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E1 (PRI ISDN) interface

Hello there

I'm thinking of a solution to connect an E1 ISDN controller (e.g. HFC-E1
http://www.colognechip.com/isdn/controllers/main-hfc-e1.htm) to the ETRAX
The connection itself is surly not a problem but what's about the necessary
processing power?

Will there be enough capacity to run the ISDN protocol stack?
Are there also some reserves to process the B-channels (e.g. for unrestricted
data or eventually VoIP)

Any idea or information is highly welcome.

Kind Regards
Willi Baertsch

PS: This is a resent mail because it didn't show up in the mailing list.