[RndTbl] SCSI cable length
Adam Thompson
athompso at athompso.net
Fri Jul 3 17:02:55 CDT 2015
This https://en.wikipedia.org/wiki/Parallel_SCSI#Comparison_table might
help you narrow it down.
And, quoting Wikipedia:
>
>
> Interoperability[edit
> <https://en.wikipedia.org/w/index.php?title=SCSI_connector&action=edit§ion=10>]
>
> There are adapters between most types of parallel SCSI connector, and
> some companies will manufacture custom cables to guarantee having the
> correct connectors. An adapter from narrow to wide must include
> termination to work properly.
>
> Different SCSI standards use the same SCSI connectors as in HVD and
> LVD SCSI (High Voltage Differential and Low Voltage Differential) .
> HVD uses 15V while LVD uses 3.3V, so connecting an HVD device to an
> LVD host bus adaptor can blow the line drivers on the HBA, likewise an
> HVD HBA connected to an LVD device.
>
> Similarly, connecting a (slow) SE single-ended device onto a (fast)
> LVD SCSI chain will cause the HBA to sync down to the lowest speed.
>
> While interconnectivity of a number of devices may look
> straightforward, there are many pitfalls, and with older SE devices
> the cabling length becomes an issue as signal degrades.
>
-Adam
On 07/03/2015 04:17 PM, Adam Thompson wrote:
> Not 100% sure either, but IIRC LVDS (and just plain differential)
> never had its own connector.
> With the advent of ... Ultra160??? everything was lvds anyway.
> I recall a small handful of devices that could do differential or
> regular based on a jumper or dip switch, over the same connector.
> What's the device?
> -Adam
>
> On July 3, 2015 4:06:19 PM CDT, Trevor Cordes <trevor at tecnopolis.ca>
> wrote:
>
> I have an external SCSI device that I'd like to plug in on a 10-15' cable.
> The device has a standard dense 50-pin 2-row connector. I thought at
> first that meant for sure LVD, but now I'm thinking it just means ultra.
> I need LVD to get over 1.5M cable length, according to spec. LVD lets me
> go to 12M it appears. If it's just ultra then I'm SOL, I guess.
>
> Is there a way to know what signalling this device uses based just on the
> connector? I checked all available interent specs, incl the original
> manual, for the device and *nothing* specifies anything other than "SCSI".
>
> I'm a big SCSI guy, but my memory on the subject is starting to get
> hazy due to disuse...
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