Telecom Glossary P1
Parallel Port
An output port on a PC that transmits data eight bits
(one byte) at a time.
Partially Dedicated Access
Long distance carrier access method in which a
non-local call is carried by the long distance
carrier via a dedicated trunk facility for either
the first or last part of the call's journey, and
on the carrier's network for the middle part of
the journey. Also called "dedicated to switched,"
"switched to dedicated," "on-net to off-net" and
"off-net to on-net."
Payphone
A public (or private) telephone that accepts coins
or encoded credit cards.
PBX
PBX (private branch exchange) is a telephone system
within an enterprise that switches calls between
enterprise users on local lines while allowing all
users to share a certain number of external phone
lines. The main purpose of a PBX is to save the cost
of requiring a line for each user to the telephone
company's central office.
The PBX is owned and
operated by the enterprise rather than the telephone
company (which may be a supplier or service provider,
however). Private branch exchanges used analog
technology originally. Today, PBXs use digital
technology (digital signals are converted to analog
for outside calls on the local loop using plain old
telephone service).
A PBX includes:
Telephone trunk (multiple phone) lines
that terminate at the PBX
A computer with memory
that manages the switching of the calls within the PBX
and in and out of it
The network of lines within
the PBX
Usually a console or switchboard for a
human operator
In some situations, alternatives to
a PBX include centrex service (in which a pool of
lines are rented at the phone company's central
office), key telephone systems, and, for very small
enterprises, primary rate Integrated Services Digital
Network. Among the larger manufacturers of PBXs are
Lucent Technologies, Northern Telecom (NORTEL),
Rolm/Siemens, NEC, GTE, Intecom, Fujitsu, Hitachi,
and Mitel.
Long Distance Glossary
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