Instruction manual

TECHNICAL SPECIFICATIONS
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
7100 Voice Terminals
TN742
1.0
MET Sets (10 Btn.)
TN735 1.0
MET Set (12 Btn.)
TN735
2.0
5-Btn. (7302H01D) ZTN79
1.0
10-Btn. (7303H01D)
1.0
34-Btn. (7305H01D)
1.0
HFAI (7309H01B)
1.0
ATL Cordless Telephone
1.0
BIS (7305H03B)
ZTN79
1.50
BIS w/display (7305H04C)
ZTN79 2.00
34-Btn. Deluxe (7305H02D) ZTN79
2.0
BIS-10 (7313H01A)
ZTN79
1.2
BIS-Z (7314H01A)
2.0
BIS-34 (7316H01A)
2.0
BIS-34D (7317H01A)
2.0
S102A Speakerphone
ZTN79
1.0
502B Headset Adapter ZTN79
0.8
Asynchronous Data Units
TN726 0.0
Tie Trunks
TN760B
2.0
DID Trunks
TN753 0.5
Emergency Transfer Unit
ZTN142 2 per ETU
Pooled Modem TN758 0.0*
DS1 Interface
TN767 0.0
DXS Selector Console
Locally Powered
5-6
* Zero Unit Loads but maximum of two TN758s per cabinet allowed.
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 22- or 34-Button Deluxe, BIS, or BIS with Display voice terminal equipped for headset
operation requires auxiliary power.
November 1995