Provides interface for 3 standard loop-start CO trunks- Equipped with 1 8-conductor interface jack- Must be installed on 082U, 008U, or 000U Cards- Max 1 daughter board per 082U, 008U, or 000U- Max of 4 can be installed in each Chassis Main & Exp- Max of 12 can be installed per system- There is no Power Failure Transfer circuitry
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