Interface: Conforms to EIA RS-232 and CCITT V.24 specifications. Pin 4 connected to Pin 5; Pins 6, 8, and 20 connected together. Pins 2 and 3 Transmit/Receive Data, switch selectable. Pin 7 Signal Ground

Connectors: RS232, 25 pin male or female (as ordered); 4-wire line, screw terminals and modular phone jack, RJ11. Power is 3.5mm plug

Data Rate: 0-19.2 KBPS

Transmission: Asynchronous; full duplex-two twisted pairs; simplex-one twisted pair. Current loop 12 ma via optical couplers. Conforms with Bell System Publication 43401

Operating Distance: The following table gives maximum distance as a function of data rate.

Data Rate (KBPS)	19.2	9.6	4.8	2.4	1.2
Distance (Miles)	1	2	3	5	10

Surge Protection: Built-in on 4 wire line

MTBF: 663,000 Hours (76 Years)

Power: Model 72A 115V, 60Hz, 0.1A; 220V, 50Hz Optional

Size: 3.5"L (89mm) x 2.2"W (56mm) x 1"H (25mm) (plus wall mounted transformer)

Environment: 0° to 50° C, 0% to 95% RH