Figure 10A. Scsi Daisy Chain Interface Cabling For "Lw" Model Drives - Seagate ST318436LW Product Manual

Barracuda 18XL Product Manual, Rev. A
Recommended mating 80-position PCBA mount connectors:
Straight-in connector
Seagate P/N: 77678703
Amp US P/N: 2-557103-1
or 94-0680-02-1
Amp US P/N: 2-557103-2
or 94-0680-02-2
Amp Japan P/N: 5-175475-9
Right-angle to PCBA connectors
Seagate P/N: 77678559
For additional information call Amp. FAX service at 1-800-522-6752.
"LW" Model
Drive
[6]
SCSI ID 1
[1] Closed-end type 68 pin connector used. Terminator required.
[2] Open end type (in-line application) connector used. No terminator.
[3] Host need not be on the end of the daisy-chain. Another device can be on the end with the terminator, the
host having no terminator.
[4] Total interface cable length must not exceed that specified in ANSI Standard T10/1302D (including host
adapter/initiator). The cable length restriction limits the total number of devices allowed.
[5] SCSI ID7 has highest arbitration priority. For "LW" models, priority is ID7 to ID0, then ID15 to ID8 (ID 8
very lowest).
[6] Last drive on the daisy chain.

Figure 10a. SCSI daisy chain interface cabling for "LW" model drives

Hot plug version (with ground guide-pin)
787311-1
787311-2
Amp US P/N:
[1]
[2]
SCSI ID 0
with polarization
without polarization
2-557101-1 Amp Japan P/N: 5-175474-9
Note. Do not mix drives operating
single-ended with drives
operating differential on the
daisy chain.
Terminator
2 through X
SCSI devices [4]
(check your
adapter for Pin 1 location)
[2]
Pin 1
SCSI ID 7 [5]
[1]
Host Adapter
PCBA
[3]
67