Comtech EF Data CRS-200 - Manual (Page 19)

CRS-200 Redundancy Switch Physical Description
Rev. 1 2–3
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.