2. HARDWARE SETUP
DC-390 Series User’s Manual
14
14
2.5 Cable Connection
Model #
External
Internal
DC-390
CN1
: 50-pin; 8-bit (Female)
CN2
: 50-pin; 8-bit (Male)
DC-390U
CN1
: 50-pin; 8-bit (Female)
CN2
: 50-pin; 8-bit (Male)
DC-390F
*
CN1
: 68-pin; 16-bit
(wide, Female)
CN2
: 68-pin; 16-bit (wide, Female)
CN3
: 50-pin; 8-bit (Male)
DC-390U2B
J1
: 68-pin; 16-bit
(wide Ultra2, Female)
J2
: 68-pin; 16-bit
(wide Ultra2, Female)
DC-390U2W
J2
: 68-pin; 16-bit
(wide Ultra2, Female)
CN1
: 50-pin; 8-bit (Male)
CN2
: 68-pin; 16-bit (wide, Female)
J1
: 68-pin; 16-bit (wide Ultra2,
Female)
* Only two of the three connectors can be used to connect SCSI devices at the same
time.
External SCSI connector:
This high density D-type SCSI connector is for connecting
external SCSI devices.
Internal SCSI connector:
The internal flat cable should connect to the internal SCSI
connector with its colored stripe, normally red, aligned with Pin 1 of the connector.
Maximum length
of the SCSI bus is determined by the number of devices and the data
transfer rate. The following table summarizes the maximum allowable cable lengths for the
DC-390 series:
Model #
SCSI Type
Data Xfer
Rate
Max. # of
Devices
Max. Cable Length
DC-390
SCSI-2
10 MB/Sec
8
3 meters (9.8 feet)
DC-390U/F
Ultra SCSI
20/40 MB/Sec
4
3meters (9.8 feet)
DC-390U/F
Ultra SCSI
20/40 MB/Sec
8
1.5 meters (4.9 feet)
DC-
390U2B/U2W
Wide Ultra2
SCSI
80 MB/Sec
16
12.5 meters (41 feet)
•
If there are internal devices connected, the internal cable length must be included in
the measurement of SCSI bus length.
•
For DC-390U2B,
mixing Fast/Ultra devices with Ultra2 devices brings the entire SCSI
bus to Ultra SCSI speed and cable requirements.
•
For DC-390U2W
, it is recommended that you keep your Ultra2 devices on connectors J1
and J2, non Ultra2 devices on CN1 and CN2.
Mixing Ultra2 devices with non Ultra2
devices will bring the Ultra2 devices to Ultra SCSI performance level
.
