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I'm looking for a specific kind of Ethernet 8-conductor data cable. I am having trouble finding them online (at CDW, Newegg) because I can't always come up with the right search terms.

A search for "Flat Ethernet cable" usually gives me a bunch of nice looking "premium" and expensive cables which are targeted towards the home user/audiophiles, etc.

These cables are typically used with a serial console. In a typical use, one of the RJ-45 jacks will connect to a RJ45-to-DB9 adapter, which then plugs into the serial port on the back of a machine. On older hardware, this may be a RJ45-DB25 adapter, etc.

What are these called? Do these cables have a common name?

Here's a description of the cable:

  • Sysadmins usually assemble these on their own, but I'm looking to save time and buy them.
  • RJ-45 connectors on each end.
  • Color is usually light-grey.
  • Flat (not round). No shielding, no twisted-pair, etc. These are NOT cat5e cables. These are intended for low data rates (9600 bps - 115200 bps ).
  • These are low profile, very flexible and don't take up much room in the cable management system. This is important when dealing with 42 servers and potentially 150+ cables in a rack.
  • Sysadmins often use Ethernet cable instead of this cable, because Ethernet cables are available everywhere.
  • These are similar to Cisco's light-blue rollover cables with a DB9 connector on one end. But I need some without the DB9 adapter.
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Related. –  Dennis Williamson Sep 15 '10 at 2:29
    
I'm pretty sure those aren't cat5e. I've got a site that had those installed instead of Cat5 Ethernet cables. I'm unable to get over 10m half duplex on any of those connections. I highly recommend against them. If you really want them, I'll let you take them out of my site as long as you replace them with real cables :-) –  Jason Berg Sep 15 '10 at 3:38
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4 Answers

up vote 7 down vote accepted

They are commonly known as "console cables" or Rollover cables. They are NOT Ethernet! They are often flat CAT3, or just 8 conductor ribbon cable. All console cables are null modem cables, it is just the pin out that is sometimes different.

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Thanks for the correction. They are not ethernet. –  Stefan Lasiewski Sep 15 '10 at 3:39
    
I like these: thinkgeek.com/gadgets/tools/c890, as they turn any ethernet cable into a rollover, crossover, etc. –  Insyte Sep 20 '10 at 3:49
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You'll sometimes hear the term "silver satin" cable (Crossed / Straight).

crossedstraight

             Crossed                               Straight
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Answered very wrong, editing:

flat conductor cables are not going to be the same as any other standard as far as resistance and general connectivity are concerned. Sure an 8 conductor cable has the same number of wires as a cat5e or cat6, but how the pairs twist is what is important on those cables as far as the signal is concerned. For small cables, it probably doesn't matter much, for long ones it really does. You might need to search at an electronics components store for that type of cable.

If you're really concerned about cable management, there are solutions that are rack add-ons that are decent, but you're better off using waxed string and sticking with cat5e if you're going to be using them for service and not just console management.

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We called them "console cables" in Uni, I'm not sure if that's their official name.

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I call them "Console cables" as well, although there are a number of other cables which fit that description. A DB9-DB9 cable might be called a "Console Cable" as well, right? –  Stefan Lasiewski Sep 15 '10 at 0:44
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