Lucent Technologies 555-670-111 Benutzerhandbuch

Issue 1

April 1999

Glossary 

GL-4

 

Difference, expressed in hertz, between the highest and 
lowest frequencies in a range that determines channel 
capacity.

Password used to limit access to the 

Remote Access 

feature of the system. In a 

private network, it is especially 

important that barrier codes be required for all types of 
remote access.

Hardware that holds and connects the 

processor module, 

power supply module, and up to five other modules in the 
system. See also 

.

Strictly speaking, a measurement of transmission speed 
equal to the number of signal level changes per second. In 
practice, often used synonymously with 

bit rate and bps.

Bearer-Channel. 64- or 56-kbps channel that carries a 
variety of digital information streams, such as voice at 
64 kbps, data at up to 64 kbps, wideband voice encoded at 
64 kbps, and voice at less than 64 kbps, alone or 
combined.

See 

See 

.

One of three modes of system operation in which the 
control unit is connected to (behind) another telephone 
switching system, such as 

Centrex or DEFINITY, which 

provides features and services to telephone users. See 
also 

 and 

.

Electrical representation of quantities or symbols 
expressed in the base-2 number system, which includes 
zeros and ones.

See 

.

Digital signal in which pulses (ones) alternate between 
positive and negative. See also 

, and 

.

Condition occurring when two positive or two negative 
pulses are received in succession. See also 

 and 

.

Built-In Speakerphone. Part of the model name of some 
analog multiline telephones.

Binary Digit. One unit of information in binary notation; it 
can have one of two values—zero or one.

Speed at which bits are transmitted, usually expressed in 
bps. Also called “data rate.”