148
Installing and Wiring Telephones
October 2002
Three-Pair and Four-Pair Modularity
‘‘3-Pair and 4-Pair Modularity’’ on page 149
is from the port circuit pack to the voice or data
terminal.
Most terminals connect to an information outlet (modular jack) installed at the work location.
Make the connections from the port circuit pack to the modular jacks, as shown in ‘‘3-Pair and
4-Pair Modularity’’ on page 149. Then plug the terminal into the modular jack.
‘‘Adjunct Power Connection Locations’’ on page 149
shows three methods of connecting
adjunct power.
5RPXTNo
Connection
4-pin
modular jack
R
6 PXR TXR
7 -48VDC (-48VDC) (-48VDC) -48VDC
8 GRD GRD GRD GRD
Circuit
Pack
TN754C
4-wire
digital
(8 port)
TN2181
2-wire digital
(16 port)
TN2224
2-wire digital
(24 port)
TN556D
ISDN-BRI
line
TN2183
Analog line
(16 port)
TN2198
2-wire BRI
line
PX PBX transmit T Tip (A)
TX Terminal transmit R Ring (B)
Port Circuit Pack and Telephone Pin Designations — Continued
Pin on
Modular
Plug
4-wire:
8400-Series,
606A1
2-wire: 302D,
8400-Series,
603E
8510T BRI
(with adjunct
speaker
phone)
Analog
Station,
Modem
NT1
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