3com NETBuilder II Owner's Manual download pdf (Page 9)

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

(+ side)

Pin Number

(- side)

Direction

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

DCE

14 - 18 39 - 43 out

Signal Ground SG 19 44 --

5 ancillary from

DCE

20 -24 45 - 49 in

Signal Ground SG 25 50 --

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 21 22

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3com NETBuilder II Owner's Manual Page 9

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