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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.
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