On 15 Oct 2000 22:51:22 -0400, Lists Wizard <[EMAIL PROTECTED]> wrote:
:What is general rule of thumb for cabling tow networking devices? In other
:words: when should I use cross-over, roll-over or straight-through cables to
:connect tow networking devices
Ethernet: Cross = 1,2 <-> 3,6
If exactly one end of the cable connects to a switch or hub, it's
straight-through. Otherwise cross-over. Note: Some hubs have a
reversed port for "uplink" or a switch to cross over one port so
a straight-through can be used to daisy-chain hubs.
Console/AUX: Roll = 12345678 <-> 87654321
Rollover = normal DCE-to-DTE.
Straight-thru = Null-modem.
T-1: Cross = 1,2 <-> 4,5
Straight = CSU/DSU to smartjack
Crossover = CSU/DSU to CSU/DSU
56K DDS: Cross = 1,2 <-> 7,8 (A rollover cable will work as a cross here)
Straight = CSU/DSU to line
Crossover = CSU/DSU to CSU/DSU
Fiber 100-base-FL and Gig-E: Tx on one device to Rx on the other. Duplex
fiber normally has printing on one strand for easy identification. If it
doesn't work, swap them. Do not stare into laser with remaining eye.
Note: It is not uncommon for telephone installers to accidentally cross
T-1 and 56K DDS when extending the jack.
--
Jay Hennigan - Network Administration - [EMAIL PROTECTED]
NetLojix Communications, Inc. NASDAQ: NETX - http://www.netlojix.com/
WestNet: Connecting you to the planet. 805 884-6323
--
Jay Hennigan - Network Administration - [EMAIL PROTECTED]
NetLojix Communications, Inc. NASDAQ: NETX - http://www.netlojix.com/
WestNet: Connecting you to the planet. 805 884-6323
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