Comtech EF Data CRS-200 - Manual (Page 22)

Functional Description CRS-200 Redundancy Switch
3–2 Rev. 1
Each traffic modem is connected to the switch by its Traffic Modem Interface (TMI)
card. The same type of 25-pin cable used on the RMI should be used to connect the TMI
to the traffic modem’s primary data connector, again with fault status and EIA--232
remote link included.A second connector on the TMI (this one female) serves as the
terrestrial data interface. The TMI modules are designed so that they may be inserted or
removed while the switch is turned on, without causing interruptions to the data traffic.
The TMIs also have a rear Online LED, as well as a Bridged LED that also matches the
front panel version. Any switch that is ordered with fewer than 10 TMI cards will have
blank plates installed in place of TMI cards in the last unused slots.
The System Controller card is the heart of the switch, containing a 16-bit microcontroller,
flash-upgradable PROM and non-volatile memory. In addition to a 9-pin D-sub connector
(male) for remote communication between the switch and a PC in either EIA-232 or EIA-
485 format, the System Controller also has a 25-pin connector (male) for interfacing the
switch to the Comtech IF transponder switch, a 25-pin connector (female) for switch and
modem alarm relay outputs and another 9-pin (female) connector that is reserved for a
possible auxiliary EIA-485 remote link.