1HSSI and SCSI2

JeanM

Hi,

Can standard SCSI2 male to male 50 pin cable be used with 1HSSI Cisco modules, or does Cisco use the same SCSI2 connectors but the cables internally are different (pins)?

I googled it, but this isn't exactly clear...are the pin-outs / wiring different or the same? I've been trying to use a SCSI2 cable but the link won't go up....


http://docwiki.cisco.com/wiki/High-Speed_Serial_Interface

Summary HSSI is an interface technology that was developed by Cisco Systems and T3plus Networking in the late 1990s to fill the need for a high-speed data communication solution over WAN links. It uses differential emitter-coupled logic (ECL), which provides high-speed data transfer with low noise levels. HSSI pin connectors are significantly smaller than pin connectors for competing technologies. The HSSI cable uses the same number of pins and wires as the Small Computer Systems Interface 2 (SCSI-2) cable, but its electrical specification is more concise. HSSI makes bandwidth resources easy to allocate, making T3 and other broadband services available and affordable. HSSI requires the presence of only two control signals, making it highly reliable because there are fewer circuits that can fail. HSSI performs four loopback tests for reliability.


Thanks!

JeanM

I think they ARE different -

CAB-HNUL pins -
Installing High-Speed Serial Interface Cables  [Cisco 4000 Series Routers] - Cisco Systems

SCSI2 hd50 pins -
http://www.systerra.de/documents/TA107%20UM.pdf