
Glossary
511 | A random bit test 511 bytes in length. |
AMI | Alternate Mark Inversion. A line coding technique used to accommodate the ones density |
| requirements of E1 or T1 lines. |
ATI | Asynchronous Terminal Interface. A |
| configuring and managing the termination unit. |
BPV | Bipolar Violation. In a bipolar signal, a one (mark, pulse) which has the same polarity as its |
| predecessor. |
bridged tap | Any part of the local loop that is not in the direct talking path between the CO and the |
| service user. |
CD | Carrier Detect. The received line signal detector. V.24 circuit 109. |
CO | Central Office/Central Site. The PSTN facility that houses one or more switches serving |
| local telephone subscribers. |
COM port | 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. |
CP | Customer Premises. |
CPE | Customer Premises Equipment. Terminal equipment on the service user's side of the |
| telecommunications network interface. |
CPU | Central Processing Unit. The main or only computing device in a data processing system. |
CRC | Cyclic Redundancy Check. A mathematical method of confirming the integrity of received |
| digital data. |
CTS | Clear To Send. A signal indicating that the device is ready for the DTE to transmit data. |
| Usually occurs in response to Request To Send (RTS). |
CV | Code Violation. Detected when using HDB3 coding format, this is equivalent to a BPV |
| when using AMI coding. |
DCE | 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. |
DCLB | Data Channel LoopBack. Loops the data received from the network interface, for all DS0 |
| channels allocated to the selected port, back to the network. |
DSL | Digital Subscriber Line. The |
| customer and the first node within the network. |
DSLAM | Digital Subscriber Line Access Multiplexer. A platform for DSL modems that provides |
| |
DSR | Data Set Ready. A signal from the modem to the DTE that indicates the modem is turned |
| ON and connected to the DTE. |
DTE | Data Terminal Equipment. The equipment, such as a computer or terminal, that provides |
| data in the form of digital signals for transmission. |
September 1998 |
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