Adtran Atlas 800 Series Quad T1 PRI 1200185L3 Phone Systems The 4200321L4 can support PRI

The 4200321L4 can support PRI to T1

The 1204288L1 includes a back-up dial modem for dialed out cry in emergencies

In addition to the SG-50V switch's ability to handle ShoreTel IP phones

2 Ports 1000-Base-SX SFP

The number of B channels available for bonding is from two to 32 channels per processor

Adtran Atlas 800 Series Quad T1 PRI 1200185L3 Phone Systems The 4200321L4 can support PRIAdtran Atlas 800 Series Quad T1 PRI 1200185L3 Description: The Adtran 1200185L3 is a four port T1 PRI module. The 1200185L3 supports independently configurable T1 or PRI connections. The Quad T1 module supports drop and insert, and DACS applications. PRI switching applications and frame relay passthrough are supported with the 1200185L3. Adtran 1200185L3 Features: Supports Drop Insert and 1 0 Digital Access Cross Connect Systems (DACS) applications