The Patton Model 1075 KiloModem II™ X.21 short range modem allows point-to-point connection of synchronous X.21 devices at distances to 7.1 miles/11.4 km (see table below). Supporting switch selectable data rates of 32, 56 and 64 kbps, the Model 1075 provides internal, external or receive recovered clocking options. Diagnostics include V.54 and V.52 compliant tests. Both transformer isolation and surge protection are built into the Model 1075 as well.
 

Approvals: CE European Directives
DTE/DCE I/F: X.21 DB15F DCE or DTE, EIA RS-422 Compliant
Compatibility: 1035, 1045 , 1075, 1080A, 1090 series units
Transmission Format: Synchronous Transmission Unconditioned twisted pair 19 - 26 AWG
Line Interface: Externally accessible RJ-45 (RJ-11 Optional)
Clock: Internal, External and Network (Receive Recover)
Distance: Up to 7.1 miles (11.4 km)
Interfaces: CCITT/ITU X.21
Data Rates: 32, 56 and 64 Kbps (switch selectable)
Isolation: 1500V RMS via isolation transformers
Surge Protection: IEC-801-S, Level 2, 1kV Carrier Control Constantly on or Controlled by “Control” from DTE device (DCE mode) or “Indication” from DCE device (DTE mode)
Connectors: DB-15 female (X.21); RJ-45 on line side *
Power Supply: 9V DC transformer, 200mA
Temperature Range: 32-140°F (0-60°C)
Altitude: 0-15,000 feet (0-4,572 meters)
Humidity: 5 to 95% noncondensing
Dimensions: 1.54”H x 4.1”W x 3.7”D (3.9cm x 10.4cm x 9.4cm)
Power Options: 120 VAC 50/60Hz, external transformer; 230 VAC 50/60Hz, external transformer
Weight: 2.5 lbs. (1.1 Kg)