Chapter 4
Installing the Drive
Page 36
Filepro CFP4207 Series
Cabling the Drive - CFP4207S
Connect the SCSI interface cable and the spindle synchronization cable (when
needed) as shown in Figure 4-5.
Figure 4-5
Connecting the cabling
J3
J1
J4
J2
SS
LED
Pin 1 (typically
indicated by a
colored stripe
on the cable
50-pin SCSI
Interface
Key
Spindle
Synchronization
Connection
2107_4_5
4-pin Power
Connector
Pin 1
E8
F1
J7
OE6, LED Connection
LED
Connection
J6
LED
SCSI Bus Cable
The cable and mating connector required to connect the drive to the SCSI bus
are described in Chapter 5. In addition, the cable should meet the following
guidelines, particularly with FAST SCSI-2 systems:
•
Do not route the data cable next to the drive PCB or any other high
frequency or large current switching signals. Improper drive operation can
result from improper cable routing.
•
Cable stubs should not exceed 0.1 meter (4 inches).
•
There should be 0.3 meters (12 inches) of cable between drives.
•
The total cable length should not exceed 6 meters (20 feet) and may have to
be reduced if a mixture of round and flat cable are used.
•
Do not tightly bundle excess flat cable against each other since this promotes
cross coupling of signals on the cable. Use spacers to maintain a minimum of
0.050 inches (1.27mm) gap between cable runs.
•
Do not clamp the cable tightly against a metal chassis since this will degrade
the signal. Use spacers or a non-flammable insulation material to maintain
a gap between the chassis and the cable.
Spindle Synchronization
The spindle rotation of up to 35 drives may be synchronized together by daisy
chaining pin 1 to pin 1 and pin 2 to pin 2 on connector J3. Spindle
Synchronization is enabled by setting the appropriate bits in the RPL field of
Mode Select page 04. Refer to the Eleventh Generation Disk Drive SCSI-2
Interface Manual for a description of the command implementation. The
synchronization tolerance is 1%.