Telos NX12 User Manual download pdf (Page 113)

GUIDE TO TELEPHONE TERMINOLOGY | 103

You’ll get better results from the Telco if you understand

and speak the lingo! We have tried to include the typical

acronyms used by Telco personnel. We’ve put the deﬁnition

under the most commonly used acronyms.

AMI – Alternate Mark Inversion. A T1 line coding method. is

is the older of the two commonly available. Modiﬁed AMI is also

used on the ISDN S interace. See line coding, T1. See Also B8ZS.

ANI – Automatic Number Identiﬁcation- A system, originally de-

signed for use by Interexchange carriers (IECs), that transmits the

“billed party number” along with a call. Note that the billed party

number is not necessarily the number of the line placing the call.

ANI predates SS7 and can operate with analog as well as digital

trunks. See also CLID and Caller ID.

Asynchronous Data - A form of serial data communication that

is not clocked. To keep the bit stream synchronized, start and stop

bits are added, which cuts down on throughput. RS-232 computer

data is commonly asynchronous data. In contrast to synchronous

data.

Acoustic Echo Canceller (AEC)- When an acoustic path exists

from a microphone to a loudspeaker in a teleconferencing applica-

tion, the far-end participant will hear his voice coming back after a

delay. is echo is annoying and can disrupt conversation. An AEC

is a signal processing function that works to remove this echo.

B Channel - Bearer Channel. One of the multiple user channels

on an ISDN circuit. Used to carry user’s data; i.e. coded audio data

in the case of Zephyr or ZephyrExpress.

B8ZS- Bipolar 8 (with) Zero Substitution. A T1 line coding

method. is is the more modern line coding method of the two

commonly available. See Line Coding, T1. See also AMI

Bearer Channel- See B Channel

Behind the PBX- is is our own term, and refers to when one

privately owned phone system is tied to another privately owned

phone system. e most common application is when a key system

is connected to analog ports of a PBX. When it involves one PBX

behind another, it is a limited Tandem application. See Tandem

Switch and Tandem Tie Trunk Switching below.

Bell Labs. e basic research facility that was AT&T’s primary

research facility. Bell Labs was originally part of Western Electric

and was spun oﬀ with Lucent Technologies when AT&T was

broken up in 1984. Many very important discoveries were made

at Bell Labs including the transistor, communications theory, and

radio astronomy. e future of Bell Labs seems bleak at the time of

this writing.

Bell Operating Company. See BOC. See also RBOC.

Bellcore- BELL COmmunications REsearch. See Telcordia. e

research and development organization owned by the RBOCs.

Bellcore represents the RBOCs in developing standards for Telco

equipment and in testing equipment compliance to those standards.

Bellcore also oﬀers educational and training programs open to all

interested parties. Now Telcordia.

BERT - 1) Bit Error Rate Test- A test for digital lines which in-

volves looping a data path and sending a test pattern. Data return-

ing is compared to the sent data to check for errors. Depending on

the “Test Pattern” used, BERTs may or may not uncover problems.

A line, which only has occasional problems, will need a BERT of

suﬃcient time duration to catch that intermittent problem. A ﬁve

minute BERT of an ISDN BRI circuit will only catch severe prob-

lems. 2) Bit Error Rate Tester. e test equipment used to perform a

Bit Error Rate Test.

Billing Telephone Number- e main phone number which all

calls on hunt group or a PRI are billed to. is information may be

required when conﬁguring a PRI PBX.

Bit Error Rate- e basic measure of errors on digital transmission

paths. It is usually expressed as the number of errors per number of

bits. For example, the allowable bit error rate on a BRI circuit is 1 x

10 E7 (one bit error in 107 bits or 1 error in 10 million bits).

Bit Error Rate Test-See BERT

Bit Rate- e capacity of a digital channel. ISDN calls are set up at

a given bit rate, either 64Kbps or 56Kbps. e bit rate of a circuit-

switched connection cannot be changed during a call. See Kbps.

BLEC- Building Local Exchange Carrier. A LEC who covers

the occupants of a single building (or a small group of buildings)

only. Often Telecom services are provided by a BLEC as a service

Telephone Terminology Guide

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Telos NX12 User Manual Page 113

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