Comtech EF Data SMS-7000 - Manual (Page 52)

Installation SMS-7000 Modem Protection Switch
2–18 Rev. 3
3. Configure the switch controller, prime, and backup modems as follows:
a. Go to CONFIG/BACKUP #1 and insert all parameters.
Notes:
•
DEPENDENT switching is preferred and it is the only function to
operate in the Drop and Insert application.
•
The screen showing underlines will have to be filled in for the specific
modems that are to be backed up.
•
If a modem in the switch is required, but not to be backed up, then leave
field blank.
•
Turn MOD and DEMOD off on each prime modem, if the back up
modem is not to emulate the prime modem. The switch controller will
ignore the faults from the modem.
b. Configure the prime modems.
c. If Drop and Insert is the applications, then use Insert Clock as the RX Buffer.
Select LOOP that states; INSERT DATA INPUT LOOP or NORMAL.
Balance is for G.703 data cables that have different pairs.
d. Set LOAD ALL MODEMS. Fault lamps should go off.
4. Set switch mode from OPERATION to AUTO.
5. Backup modem should go into REMOTE.
6. Set switch screen to SYSTEM STATUS/SWITCHING.
7. Test the configured protection system as follows:
a. Crisscross the IF inputs on two prime modems.
b. Ensure the two modems transfer data to each other in the protection system.
c. Turn off the SDM-7000 switch to change data modules. If not, re-
initialization of the switch controller may result.