:I'm curious as to how CRC errors effect a PRI. I currently have a PRI
:that is taking a few CRC hits every hour... not many, about 1-20 CRC
:errors per hour, possibly just a bit more.
How it affects a pri? Well it reduces your transmission efficiency. CRC
errors are caused when a packet of data didnt pass the error check and the
data had to be sent again. I believe ISDN uses continuous ARQ but I can
check tomorrow.
What is causing the errors? They are pretty random? Could be attenuation,
could be rf interference, could be poor connections on either end. 20 per
houris not too many IMO. You are talking about a retransmission of a maximum
of 20*1500=30000 extra bytes per hour versus a total thruput of a PRI in 1
hour (1.54 mbits/sec max thruput). This ratio of errors to data would be
tiny.. This is unless of course, the errors referred to
are the uncorectable CRC errors where the receiver requested retransmission
from the sender and either never got it or never got a good retransmission
after X amount of times. I would tend to think that the portmaster is
reporting the former and not the latter.
~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._.,-*~
Jake Messinger, VP. ph:713-772-6690 Lucent Dealer
AMS, Inc. fx:713-774-3498 Medical Billing
8300 Bissonnet #400 jake@ams.com , ICQ# 4403734 Internet Services
Houston, Texas 77074 www.ams.com/~jake and Hardware
Adjunct Professor University of Houston, CBA jake@uh.edu
~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._.,-*~
INVENTOR OF the _.,-*~' '~*-,._ SQUIGGLES (c) 1978
-
To unsubscribe, email 'majordomo@livingston.com' with
'unsubscribe portmaster-users' in the body of the message.
Searchable list archive: <URL:http://www.livingston.com/Tech/archive/>