FEATURES
SRM-5TX and SRM-6TX, Asynchronous 2-wire Short Range Modems, are used for local data distribution, connecting asynchronous V.24 digital equipment. The modems operate full duplex over existing 2-wire single twisted pairs or coax cables at data rates up to 19.2 kbps, over a range of 1 km (0.6 miles).
SRM-5TX and SRM-6TX are fully compatible with each other and offer the same features. SRM-5TX is smaller, only 69 mm (2.7 in) by 18 mm (0.7 in); SRM-6TX is 110 mm (4.3 in) by 22 mm (0.9 in).
SRM-5TX and SRM-6TX are also available as cards for mounting in a 19' modem rack (see the CMN-16 and CMN-C6TX data sheets).
The transmit carrier is strap-selectable for either continuous operation or switched operation. The switched carrier operation enables transfer of one control signal end-to-end, making the modem suitable for connection to printers and statistical multiplexers. When in switched carrier operation, the carrier is controlled by the DTR signal (Circuit 108/2) and transferred to the DSR signal (Circuit 107) in the opposite modem. The DCD signal (Circuit 109) remains ON, regardless of the transmit carrier strapping. A LED indicator lights on SRM-5TX, whenever DSR is present.
Innovative circuitry allows SRM-5TX and SRM-6TX to operate without connection to the mains supply, by using ultra-low power from the data and control signals.
Coupling to the twisted pair line is done via isolation transformers which, in conjunction with other circuitry, protect against AC or DC overvoltages.
The low transmit level of the modems minimizes crosstalk onto adjacent circuits within the same cable.
The modems are available with a male or female integral 25-pin connector for the DTE interface, and a 3-screw (2-wire and ground) terminal block for the line. SRM-6TX is available with an RJ-11 connector, an RJ-45 connector or a female BNC on a pig-tail.SRM-5TX comes with a choice of RJ-12 or RJ-45 connector (see Ordering), in addition to the terminal block.
Note: RJ-12 is an RJ-11 connector with Pins 1 and 6 grounded.
FEATURES
- SRM-5TX and SRM-6TX, Asynchronous 2-wire Short Range Modems, are used for local data distribution, connecting asynchronous V.24 digital equipment. The modems operate full duplex over existing 2-wire single twisted pairs or coax cables at data rates up to 19.2 kbps, over a range of 1 km (0.6 miles).
- SRM-5TX and SRM-6TX are fully compatible with each other and offer the same features. SRM-5TX is smaller, only 69 mm (2.7 in) by 18 mm (0.7 in); SRM-6TX is 110 mm (4.3 in) by 22 mm (0.9 in).
- SRM-5TX and SRM-6TX are also available as cards for mounting in a 19' modem rack (see the CMN-16 and CMN-C6TX data sheets).
- The transmit carrier is strap-selectable for either continuous operation or switched operation. The switched carrier operation enables transfer of one control signal end-to-end, making the modem suitable for connection to printers and statistical multiplexers. When in switched carrier operation, the carrier is controlled by the DTR signal (Circuit 108/2) and transferred to the DSR signal (Circuit 107) in the opposite modem. The DCD signal (Circuit 109) remains ON, regardless of the transmit carrier strapping. A LED indicator lights on SRM-5TX, whenever DSR is present.
- Innovative circuitry allows SRM-5TX and SRM-6TX to operate without connection to the mains supply, by using ultra-low power from the data and control signals.
- Coupling to the twisted pair line is done via isolation transformers which, in conjunction with other circuitry, protect against AC or DC overvoltages.
- The low transmit level of the modems minimizes crosstalk onto adjacent circuits within the same cable.
- The modems are available with a male or female integral 25-pin connector for the DTE interface, and a 3-screw (2-wire and ground) terminal block for the line. SRM-6TX is available with an RJ-11 connector, an RJ-45 connector or a female BNC on a pig-tail.SRM-5TX comes with a choice of RJ-12 or RJ-45 connector (see Ordering), in addition to the terminal block.
Note: RJ-12 is an RJ-11 connector with Pins 1 and 6 grounded.
