Dc Cable And Connector; Physical Characteristics - Seagate HAWK 4 Series Product Manual

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11.6.1

DC cable and connector

The "W" and "WD" model drives receive DC power through a 4 pin connector mounted at the rear of the main
PCB (see Figure 11.6.-1a). Recommended part numbers of the mating connector are listed below, but equiva-
lent parts may be used (see Table 11.6.1-1).
Type of cable
14 AWG
For "WC/DC" models, the DC power is routed through the SCSI 80 pin I/O connector. Current carrying
capacity is for one drive only, plugged directly into the Host 80 pin I/O connector (no cable). See Tables
11.6.3-1b and 11.6.3-1d for power pin assignments.
11.6.2

Physical characteristics

This section defines the connectors, cables, signals, terminators and bus timing needed to implement SCSI.
11.6.2.1 Physical description
The "W" and "WD" model drives may be daisy-chained with other compatible SCSI devices using the same
type cable. Both ends of the cable must be terminated. The model ST15230W and ST15230WC drives
implement single ended drivers and receivers. The ST15230WD and ST15230DC model drives implement
differential drivers and receivers. All signals are common between all SCSI devices. The drive may be daisy-
chained only with SCSI devices having the same type drivers and receivers. Devices having single ended
interface circuits cannot be on the same daisy-chain with devices having differential interface circuit. A maxi-
mum of 16 SCSI devices (including the Host) may be daisy-chained together. The SCSI Devices at both ends
of the daisy-chain are to be terminated. Intermediate SCSI devices shall not be terminated (see Figure
11.6.3-2). Remove the terminator enable jumper TE, not the terminator power source selector jumper TP
(Figure 10.1-1).
"WC/DC" model drives plug into PCB or bulkhead connectors in the Host. They may be connected in a daisy-
chain by the host backplane wiring or PCB circuit runs that have adequate DC current carrying capacity to
support the number of drives plugged into the PCB or bulkhead connectors. A single 80 pin I/O connector
cannot support the DC current needs of several drives, no daisy-chain cables should be used. A single drive
connected via a cable to a host 80 pin I/O connector is not recommended.
Product Manual - Hawk 4 Family (Wide) SCSI-2 (Volume 1), Rev. E
Table 11.6.1-1. Mating connector parts
Connector
AMP 1-480424-0
Contacts (20-14 AWG)
AMP 60619-4 (Loose Piece)
AMP 61117-4 (Strip)