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ISDN Line Ordering and Configuration
In the U.S. and Canada, an NT1 Network Terminator is required to provide an interface between
the CyberSWITCH 100 and the ISDN line. The NT1 offers conversion between the two-wire
twisted pair (U-loop interface) used by telephone companies and the four-wire terminal equipment
(S/T Interface) as well as line-testing capabilities. You can order the CyberSWITCH 100 with an
internal NT1
(CSX103
or CSX105) or use your own NT1 equipment
(CSX101, and
CSX104).
External Network Terminator equipment comes with its own power supply (built-in or external).
In Europe and Japan, the telephone company provides the NT1 and offers end-users the S/T
interface. The S refers to a connection between customer equipment in some ISDN configurations
when a PBX is present. The T refers to the connection between the NT1 device and the
CyberSWITCH 100.
The ISDN pairs are the same wires that exist for analog telephone service. In most cases, the same
wires can be used for the ISDN line. The EIA/TIA standard for wiring is Unshielded Twisted Pair
(UTP) cable. Category 3 or above, 24 AWG (American Wire Gauge). The standard also
recommends using 8-contact RJ45 jacks for new ISDN service installation. No special
conditioning is required; in some cases, conditioning must be removed.
ISDN BRI Configurations
ISDN BRI lines can be configured in point-to-point and multi-point configurations. With a
point-to-point configuration, only one device is connected to the ISDN line. With a multi-point
configuration, it is possible to have up to 8 devices (telephones, faxes, routers, etc.) connected to
the line.
Since the ISDN BRI line is used for a high speed LAN-to-LAN link, you must ensure that
additional devices connected to the S/T interface allow sufficient access for the bandwidth
requirements of the CyberSWITCH 100. The device support through the POTS (Plain Old
Telephone Service) interface allows multiple devices per port, but only one call initiated at a time
(though another call can be in progress).
CyberSWITCH 100 Advanced User Information
3
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