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Overview 1-9

HSSI Null Modem Cable

the same 50-pin connectors as the HSSI cable, but uses the pinout listed in Table 1-3. (For

connection and conﬁguration instructions, see the “Attaching a Null Modem Cable to PA-H HSSI

Port Adapters” section on page 8-2.)

Figure 1-12 Null Modem Cable Connectors

Table 1-3 HSSI Null Modem Cable Pinout

Caution

Although the HSSI connector and the HSSI cable are similar to SCSI-II format, they are

not identical. The HSSI cable speciﬁcation is more stringent than that for the SCSI-II. If a SCSI-II

cable is used instead of a HSSI cable, proper operation cannot be guaranteed.

Signal Name From Pins Direction To Pins Signal Name

RT (Receive Timing) 2, 27 —> 9, 34 TT (Terminal Timing)

CA (DCE available) 3, 28 —> 8, 33 TA (DTE Available)

RD (Receive Data) 4, 29 —> 11, 36 SD (Send Data)

LC (Loopback C) 5, 30 —> 10, 35 LA (Loopback A)

ST (Send Timing) 6, 31 —> 6, 31 ST (Send Timing)

TA (DTE available) 8, 33 —> 3, 28 CA (DCE Available)

TT (Terminal Timing) 9, 34 —> 2, 27 RT (Receive Timing)

LA (Loopback A) 10, 35 —> 5, 30 LC (Loopback C)

SD (Send Data) 11, 36 —> 4, 29 RD (Receive Data)

GND (Ground) 1, 26,

7, 32,

13, 38,

19, 44,

25, 50

1, 26,

7, 32,

13, 38,

19, 44,

25, 50

GND (Ground)

Loopback (not

connected)

12, 37 12, 37 Loopback (not connected)

Not used 14–18,

20–24,

39–43, 45–49

14–18,

20–24,

39–43, 45–49

Not used

H5692

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 71 72

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