Appendix D PRI Technical Notes
ViewStation FX/VS 4000 User’s Guide 194 www.polycom.com
D4
A T1 data-framing format, which is no longer widely deployed.
ESF
Extended Superframe Format. A T1 data-framing format.
HDB3
A method of signal encoding used with E1.
Network cable
A standard CAT5 cable with ordinary RJ-45 connectors, which
connects a PRI network interface module to the network.
Network side
The side of a PRI network interface module that connects to an
upstream switch or PBX.
PABX
Private Area Branch Exchange (see PBX).
PBX
Private Branch Exchange.
Peripheral Link
P-LINK. Proprietary serial interface for connecting PRI or V.35
modules to an ViewStation FX or VS4000.
P-LINK
Peripheral link.
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