AT&T System 85 manual Adjunct Power

ADJUNCT POWER

ADJUNCT POWER

Power for several of the adjuncts must be provided locally at the voice terminal or from a satellite closet through the terminal wiring. The following power supplies are currently recommended:

The MSP-1 (WP92464L1) Power Supply—replaces the KS-22911 L1/2, 329A, and 353A DC power supplies and the 2012D AC transformer. The MSP-1 can be used to supply local power to ISDN-T 65xx, 75xx, and 85xx series voice terminals connected to an AT&T DEFINITY Communications System and to the DCP 7444 and 8434 voice termi- nals which need auxiliary power for their vacuum fluorescent displays. The MSP-1 can also supply auxiliary power to adjunct equipment such as the S201A and CS201A speak- erphones or a 500A Headset Adapter attached to any currently manufactured analog, DCP, or ISDN-T voice terminal equipped with an Adjunct jack. For more information on the MSP-1 power supply, see the short section with connection diagrams later in this section.

The ISDN 1145B1 Bulk Power Unit, 1146B Power Distribution Unit, and the 2.5/5.0 A.H. back-up batteries provide an uninterruptible power source for ISDN telephones and ter- minals, NT1s, terminal adjuncts, and other customer premises equipment. During AC power interruptions, batteries are automatically switched on to provide continuous power to the load.

The distribution of power to the terminal equipment is provided by the 1146B distribution unit. The 1146B provides 32 standard 110 connections to the load with overcurrent pro- tection and alarm lights. The 1145B1/1146B power arrangement is compact (measuring only 6.5 inches deep), lightweight, plastic enclosed, and designed for easy wall- or rack- mounting.

During normal operation, the power supply/charger provides DC power to the load via the distribution unit while maintaining the battery in a fully charged condition. The power sys- tem continuously monitors systems conditions with the status displayed on the front panel of the power supply and distribution unit.

The following power supplies and transformers are NO LONGER recommended. They have been replaced by the MSP-1 power supply and the 1145B1 bulk power unit described above.

2012D AC transformer— can be used locally or in a satellite closet to power a single 18 volt headset adapter or speakerphone.

KS-22911, L2 DC power supply—can be used locally or in a satellite closet to power a headset adapter or speakerphone plus one additional adjunct. This unit has a 48 volt power output of 10 watts.

KS-21239, L4, L5 AC transformer—can be used locally or in a satellite closet to power a single 24 volt speakerphone-dialer.

PS3081096 AC transformer—can be used locally or in a satellite closet to power the 24 V S201A or S203A speakerphones.

329A DC power supply—can be used locally or in a satellite closet and is capable of sup- plying power to any number of adjuncts that may be added to a digital voice terminal. This unit has a power output of 25 watts.

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