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Unit Loads
A cabinet can supply no more than 80 unit loads of 48 volt power (a unit load is defined as
44 mA). Unit loading is determined by the terminal connected to the port circuits. The
following table lists unit loads for various terminals.
UNIT LOADS (Note)
EQUIPMENT
CIRCUIT UNIT LOAD
PACK PER PORT
2500 Voice Terminals
ZTN78
0.5
7101A Voice Terminal
TN742 1.0
MET Sets
TN735 1.0
5-Btn. (7302H01D)
ZTN79
1.0
10-Btn. (7303 H01D)
1.0
34-Btn. (7305 H01D)
1.0
HFAI (7309 H01B)
1.0
BIS (7305 H03B)
ZTN79 1.50
BIS w/display (7305H04C)
ZTN79
2.00
34-Btn. Deluxe
ZTN79
2.0
(7305 H02D)
S102A Speakerphone
ZTN79
1.0
502A Headset Adapter
ZTN79
0.75
Asynchronous Data Units
TN726
0.0
Tie Trunks TN760B 2.0
DID Trunks
TN753
0.5
Emergency Transfer Unit ZTN82/128 2 per ETU
Pooled Modem TN758 Zero Unit Loads but
maximum of two
TN758s/cabinet
allowed.
DXS Selector Console
Locally Powered
Note: Equipment not listed above (i.e.,
TN763, ZTN76, ZTN77) does not affect unit
loading. Any voice terminal/adjunct combination requiring more than 2 Unit Loads
must be locally powered. When a voice terminal is locally powered, it places no unit
load on the cabinet.
Specifically, a 34-Button Deluxe voice terminal equipped for
speakerphone operation requires auxiliary power. In addition, any 34-Button Deluxe,
BIS, or BIS with Display voice terminal equipped for headset operation requires
auxiliary power.
5-5