Installation manual

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Like the MLS-CA24, the CA48 requires a power supply.
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The MLC-6 cordless phone was designed for Partner:
The AT&T MLC-6 cordless telephone is compatible with your
PARTNER™ Plus or PARTNER Communications System. It gives
you the freedom of a cordless phone while providing the same
features as a corded MLS™-model telephone.
The MLC-6 cordless phone is functionally similar to the MLS-6™
corded phone. The cordless phone can be programmed with system
features and dialing restrictions the same as any other MLS-model
phone.
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It’s a stand-alone cordless system with base station and handset, similar to
home cordless phones of the same era. 10 radio channels are available,
allowing at most 10 different sets in the same office. AT&T recommended,
however, assigning multiple channels to fewer than 10 handsets to get better
coverage.
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From the manual.