High-Speed Serial Interface
Encyclopedia
The High-Speed Serial Interface (HSSI) is a differential
ECL
serial interface standard developed by Cisco Systems
and T3plus Networking primarily for use in WAN
router connections. It is capable of speeds up to 52 Mbit/s with cables up to 50 feet in length.
While HSSI uses 50-pin connector physically similar to that used by SCSI-2, it requires a cable with an impedance of 110Ω (as opposed to the 75Ω of a SCSI-2 cable).
The physical layer of the standard is defined by EIA-613 and the electrical layer by EIA-612.
Differential signaling
Differential signaling is a method of transmitting information electrically by means of two complementary signals sent on two separate wires. The technique can be used for both analog signaling, as in some audio systems, and digital signaling, as in RS-422, RS-485, Ethernet , PCI Express and USB...
ECL
Emitter coupled logic
In electronics, emitter-coupled logic , is a logic family that achieves high speed by using an overdriven BJT differential amplifier with single-ended input, whose emitter current is limited to avoid the slow saturation region of transistor operation....
serial interface standard developed by Cisco Systems
Cisco Systems
Cisco Systems, Inc. is an American multinational corporation headquartered in San Jose, California, United States, that designs and sells consumer electronics, networking, voice, and communications technology and services. Cisco has more than 70,000 employees and annual revenue of US$...
and T3plus Networking primarily for use in WAN
Wide area network
A wide area network is a telecommunication network that covers a broad area . Business and government entities utilize WANs to relay data among employees, clients, buyers, and suppliers from various geographical locations...
router connections. It is capable of speeds up to 52 Mbit/s with cables up to 50 feet in length.
While HSSI uses 50-pin connector physically similar to that used by SCSI-2, it requires a cable with an impedance of 110Ω (as opposed to the 75Ω of a SCSI-2 cable).
The physical layer of the standard is defined by EIA-613 and the electrical layer by EIA-612.