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From: berger@datacube.UUCP
Newsgroups: comp.arch
Subject: Re: *-VME bus repeaters
Message-ID: <101200007@datacube>
Date: Wed, 2-Dec-87 14:11:00 EST
Article-I.D.: datacube.101200007
Posted: Wed Dec  2 14:11:00 1987
Date-Received: Sun, 6-Dec-87 23:54:11 EST
References: <1524@mmm.UUCP>
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Nf-ID: #R:mmm.UUCP:-152400:datacube:101200007:000:1094
Nf-From: datacube.UUCP!berger    Dec  2 14:11:00 1987


We have had some very good luck with the HVE-2000. This is a true
A32/D32 bus extender.  The Performance Tech 902A also works very well.

They are both higher performance than the Bit 3 since they both support
A32/D32 and the Bit 3 is only A24/D16.

The HVE-2000 is literally twice as fast as the PT-902A in terms
of data transfers. The main drawback is that you must use special
cables supplied by HVE. These cables must be continuous between
the two ends, you can not have intermediate bulkhead connectors.

The PT-902A is half the speed of the HVE because it actually
recreates the VME bus Master and must reclock all the signals adding
a significant prop delay. This has one advantage in that you can 
electronically decouple crates. Also the PT-902A uses 4 50pin normal
ribbon cables so cabling is a bit easier.

				Bob Berger 

Datacube Inc. Systems / Software Group	4 Dearborn Rd. Peabody, Ma 01960
VOICE:	617-535-6644;	FAX: (617) 535-5643;  TWX: (710) 347-0125
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