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Appendix D. Glossary
61200217L1-1 T3SU 300 User Manual D-7
idle code
In a T3 circuit, an idle code consists of a sequence of 1100 over the entire payload
bandwidth.
in-band
Signaling (dialing, diagnostics, management, configuration, etc.) over the same
channel used for data.
IP
internet protocol. A protocol which provides for transmitting blocks of data
between hosts identified by fixed-length addresses.
LAN
local area network. A privately owned network that offers high-speed communi-
cations channels to connect information processing equipment in a limited geo-
graphic area.
local loopback (LL)
A type of test used to verify the operation of the local terminal equipment, the
CSU, and the connection between the two. The signal from the DTE is looped
back by the CSU and is sent back to the DTE.
loopback
The technique for testing the processing circuitry of a communications device.
May be initiated locally or remotely via a telecommunications circuit. Device
being tested will echo back received test data. The results are compared with the
original data.
LOS
loss of signal. Defined as a line state in which no pulses are received for 175 bit
positions.
M13
DS1/DS3 multiplexer that combines up to 28 DS1 channels into one DS3 chan-
nel. Uses two-stage, bit synchronous TDM.
Mbps
Megabits per second (one million bits per second).