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
31 Mar
31 Mar
4:30 p.m.
This is classic frozen yellow garden hose- typical yellow jacket. So not
teflon, probably. I suppose if I inspect it closely I might find the old
classifications: CMP for plenum, CMR for riser, CM for neither, right?
At 11:41 PM 3/31/2005 +0100, you wrote:
On Apr 1 2005, 0:11, Jochen Kunz wrote:
[Humor] I like this new idea of voodoo acupuncture. You don't have to
go anywhere, you just walk down the street, and all of a sudden,
"Ah!" --Steven Wright
--... ...-- -.. . -. ----. --.- --.- -...
tpeters at nospam.mixcom.com (remove "nospam") N9QQB (amateur radio)
"HEY YOU" (loud shouting) WEB ADDRESS http//www.mixweb.com/tpeters
43? 7' 17.2" N by 88? 6' 28.9" W, Elevation 815', Grid Square
EN53wc
WAN/LAN/Telcom Analyst, Tech Writer, MCP, CCNA, Registered Linux User 385531
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
7204
days inactive
7205
days old
1 comments
2 participants
participants (2)
-
pete＠dunnington.u-net.com -
tpeters＠mixcom.com