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DEFINITYEnterpriseCommunicationsServerandSystem75andSystem85
Terminals and Adjuncts Reference
555-015-201
Issue 11
December 1999
The 8400 Series Voice Terminals
12-84The 8434 and 8434DX Voice Terminals
12
In order for the terminal to function properly in either 2-wire or 4-wire
installations, there must be NO INTERCONNECTIONS between the wire
pairs used for 2-wire and 4-wire operations. Bridging or paralleling of these
pairs can result in damage to the terminal or can cause the PBX circuit pack
to remove power to the terminal.
REMOVE ALL CONNECTIONS BETWEEN PAIRS BEFORE
CONNECTING THE TERMINAL.
4-WIRE installations MUST ONLY have PBX connections on pair 2 and pair
3 and, if necessary, auxiliary power must be connected to pair 4.
2-WIRE installations MUST ONLY have PBX connections on pair 1 and, if
necessary, auxiliary power must be connected to pair 4.
Distance Limitations
The following circuit packs can be used with all of the 8400-Series sets.
In 4-wire operation, the voice terminal must be within 5,000 feet of the PBX using
22-gauge or 24-gauge wire, and within 4,000 feet of the PBX using 26-gauge wire.
In 2-wire operation, the voice terminal must be within 5,500 feet of the PBX using
22-gauge wire, within 3,500 feet of the PBX using 24-gauge wire, and within 2,200
feet of the PBX using 26-gauge wire.
Power Requirements
The 8434 and 8434DX voice terminals are phantom-powered from the system
cabinet on the digital pairs of the line wiring.
In order to use the display on the 8434 or 8434DX voice terminal or, with the
8434DX, connect and use an 801A expansion module, you must connect an
auxiliary power source to the voice terminal. Recommended local power supplies
Table 12-27. Circuit Packs Used with the 8400-Series Voice Terminals
Circuit Pack 2/4-Wire Will support these switches
TN2181 - 16-port 2-wire G3V3, G3V2
TN754b - 8-port 4-wire All switches except System 85
TN754 - 8-port 4-wire All switches except System 85
TN413 - 8-port 4-wire International System 75
SN 270 and
SN 270B - 4-port
4-wire System 85 R2V2 - R2V4