sundance-communications.com/forum Forums Wiring - Telecom Carriers - Trunks & Services Cabling Telephones Systems Wiring Punching split-jacket DSX-1 on a 568B patch panel

We're finishing up a new install of a 181 seat callcenter (it's gonna be pretty; I'll post pictures later :-), but I have one outstanding issue I could use some help with.

I'm hauling my DSX-1s from the smartjacks to the rack in a pair of 25-pair Cat3, RX in one jacket, TX in the other jacket, in precisely the fashion approved by the manual.

The patch panels, however, are the standard 8p8c with 568b color coding on them.

Does anyone know off hand which colors I should have my guy punching the matched pairs onto on the back of the panel? I ought to be able to figure that out on my own, but for some reason, it just eludes me.

I'll be using standard Ethernet patch cables at both ends, so these are the only punch-downs that need to be 'magical'...

You'll use pins 1&2 and 4&5, so on a 568-B patchpanel, that's the White/Orange pair (1&2) and the White/Blue pair (4&5)

Receive from the network on 1 & 2. Transmit to the network on 4 & 5.

Sam

Are RX and TX always named from the POV of the CPE, then? That was one of the things I wasn't clear on.

You transmit to the network and receive from them. If it doesn't work, reverse your cables. But your transmit goes to their receive and vice versa. They should have their equipment identified.

Sam

IOW: "No, TX and RX are from the point of view of each labeled equipment, and you can't *label* the cables."

That is, my patch-bay to patch-bay cabling has to go from the TX at one end to the RX at the other, so I can't actually *label* it as either?

Or do I still have it wrong?

In short: do I wire it

1-1
2-2

or

1-2
2-1

or

1-4
2-5

or

1-5
2-4

?

(And again, remember: I am working *behind patch panels at both ends*)

Are you going to use the rest of the pairs on 25 pair for something else?

I'm running 24 T-1 circuits from a 24-port patch panel (with silver satins plugged into it from the smartjack) to another 24-port patch panel in a rack...

where standard ethernet patches will cross the circuits to yet another 24-port patch panel which is wired 568B at both ends to the Sangoma a104 cards in my PCs.

And I'm trying to put -- as I understand is recommended practice -- all the TX pairs in one cable, and all the RX pairs in the other.

Baylink, In the old days (Yeah, I know) OSP cable for this use was called "D" screen as it had a shield around half of the cable count to isolate it from cross feeding the TX-RX.

ISP cable can be special ordered with a similar cable (CO DSX apps) but it is not common anymore.
Yes, two cables and separate paths so they can't cross feed due to bleed.

Keep good cable records.....Have fun!

The 2 24-ports are numbered, and you can stand in one spot and touch both of them; they're just on adjacent walls, and it takes about 30 feet of cable to get from one to the other... and I didn't want to bundle 24 30-foot runs of cat 3/5 up the wall, and over the ladder rack. :-)