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PBX
483
Administration for Network Connectivity
555-233-504 — Issue 1 — April 2000 CID: 77730
Glossary
PBX
Private Branch Exchange: a customer-owned telephone switch that connects a
company’s internal telephone network with the local telephone service
provider’s central office. Lucent’s DEFINITY PBX is a good example.
PDM
See processor data module (PDM).
PGATE
Packet gateway.
Point-to-Point Protocol
A TCP/IP implementation tailored for use over telephone lines. It supports
router-to-router and host-to-network connections over both synchronous and
asynchronous circuits. PPP replaces SLIP, the older Serial Line Interface
Protocol.
Port
(1) Interface between an application and the TCP/IP network. A port is a
predefined internal address (port number) that serves as a pathway from the
application to the Transport layer (or from T to A). (2) circuit-pack port.
PPP
See Point-to-Point Protocol.
PRI
Primary Rate Interface. See ISDN.
Primary Rate Interface
See ISDN.
private network
A network used exclusively for the telecommunications needs of a particular
customer.
private network office code (RNX)
The first three digits of a 7-digit private network number.
processor data module (PDM)
A device that provides an RS-232C DCE interface for connecting to data
terminals, applications processors (APs), and host computers, and provides a
DCP interface for connection to a communications system.