Dual ISDN2 SbusXtender

The SbusXtender allows two independent ISDN2 Sbus connections to be extended up to 5km from the host equipment, each carried on a single copper pair. Many Digital PBXs offer ISDN S-bus interfaces as standard. The S interface can operate up to 0.9km (3000ft) under certain conditions and in most instances this is sufficient for normal use. When there is a requirement for the S-bus to be located much further from the PBX, the SbusXtender can be used to turn the four-wire S-bus interface into a two wire U interface, supporting 2BIQ encoding. The U interface cabling can theoretically be up to 5.5km (18,500ft) although in practical situations it may be less than this. The U interface can again be turned back to an S-bus interface using a standard NT-1 at the remote end where the ISDN terminals can be attached. The SbusXtender can optionally provide a voltage supply on the U interface to power the NT-1s if required. The SbusXtender can also be used with other equipment when only an S-bus interface is supplied but a U interface is required.

Features

• Host ST2U converter has two independent sections each of which connects through a two-wire copper cable to its associated remote end.
• 70V 3W power feed provided for line powering of remote U2ST converter.
• Theoretical maximum distance 5km
• Remote end single channel U2ST unit converts back to four-wire Sbus and provides restricted equipment powering.
• Full powering of Sbus available with mains powered version of U2ST converter.