24
Viper 200 LTO Product Manual
Data transfer methods and rates
Interface Mode
Asyn-
chronous
Fast-5
Fast-10
Ultra/
Fast-20
Ultra2/
Fast-40
SE
Yes
Yes
Yes
Yes
No
LVD
Yes
Yes
Yes
Yes
Yes
HVD
Yes
Yes
Yes
Yes
No
8-bit transfer rate
(Mbytes/second)
-
5
10
20
40
16-bit transfer rate
(Mbytes/second)
-
10
20
40
80
Cabling and connectors
Internal drive
Cabling
Use a 68-pin, flat cable with a maximum length of 6 meters (19 feet) to connect the
drives to the SCSI host adapter. If twisted-pair cabling is used, connect the twisted
pairs to physically opposing contacts on the connector.
A SCSI standard stub no greater than 0.1 meter should be used off the mainline
connection within any connected equipment. The cable’s characteristic impedance
should be between 90 ohms and 140 ohms. A cable with characteristic impedance of
greater than 100 ohms is recommended. To minimize noise and ensure even
distribution of terminator power, the minimum recommended conductor size is 28
AWG (0.08042 mm
2
).
Connectors
Viper drives use a 68 pin, non-shielded connector, alternative 3.
Interface voltages
VTERM : 4.25 to 5.25
CURRENT : 1.5A minimum, 2.0A maximum
External drive
The external drive provides two 68-pin, shielded connectors (ANSI Alternative 2) on
the rear panel of the drive. These connectors consist of two rows of ribbon contacts
spaced 2.16 mm (0.085 in) apart.
These two connectors facilitate adding the drive to a daisy-chain configuration. Either
connector is a SCSI IN connection; the other is a SCSI OUT connection. When the
drive is the last device in the chain (or the only device), an external terminator is
plugged in the SCSI OUT connector.
