FEATURES
The SRM-8, Miniature Async/Sync Short Range Modem, is used for local data distribution, connecting full or half duplex sync/async V.24 digital devices over unconditioned 4-wire dedicated lines (twisted pair). SRM-8 operates at data rates up to 19.2 kbps, and at distances up to 17 km (10.5 miles), depending on wire gauge and data rate.
SRM-8 performs diagnostic loops in compliance with the ITU V.54 standard. Two V.54 loops are available: analog loop (V.54 Loop 3) and remote digital loop (V.54 Loop 2). These loops are activated by either a three-position switch or by the DTE interface Circuit 141 (Pin 18) and Circuit 140 (Pin 21). A TEST LED lights when any of the diagnostic loops is ON.
Asynchronous transmission is provided by internal conversion from async to sync, in compliance with ITU V.22 bis standard. Different async formats are switch-selectable.
In Synchronous mode, transmit timing can be provided by three alternative sources:
Internal oscillator
External clock
Loopback clock derived from the receive signal.
The modem's carrier can be strapped for either continuous operation (point-to-point application) or switched operation, controlled by the RTS signal (multipoint application).
The low transmit level minimizes crosstalk onto adjacent circuits within the same cable. Data is transmitted and received at a balanced impedance, ensuring high immunity to circuit noise. Additionally, SRM-8 is coupled to the dedicated line through isolation transformers which, in conjunction with electronic circuitry, protect against AC or DC overvoltages.
Innovative circuitry allows operation without a power supply, using ultra-low power from the standard RS-232 / V.24 data and control signals.
Connection to the 4-wire line is via a five-screw terminal block. Optionally, the modems can be supplied with an RJ-11 jack, an RJ-45 plug on a 2m / 6 ft cable, or an RJ-45 jack
FEATURES
The SRM-8, Miniature Async/Sync Short Range Modem, is used for local data distribution, connecting full or half duplex sync/async V.24 digital devices over unconditioned 4-wire dedicated lines (twisted pair). SRM-8 operates at data rates up to 19.2 kbps, and at distances up to 17 km (10.5 miles), depending on wire gauge and data rate.
- SRM-8 performs diagnostic loops in compliance with the ITU V.54 standard. Two V.54 loops are available: analog loop (V.54 Loop 3) and remote digital loop (V.54 Loop 2). These loops are activated by either a three-position switch or by the DTE interface Circuit 141 (Pin 18) and Circuit 140 (Pin 21). A TEST LED lights when any of the diagnostic loops is ON.
- Asynchronous transmission is provided by internal conversion from async to sync, in compliance with ITU V.22 bis standard. Different async formats are switch-selectable.
- In Synchronous mode, transmit timing can be provided by three alternative sources:
- Internal oscillator
- External clock
- Loopback clock derived from the receive signal.
- The modem's carrier can be strapped for either continuous operation (point-to-point application) or switched operation, controlled by the RTS signal (multipoint application).
- The low transmit level minimizes crosstalk onto adjacent circuits within the same cable. Data is transmitted and received at a balanced impedance, ensuring high immunity to circuit noise. Additionally, SRM-8 is coupled to the dedicated line through isolation transformers which, in conjunction with electronic circuitry, protect against AC or DC overvoltages.
- Innovative circuitry allows operation without a power supply, using ultra-low power from the standard RS-232 / V.24 data and control signals.
- Connection to the 4-wire line is via a five-screw terminal block. Optionally, the modems can be supplied with an RJ-11 jack, an RJ-45 plug on a 2m / 6 ft cable, or an RJ-45 jack
