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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
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SPECIFICATIONS
- Asynchronous or Synchronous
- Data rates up to 19.2 kbps
- V.54 diagnostics, including local and remote test
- Full or half duplex, point-to-point or multipoint
- Internal, external or receive clock
- Transmission range up to 17 km (10 miles)
- Lightning protected
- No AC power required
- Easy to install
- Miniature, lightweight
SRM-8/*/+
Miniature Asynchronous/Synchronous Short Range Modem
*Specify:
F for female 25-pin connector
M for male 25-pin connector +Specify line interface:
RJ-11 for RJ-11 jack
RJ-45 for RJ-45 jack on a 2m / 6 ft cable
RJ-45S for RJ-45 jack (Default is terminal block.)
ORDERING
SRM8/F
SRM8/F/RJ11
SRM8/F/RJ45
SRM8/F/RJ45S
SRM8/M
SRM8/M/RJ11
SRM8/M/RJ45
SRM8/M/RJ45S
APPLICATIONS
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