Comtech EF Data SMS-758 - Manual (Page 26)

Introduction SMS-758 Modem Protection Switch
1–10 MN/SMS758 Rev. 3
1.4 Performance Specification
The operating specifications of the switch are described in Table 1-1.
Table 1-1. SMS-758 Performance Specification
Operation
Number of Online Modems Expandable from 1 to 8 with plug-in prime
interface switch modules (the modems can be
of different data rates and interfaces, as long
as the backup modems are compatible).
Number of Backup Modems Expandable from 1 to 2 with plug-in backup
interface switch modules (IDR AS/0895
interface limits the backup to one).
Data Interfaces DS-1 and G.703, V.35, RS-422/449/
MIL-STD-188-114, IBS, IDR, or D&I.
IF Frequency Response 50 MHz to 180 MHz.
Downlinks Each demodulator is configurable for 1 of 4 or
7 downlink connections.
Uplinks Eight modulator outputs may be externally
combined/divided for any number of uplinks.
Prime Modulator to Output Loss Less than 1 dB.
Backup Modulator to Prime Output Loss Less than 1 dB.
Manual Delay Switch-Over Time:
Modulator
Demodulator
0 to 127.5 sec., in 0.5 sec. steps.
0 to 127.5 sec., in 0.5 sec. steps.
Auto Delay Switch-Over Time:
Modulator
Demodulator
< 1 sec.
< 3 sweep periods of the back-up
demodulator.
Switch-Over Priority One of three priority levels available
independently for each modulator and
demodulator, if independent mod/demod
firmware is used. Modulators and
demodulators will switch simultaneously with
modem switch firmware.
Remote Control Interfaces:
External control
Modem Control
RS-485 or RS-232C. Baud rates from 110 to
9600, Even or Odd parity, Addresses from
1 to 255.
RS-485, Baud rate 9600, Even parity,
Addresses from 1 to 255.
Batteries M&C: NiCad, 30 day memory retention.
48 hr. charge time.