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Theory of Operation
4.10 Online Telemetry
The online telemetry (Figure 4-22) is a 10.5" x 3.5" module that fits in slot 6 of the upper
front section of the switch chassis. It reports the online status of each prime modulator
and demodulator. Refer to Figure 4-23 for a block diagram of the online telemetry
module.
4.10.1 Specifications
Number of Channels
Switching Format
4.10.2 Theory of Operation
The M&C controls the online telemetry module through the address decoder/driver with
an 8-bit data bus and 2 device select lines. Sixteen SPDT relays (Form C) can be
switched to indicate the online status of eight prime modulators and eight prime
demodulators.
4–50
8 modulator and 8 demodulator.
Form C contacts.
SMS-758 Modem Protection Switch
MN/SMS758 Rev. 3
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