Polycom EX, FX, VS4000, EX4000, FX4000, VS4000 manual Pots

	Chapter 1 - About this Manual
NFAS	Non-Facility Associated Signalling.
NT-1	Network Termination type 1. The device that
	converts the ISDN BRI U interface from the
	telecommunications service provider to the S/T
	interface used by ISDN products and systems.
Pan	Move the camera to the left or right.
PBX	Private Branch eXchange. A private telephone
	switching system connected to common lines
	from one or more central offices. Most PBXs allow
	analog extensions on the system, allowing access
	to special features such as conferencing and
	transferring to analog devices. If you are using a
	telephone connected to a PBX, typically you will
	be required to dial 9 to gain access to an outside
	line.
Peripheral	The portion of a network interface module that
side	connects to the videoconferencing system. See
	also Downstream.
Point-to-point	A call between two sites.
call
POTS	Plain Old Telephone Service. See PSTN.
PRI	Primary Rate Interface.
Private Branch	See PBX.
Exchange
PSTN	Public Switched Telephone Network. The voice
	telephone network accessible to all those with
	telephones and access privileges.
PTZ	Pan/Tilt/Zoom. Describes the cameras supplied
	as part of the ViewStation EX, ViewStation FX,
	and VS4000 systems.
QCIF	Quarter CIF (Common Intermediate Format). A
	video format providing resolution of 176 x 144
	pixels. See also CIF, 4CIF, 16CIF.

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