Telos Zephyr Xstream - Manual (Page 373)

USER’S MANUAL
Appendix 10 – Glossary 361
Synchronous Data A form of serial data which uses a clock signal to synchronize the bit stream.
Since, unlike asynchronous data, no start and stop bits are used, data throughput is higher than
with asynchronous data. ISDN and T‐ 1 use Synchronous data. See also Asynchronous Data.
T‐ Link A proprietary Telos 2.048mbps channelized link. This link uses the DSX‐ 1 electrical
protocol and has 30 channels at 64kbps each.
T1 A common type of digital telephone carrier widely deployed within the US, Canada, and
Japan. Has 24 64Kbps channels (called DS׎’s). The most common framing scheme for T1 “robs”
bits for signaling leaving 56kbps per channel available for data use.
T‐1 An alternative expression for T1. See T1.
TA ‐ Terminal Adaptor. The electronic interface between an ISDN device and the NT1. The
terminal adapter handles the dialing functions and interfaces to the user’s data equipment as
well as to the NT1 on the “S” or “T” interface.
Tandem Switch A switch which is between two others. It connects two trunks together. Long
distance calls on a LEC line go through a long distance tandem that passes them through to the
long distance provider’s switch.
Tandem Tie Trunk Switching When a PBX switch allows a tie line call to dial out of the switch.
For example, if switch “A” in Arkansas has a tie line to switch “B” in Boise, Boise could use the tie
line to make calls from switch “A”.
TD‐ Transmit Data Data coming from the DTE towards the DCE or network. Also, a light on a
modem or CSU/DSU that lights to indicate presence of this signal.
TEI ‐ Terminal Endpoint Identifier An OSI Layer 2 identifier used by an ISDN terminal to
communicate with the serving CO. Most equipment uses a dynamic TEI assignmment procedure
.
Telco‐ Telephone Company Your local telephone service provider. In the 21st century you
generally have a choice of Telcos if you are a business in a major metropolitan area in the USA.
Competition is coming to the Telecom industry around the world.
Telco Setting (Xstream, Zephyr, TWO, TWOx12) The menu selection where the ISDN protocol is
selected. Choices are 'Natl I‐ 1' (for National ISDN), 'DMS Cust', (for DMS‐100 Custom Functional
ISDN), 'AT&T Cust' or 'PTP' (for AT&T Custom Point‐ to‐ Point), 'INS 64' (for Japanese ISDN) and
'ETS300' (for Euro‐ ISDN).
Telcordia Technologies Formerly Bellcore. The research and development organization owned
by the telephone companies. Telcordia represents the phone companies in developing
standards for Telco equipment and in testing equipment compliance to those standards.
Promotes competition and compatibility through standards promoting interoperability such as
GR‐ 303. Telcordia also offers educational and training programs open to all interested parties.
Bellcore was sold to SAIC in 1997. Telcordia is responsive to both RBOCs and independent
Telcos. Their web site is: http://www.telcordia.com . See GR‐ 303
Telephone Number See DN and MSN
Telos Customer Support +1 216.241.7225. Generally available from 9am to 6pm EST, but you
can try at other times. You may also ask for assistance by emailing to support@telos‐
systems.com