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Glossary
AMI
BPV
Bridged tap
CD
Champ connector
CO
COM port
CP
CPE
CRC
CTS
CV
DCE
DSR
DSX-1
DTE
DTR
7900-A2-GB20-00
Alternate Mark Inversion. A line coding technique used to accommodate the ones density
requirements of E1 or T1 lines.
Bipolar Violation. In a bipolar signal, a one (mark, pulse) which has the same polarity as its
predecessor.
Any part of the local loop that is not in the direct talking path between the CO and the
service user.
Carrier Detect. A signal indicating that energy exists on the transmission circuit.
Associated with Pin 8 on an EIA-232 interface.
64-pin connector used to connect the E1/T1 network or local loop to the HotWire 7900
Nest connectors J5, J6, and J7.
Central Office/Central Site. The PSTN facility that houses one or more switches serving
local telephone subscribers.
Communications port. A computer's serial communications port used to transmit to and
receive data from a modem. The modem connects directly to this port.
Customer Premises.
Customer Premises Equipment. Terminal equipment on the service user's side of the
telecommunications network interface.
Cyclic Redundancy Check. A mathematical method of confirming the integrity of received
digital data.
Clear to Send. An EIA-lead standard for V.24 circuit CT 106; an output signal
(DCE-to-DTE).
Code Violation. Detected when using HDB3 coding format, this is equivalent to a BPV
when using AMI coding.
Data Communications Equipment. The equipment that provides the functions required to
establish, maintain, and end a connection. It also provides the signal conversion required
for communication between the DTE and the network.
Data Set Ready. A signal from the modem to the DTE that indicates the modem is turned
ON and connected to the DTE.
Digital Signal Cross Connect level 1. An interconnection point for terminals, multiplexers
and transmission facilities.
Data Terminal Equipment. The equipment, such as a computer or terminal, that provides
data in the form of digital signals for transmission.
Data Terminal Ready. A signal from the DTE to the modem, sent via Pin 20 of the
EIA-232 interface (V.24 circuit 108/1, /2), that indicates the DTE is turned ON and
connected to the modem.
March 1998
GL-1
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