Date: Sat, 9 Aug 1997 21:24:59 +0200 From: j@uriah.heep.sax.de (J Wunsch) To: hackers@FreeBSD.ORG Cc: jamil@counterintelligence.ml.org (Jamil J. Weatherbee) Subject: Re: ISDN drivers/cards Message-ID: <19970809212459.FE61477@uriah.heep.sax.de> In-Reply-To: <Pine.BSF.3.96.970809110647.7721B-100000@counterintelligence.ml.org>; from Jamil J. Weatherbee on Aug 9, 1997 11:12:17 -0700 References: <19970809055307.20710@grendel.IAEhv.nl> <Pine.BSF.3.96.970809110647.7721B-100000@counterintelligence.ml.org>
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As Jamil J. Weatherbee wrote: > My tests hav concluded that the latency > across an isdn connection with a router is about 15ms (30ms ping) where as > with a TA 50ms (100ms) ping is considered good depending on if you are > going from TA to TA or TA to Router, I'd love to see an internal card that > doesn't use 16550's that I can put in my freebsd machine and get good > performance out of The dumb cards based on the Siemens chipset BISDN is currently supporting aren't UART-based either, and here's my ping RTT: j@uriah 1139% /sbin/ping ifb-gw2 PING ifb-gw2.interface-business.de (193.101.57.253): 56 data bytes 64 bytes from 193.101.57.253: icmp_seq=0 ttl=60 time=36.421 ms 64 bytes from 193.101.57.253: icmp_seq=1 ttl=60 time=36.388 ms 64 bytes from 193.101.57.253: icmp_seq=2 ttl=60 time=36.506 ms 64 bytes from 193.101.57.253: icmp_seq=3 ttl=60 time=36.469 ms ^C --- ifb-gw2.interface-business.de ping statistics --- 4 packets transmitted, 4 packets received, 0% packet loss round-trip min/avg/max = 36.388/36.446/36.506 ms Unfortunately, the ISDN landscape in the US is different from Europe. Your Telco's didn't even decide for a single switch protocol yet, nor do they market ISDN as *I*SDN. In the result, you are left alone to buy your network terminator, leading to a situation where most ISDN hardware sold in the US AFAIK is being sold with a builtin NT (thereby defeating the idea of an integrated service, with voice and data connections over the same wire). The cards currently supported by BISDN do IMHO not ship with this feature (remember, these cards are in the region of DEM 100...150, i.e. USD 60...90 -- the NT itself is a multiple of this), nor has anybody volunteered yet to write the protocol layers for your switch protocols. -- cheers, J"org joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-)
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