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Introduction
1.4 Performance Specification
The operating specifications of the switch are described in Table 1-1.
Number of Online Modems
Number of Backup Modems
Data Interfaces
IF Frequency Response
Downlinks
Uplinks
Prime Modulator to Output Loss
Backup Modulator to Prime Output Loss
Manual Delay Switch-Over Time:
Auto Delay Switch-Over Time:
Switch-Over Priority
Remote Control Interfaces:
Batteries
1–10
Table 1-1. SMS-758 Performance Specification
Modulator
Demodulator
Modulator
Demodulator
External control
Modem Control
SMS-758 Modem Protection Switch
Operation
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).
Expandable from 1 to 2 with plug-in backup
interface switch modules (IDR AS/0895
interface limits the backup to one).
DS-1 and G.703, V.35, RS-422/449/
MIL-STD-188-114, IBS, IDR, or D&I.
50 MHz to 180 MHz.
Each demodulator is configurable for 1 of 4 or
7 downlink connections.
Eight modulator outputs may be externally
combined/divided for any number of uplinks.
Less than 1 dB.
Less than 1 dB.
0 to 127.5 sec., in 0.5 sec. steps.
0 to 127.5 sec., in 0.5 sec. steps.
< 1 sec.
< 3 sweep periods of the back-up
demodulator.
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.
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.
M&C: NiCad, 30 day memory retention.
48 hr. charge time.
MN/SMS758 Rev. 3
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