Cabling the Hssi Module for Network Connection

Installation 1-5

Installing the HSSI Module

Cabling the HSSI Module for Network Connection

A SCSI-type cable connects the HSSI Module DTE connector to a Data Service Unit (DSU). Table 1-1 describes the connectors. Table 1-2 describes the pin assignments.

3Com recommends using minimum lengths of this cable, especially if you plan to use these serial lines at high speeds. The maximum cable length allowed is 50 feet.

To connect the HSSI module to the network, insert a SCSI type cable into the female connector in the rear of the HSSI module

Table 1-1. Connectors

Connector	Description

Plug connector type	2 row, 50 pin, shielded tab connectors,
	AMP plug part number 749111-4 or equivalent
	AMP shell part number 749193-2 or equivalent
Receptacle type	2 row, 50 pin, receptacle header with rails and latch blocks,
	AMP part number 749075-5 or equivalent

Table 1-2. HSSI Adapter Cable Pinouts

Signal Name	Mnemonic	Pin Number	Pin Number	Direction
		(+ side)	(- side)

Signal Ground	SG	1	26	--
Receive Timing	RT	2	27	in
DCE Available	CA	3	28	in
Receive Data	RD	4	29	in
Loopback Request	LC	5	30	in
Send Timing	ST	6	31	in
Signal Ground	SG	7	32	--
DTE Available	TA	8	33	out
Terminal Timing	TT	9	34	out
Loopback Circuit A	LA	10	35	out
Send Data	SD	11	36	out
Loopback Circuit B	LB	12	37	out
Signal Ground	SG	13	38	--
5 ancillary to		14 - 18	39 - 43	out
DCE
Signal Ground	SG	19	44	--
5 ancillary from		20 -24	45 - 49	in
DCE
Signal Ground	SG	25	50	--

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