
The IF Switch Control connector is a 25 pin male D-sub that should be cabled directly to the
corresponding connector on the CRS-280 Transponder Switch, if used. This not only supplies
power to the CRS-250, but also indicates the currently selected traffic modem and whether
the system is in bridged or back-up mode. The CRS-280 must perform the same bridging and
backing up functions to the transmit and receive IF signals to match what the CRS-200 does
to the terrestrial data signals. The pinout of this connector is provided in the next section.
The Remote Control connector is a male 9 pin D-sub. Access is provided to remote control
ports of the switch, both RS232 and RS485. The pinout details for this connector are
provided in the next section.
The Auxiliary Serial connector is another 9 pin D-sub, this one female. It is currently unused,
but is reserved for use as an additional RS-485-only remote link that may be added on future
revisions of the switch.