Telos Zephyr Xstream - Manual (Page 372)

USER’S MANUAL
Appendix 10 – Glossary 360
Custom PMP, and DMS custom ISDN protocols the equipment requires that the user to program
SPIDs into it. Custom PTP and ETS 300 protocols do not require a SPID. No SPIDs are required for
ISDN PRI protocols.
SS7 ‐ Signaling System 7 The internationally adopted Common Channel Interactive Signaling
(CCIS) system. Previous to SS7 the Bell System used SS6 which did not support the International
Standards. SS7 does. It allows for substantially flexibility and power in dynamically routings calls.
An SS7 database lookup is how a call to a mobile telephone user can handled transparently
despite the fact that the user's location may change. Also used to determine what carrier should
handle a given toll free call. See also CCIS.
Station Line A telephone circuit from a PBX to a telephone on that PBX. Since this is a
telephone‐ to‐ switch connection it is considered to be a “line”. See Line and Trunk
Station Side The user side of a PBX. The side of the switch that the telephones are attached.
Also, occasionally called the 'line side'. The main reason for distinguishing between this and the
trunk side is that certain customer related features (Such as Hold and Transfer) are inapplicable
to trunks. See also Trunk Side.
Statistical Multiplexing A method of improving effective bandwidth of a Telco channel.
Statistical Multiplexing takes advantage that there are typically many pauses in a conversation.
By taking advantage of this fact, and not sending the pauses, improvements in efficiency can be
made. Also referred to as silence suppression. See Circuit Switched.
Subscriber The customer of a Telecommunications company. This term dates back to when a
local Telephone Company was formed at the specific request of a group of customers who
agreed in advance to “subscribe” to the service.
Superframe See SF
Switch Telephone switching device which “makes the connection” when you place a call.
Modern switches are specialized computers. ISDN service is provided from a “Digital” switch,
most commonly (in the USA & Canada) an AT&T model “5ESS”, Northern Telecom model “DMS‐
100”, or Siemens model “EWSD”. The switch, and related software running on it, will determine
which ISDN protocol(s) will be available to customers connected to it. See also PBX.
Switch Type (ZephyrExpress) The utility menu item where the ISDN Protocol is selected. See
Telco Setting and National ISDN.
Switched Circuit A channel which is not permanent in nature, but is connected through a
switching device of some kind. The switching device allows a switched circuit to access many
other switched circuits (the usual “dial up” type of telephone channels). Once the connection is
made however, the complete capacity of the channel is available for use. As opposed to a
dedicated circuit or a packet based connection.
Switched‐ 56 A type of digital telephone service developed in the mid 1980’s which allows
dialing on a single 56Kbps line. Each Switched‐ 56 circuit has 1 or 2 copper wire‐pairs associated
with it. You will need to know in advance if you will have the two‐ wire or four‐wire version so
you can procure the appropriate CSU/DSU. Switched‐ 56 is being rapidly replaced with ISDN,
which is cheaper and more flexible. See also CSU/DSU.