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 | |
|
|
|
|
|
| ||
|
| (7302H01D) | ZTN79 | 1.0 | |||
|
|
| 1.0 | ||||
|
|
| 1.0 | ||||
|
| HFAI (7309 H01B) |
| 1.0 | |||
|
|
|
|
| |||
|
| BIS (7305 H03B) | ZTN79 | 1.50 | |||
|
| BIS | w/display | (7305H04C) | ZTN79 | 2.00 | |
|
|
|
|
| |||
|
| ZTN79 | 2.0 | ||||
|
| (7305 H02D) |
|
|
| ||
|
|
|
|
| |||
|
|
| ZTN79 | 1.0 | |||
|
| S102A Speakerphone | |||||
|
|
|
|
|
|
| |
|
| 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
5 - 5