Telos NX12 User Manual download pdf (Page 122)

112 | Appendix 2

DS0’s). e 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. e electronic interface between an ISDN

device and the NT1. e terminal adapter handles the dialing func-

tions 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 dis-

tance 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 assignment 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.

Telcordia Technologies- Formerly Bellcore. e 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. eir web site is: http://

www.telcordia.com.

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 [email protected]

Telos Test Line(Xstream, Zephyr & ZephyrExpress)- 24 Hour

test line 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. e test line transmits in dual/mono mode

at 32KHz and can be received in L3 Mono using one B channel or

L3 Stereo using 2 B channels. Telos also maintains an identically

conﬁgured test line in Freising, Germany at 49 81 61 42 061 (dial

this number twice).

Terminal Adapter- See TA

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 - e user side of a PBX. e side of the switch that

the telephones are attached. Also, occasionally called the ‘line side’.

e 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 band-

width of a Telco channel. Data is divided into packets, which is sent

on the channel when there is space available. is is the key to the

Internet.

Subscriber- e customer of a Telecommunications company. is

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 Tele-

com model “DMS-100”, or Siemens model “EWSD”. e switch,

and related software running on it, will determine which ISDN

protocol(s) will be available to customers connected to it. See also

PBX.

Switched Circuit- A channel which is not permanent in nature, but

is connected through a switching device of some kind. e switch-

ing 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.

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. is 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

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