Telos Zephyr Xstream - Manual (Page 375)

USER’S MANUAL
Appendix 10 – Glossary 363
U Interface The interface between the ISDN “BRI” line and the “NT1”. This can be considered
the ISDN “phone jack” in the USA & Canada, and is frequently in the form of a RJ‐ 11 or RJ‐ 45
style telephone jack. The center 2 pins are used on these jacks.
V.35 A serial data interface/connector pin out for synchronous data. V.35 uses balanced signal
and data lines. The Zephyr/Zephyr Xstream models 9X01, 9X00, support V.35 using part #9812
cable.
Variant The particular protocol (i.e. National ISDN‐ 1 or ETS 300) running on a specific switch.
Not all variants are valid for a specific switch. The switch brand and model plus the variant
defines the ISND protocol. Applies to configuring the 2101. See ISDN Protocol.
Virtual ISDN An alternative to repeaters which uses a local Telco Switch to act as a repeater and
which then sends the signal onto another switch which supports ISDN. See also Repeater.
Work Order See Trouble Ticket
X.21 A serial data interface for synchronous data popular in Europe. X.21 uses balanced data
and unbalanced signal lines. The Zephyr models 9X01, and 9X00 support X.21 using part #9822
cable.
Yellow Alarm An alarm on a T‐ carrier circuit that is returned by the local equipment if it is in a
Red Alarm state. A Red Alarm indicates a loss of inbound signal; a Yellow alarm indicates
(indirectly) a loss of outbound signal. See Red Alarm, Blue Alarm and LOS.