Specifications

The 8400 Series Voice Terminals
12-26 Issue 11 December 1999
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 8405 voice terminal receives power from the system and does not require
any external power supply. Additional external power IS required when the 8405
voice terminal is equipped with any adjuncts, such as an external speakerphone.
In this instance, a 1151A1 local power supply or a 1151A2 power supply with
Battery Holdover is recommended. Refer to the Adjunct Power section earlier in
this manual for more information on these power supplies.
Table 12-7. Circuit Packs Used with the 8400-Series Voice Terminals
Circuit Pack 2/4-Wire Will support these switches
TN2181 - 16-port 2-wire G3V2 and later
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