8 ports connecting to multi-appearance hybrid analog and digital voice terminals. 24 independent trunk connections to a 1.544-Mbps DS1 facility. Each trunk transmits data at 64 kbps common channel or 56 kbps Robbed Bit Signaling. Three types of digital tie trunk interfaces: voice-grade DS1, alternate voice/data (AVD) DS1 tie trunks, and digital-multiplexed interface (DMI). Provides Bit-Oriented Signaling (BOS) on the automatic, immediate-start, delay-dial, and release-link trunks.

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