AT&T 518-600-016 manual Installing the Control Unit

Supply Module and allows the carrier to support an additional 20 unit loads. With an Auxiliary Power Unit, a single carrier MERLIN II system can add accessories without the expense of an expansion carrier. Refer to Table 2-8for the approximate unit load requirements for the equipment listed.

NOTE: Only voice terminals and accessories that connect to an analog port have unit loads. Any equipment with its own power supply does not have to be included in the unit load calculation.

The unit load requirements in the table assume the following conditions:

●A “unit load” is defined as a measure of power equaling 44 milliamperes (mA) at 43 volts (under load).

●A maximum of 1000 feet of wire for each voice terminal.

●Above average use of voice terminals and accessories.

●Full volume on each voice terminal speaker.

To determine the total unit load, follow these steps:

1Make a list of all voice terminals and accessories that are intended for use with the system.

2Refer to Table 2-8to find the unit load for each voice terminal and accessory you have listed. The equipment listed in Table 2-8includes all the items that will affect a MERLIN II system unit load requirement. Do not include items such as the Display Console or modems because they have their own

power supply and do not affect the system’s power requirements.

2-58 Installing the Control Unit