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The 1200312L5 is only supported in Adtran Atlas 550 gateways
24 Ports 10/100/1000 RJ-45
Adtran Atlas 550 4 Channel Voice Compression Module 1200312L5 Description:
The phone included LEDs that let you know the status of each line programmed into the phone
The Adtran 1200755L2 provides four T1 or PRI interfaces to an Adtran Atlas 550
Adtran Atlas 800 Series 32-Channel Voice Compression Module 1200221L4 Multiplexers The 1200312L5 is only supportedAtlas 800 Series 32 Channel Voice Compression Module 1200221L4 Description: The Adtran 1200221L4 is a 32 channel voice compression module for Atlas 800 series gateways. The 1200221L4 supports G. 723. 1 compression on 32 B channels from multiple T1 or PRI circuits. With 6: 1 compression ratio compared to traditional G. 711 conversations, the 1200221L4 can support up to an extra 160 calls across the 8 channels (192 total). The 1200221L4 supports fax
