From: Church, Chuck (cchurch@netcogov.com)
Date: Fri May 13 2005 - 11:32:41 GMT-3
Here are a couple different resources involving the subject:
http://www.tamos.net/~rhay/wp/overhead/overhead.htm
http://www.protocols.com/pbook/bridge.htm#CISCOROUTER
So you're comparing 38 bytes of overhead with Ethernet to 4 bytes with
HDLC. Both support full duplex, so that's not an issue. It really
depends on the traffic. If you're doing all VoIP over the link with
tiny frames, HDLC is much better. But if it's all large frames,
Ethernet will come close. But the downsides to serial are much more
expensive hardware, and no easy way to insert a (sniffer/firewall/QOS
device). You could always offer the customer 33mb at the 30mb price to
account for protocol overhead...
Chuck Church
Lead Design Engineer
CCIE #8776, MCNE, MCSE
Netco Government Services - Design & Implementation
1210 N. Parker Rd.
Greenville, SC 29609
Home office: 864-335-9473
Cell: 703-819-3495
cchurch@netcogov.com
PGP key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x4371A48D
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Revaz Kashia
Sent: Friday, May 13, 2005 6:35 AM
To: ccielab@groupstudy.com
Subject: Ethernet vs. Serial
Maybe this question sounds strange but I would like to get some advice
from
you guys.
One of my customers is asking me to give him 30 Mbps via serial and not
via
Ethernet, he says he will get more guaranteed 30 M via serial, because
Ethernet is adding headers and if I shape it on 30 M in reality he will
get
less, is this true ?
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