Comtech EF Data SMS-7000 - Manual (Page 49)

SMS-7000 Modem Protection Switch Installation
Rev. 3 2–15
2.4.1.1 SCU (J4) to DSU (J11) Interface
Refer to Figure 2-5.
Cable Assembly Part No. CA/5361 is provide with the switch. This is a single cable
interface between SCU Data Switch Interface J4 connector to the DSU Switch Controller
Interface J11 connector. The cable carries modem alarms, power supply faults, the serial
command link, and SCU power.
2.4.1.2 Remote Connection
Refer to Figure 2-5.
Option - Cable Assembly Part No. CA/0755 is offered by Comtech EFData. The remote
serial interface J6 connector of each modem in the configuration is bussed to the SCU
Modem Remote J2 connector.
This cable is a 9-pin D EIA-485 2-wire ribbon cable and must be connected before
programming the switch configuration. The cable assembly is configured for:
•
Baud Rate: 9.6 to 19.2K
•
7 Information bits
•
Parity: Even
•
2 Stop bits
Note: Ensure the modems are all set to EIA-485 2-wire and that the baud rates match.
The ribbon cable assembly is used to query the configuration of modems, to set the
configuration of the backup modem, and to verify the saved configuration of the
modems. This data is used by the switch controller to set the position of the relays in the
data modules.