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Lastly an FXO port is included to support emergency calling if PRI circuits and SIP trunks both go down
3 Custom Keys
A full duplex speakerphone is built into the phone that allows for high quality conference calls
The Adtran dual T1 network module
The Adtran octal ISDN BRI/U module is a network WAN module designed for the Atlas 800 series router
Adtran T3SU 300 First Generation 1200217L2 Multiplexers Lastly an FXO port isAdtran T3SU 300 1200217L2 Description: The Adtran T3SU 300 is a high bandwidth CSU DSU that supports an unchannelized T3. The T3SU 300 features a built in HSSI interface and support for three optional modules. The modules can only be used in point to point applications. The modules can support HSSI, V. 35, Ethernet bridge, or Quad DSX 1 modules. The intergrated HSSI interface can support up to a full T3 bandwidth (44. 2 Mbps) through 75 Kbps
