31 Mar
2005
31 Mar
'05
2:41 p.m.
On Apr 1 2005, 0:11, Jochen Kunz wrote:
On Thu, 31 Mar 2005 14:38:07 -0600
AFAIK thick Ethernet cable is more or less RG213.
Typical values are
8
dB / 100 m attenuation at 150 MHz and 15 dB / 100 m at
450 MHz and a
velocity factor of 0.66.
Too slow. The velocity factor for thick Ethernet is supposed to be
around 0.78. You can use RG213 or even RG8 but the maximum size of
your network would be slightly shorter, to allow for slightly longer
round-trip delays.
Ahh, and keep in mind that these cables usually are
not UV resistent,
so
sun light will destroy the outer jacket! Cover the
cable if used
outside to avoid direct sun light.
I believe you can (could) get plenum-rated cable that has a Teflon
outer instead of PVC. Teflon is resistant to UV.
--
Pete Peter Turnbull
Network Manager
University of York