TELOS TWOX12 USER’S MANUAL
GLOSSARY OF TELEPHONE TERMINOLOGY
APPENDIX 4 198
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. Switched-56 is being rapidly replaced with ISDN, which
is cheaper and more flexible. See also CSU/DSU.
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-1
- An alternative expression for T1. See T1.
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.
TA
- 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 which lights to indicate presence of this signal.
Telco
- Telephone Company. Your local telephone service provider. In the 21
st
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
(Zephyr, TWO, TWOx12)- The menu selection where the ISDN
protocol is selected. Choices are Natl I-1 (for National ISDN and DMS-100 Custom
Functional ISDN), AT&T Cust or PTP (for AT&T Custom Point-to-Point), 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. 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 .
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
Telos Test Line
(Zephyr & ZephyrExpress)- 24 Hour testline which can be called to
verify correct operation of your Zephyr or ZephyrExpress codec. Numbers are +1 216-
781-9310 and +1 216-781-9311. The test line transmits in dual/mono mode at 32KHz
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