Re: Repeater? Gateway? Access point?

Mark McIntyre <markmcintyre@xxxxxxxxxxx> hath wroth:

Interesting. Probably figures - I /have/ seen problems running AC
power cables too close to networking, but you have to try really hard
to make a serious issue out of it.

Drivel. The NFPA National Electrical Code requires AC power cables
and signal cables to be in seperate conduits and about 3" (not sure of
exact distance) apart. Same with structured wiring installations but
with different specs (i.e. no conduit required).

Mixing ethernet and AC power will cause problems if the cables run
parallel for any distance. The twisted CAT5 pairs and differential
ethernet transceivers are quite good at avoiding the effects of common
mode DC and garbage on the ethernet pairs. The ethernet xformer also
has quite a bit of loss at 60Hz. What it can't handle is differential
DC and/or garbage. The way to create that problem is to put the
ethernet twisted pair very close to the source of the garbage. One
wire from the pair will be slightly closers to the garbage source than
the other. The difference in garbage pickup is a differential voltage
which the ethernet transceiver has to deal with. Depending on the
amplitude, it usually does quite well, but can saturate the
transformer or overload the ethernet receiver. Either will create
packet corruption or loss. About the only way to create this
situation is to bundle the AC power and ethernet cables together over
some distance. Nobody does that intentionally.


--
Jeff Liebermann jeffl@xxxxxxxxxxxxxxxxxxxxxx
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
.

Relevant Pages

  • Re: AFP protocol
    ... I met, in the 1980s, plenty of workstations hooked up to Ethernet ... AUI socket on the computer. ... reasonable sized black coax cables that use BNC sockets, ... ever used built-in BNC on early third party Mac Ethernet cards, ...
    (uk.comp.sys.mac)
  • Re: Newbie tries and fails
    ... >> main telephone point to an access point elsewhere in the house. ... >> easily run ethernet cables around, I wouldn't need a wireless network? ... It's easy to run an ethernet cable between floors, ... >> extensions elsewhere in the house via the microfilter?". ...
    (alt.internet.wireless)
  • Re: AFP protocol
    ... if you are using an AUI connector. ... I met, in the 1980s, plenty of workstations hooked up to Ethernet ... AUI socket on the computer. ... reasonable sized black coax cables that use BNC sockets, ...
    (uk.comp.sys.mac)
  • Re: AFP protocol
    ... if you are using an AUI connector. ... I met, in the 1980s, plenty of workstations hooked up to Ethernet ... The transceiver is mounted ... reasonable sized black coax cables that use BNC sockets, ...
    (uk.comp.sys.mac)
  • Re: Newbie tries and fails
    ... > main telephone point to an access point elsewhere in the house. ... > easily run ethernet cables around, I wouldn't need a wireless network? ... It's easy to run an ethernet cable between floors, ... > extensions elsewhere in the house via the microfilter?". ...
    (alt.internet.wireless)
Loading