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HSSI (High-Speed Serial Interface)

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The HSSI (High-Speed Serial Interface) is a high-speed interface for connecting routers and multiplexers to high-speed communication services, such as frame relay and ATM. Cisco and T3plus Networking developed the protocol, but it is freely available for use.

HSSI has a synchronous data rate of up to 52 Mbits/sec, which allows support of T3 WAN connections. Maximum cable length is 50 feet over shielded twisted-pair wire. Many vendors now integrate this interface onto their router and multiplexer devices in place of serial interfaces such as V.35 and EIA-530 (EIA-422). Not only does it operate at much higher data rates, it also has superior flow control and additional loopback capability. The EIA-530 interface has a maximum data rate of about 10 Mbits/sec over short distances, and V.35 is even slower.

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