SRM-5SC and SRM-6SC are short-range synchronous modems used for local data distribution and connecting full- or half-duplex synchronous DTEs or controllers to computers. A pair of modems ensures integrity of data transmission over unconditioned 4-wire dedicated lines, for distances of up to 14.5 km (9.1 miles), depending on the wire gauge and data rate.
SRM-5SC and SRM-6SC are fully compatible and offer the same features. SRM-5SC is the smaller version, only 61 mm (2.4 in) by 18 mm (0.7 in); SRM-6SC is 110 mm (4.3 in) by 22 mm (0.9 in).
