Glossary
GL-6 7112-A2-GB20-20
March 1998
A CCITT standard for a low-speed, 25-position, DCE/DTE interface.
ITU-T standard for a high-speed, 34-pin, DCE/DTE interface.
A CCITT standard for local and remote diagnostic loopback tests.
Wide Area Network. A network that operates over long distances and spans a relatively
large geographic area (e.g., a country).
An outgoing signal transmitted when a DS1 terminal has determined that it has lost the
incoming signal.
A test pattern consisting of a one (1) followed by seven zeros (on the network only).
A pseudo-random bit sequence that is 511 bits long (on the data ports only).
V.24
V.35
V.54
WAN
Yellow Alarm
1-in-8 pattern
511 pattern