On Mon, 12 Aug 2002, Andy wrote:
56K-Only ISDN =============
While it didn't work on the 3Com stuff at the time (quads), there were plenty of folks doing the "IDSN over CT1" dance where we used to co-lo our dial stuff. ATT/TCG was the carrier, switch was a 5E. The only successful ones I knew of were those running the portmaster 3's. Just another datapoint to digest. :) Charles
The industry calls this "Fractional PRI". Customers can use 'digital switch service' to set this up on their end, although he doesn't know any customer that has done it.
D-Channel ISDN ==============
Last he heard, this standard failed because the D-Channel control information (although very very small) was not protected in the protocol. If the IP data caused a single control token to error out, the connection drops.
He is unaware if this was eventually solved.
I look forward to any extra insight on these two ISDN layouts.
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