The Patton Model TD-5601-L22 provides electrical isolation and the extension of 4-wire S/T-Interface ISDN communications. These units are ideally suited for the extension of ISDN ISDN T or S Bus Interfaces and PBX or SATCOM links. Traditional S/T cabling is limited to a maximum distance of 2953 feet (900 m), but multimode optics on the unit can extend the distance to 1.2 miles (2 km), while singlemode optics can further extend the distance to 12.4 miles (20 km).
The unit can be used in areas of high electrical noise or in and out of RF shielded enclosures. The fiber optic cable is not susceptible to interference caused by impulse noise, crosstalk, or EMI. Privacy of communications is also enhanced because the fiber optic cable does not radiate any emissions.