Product Description
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ADTRAN DSX 1
Voice DSP module
1200284L1 1200284-L1 1200284L-1 1200284-L-1 12-00284L1 120-0284L1,
The T3SU 300 has expansion slots for up to three additional DTE interfaces accept optional field-upgradable interface cards. The cards can be HSSI, high-speed V.35, or DSX-1. Each DSX module has four DSX-1 interfaces and three DSX-1 modules can be supported in a chassis. DSX-1 module is designed for voice integration.
ADTRAN DSX 1
Voice DSP module
1200284L1 1200284-L1 1200284L-1 1200284-L-1 12-00284L1 120-0284L1,
The T3SU 300 has expansion slots for up to three additional DTE interfaces accept optional field-upgradable interface cards. The cards can be HSSI, high-speed V.35, or DSX-1. Each DSX module has four DSX-1 interfaces and three DSX-1 modules can be supported in a chassis. DSX-1 module is designed for voice integration.
This is an optional DSX-1 Card. 
