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

--

 

 

 

 

 

 

 

Page 9
Image 9
3Com NETBuilder II manual Cabling the Hssi Module for Network Connection

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