DXLINK problems

Danny Campbell

I am working on an install with a DGX16 and a DVX2155. The installer has used shielded CAT-6 for the DXLINK runs that are all less than 100m.

If I configure a particular TX/RX device using ethernet, I can then connect it to the DGX using a short CAT-5 Patch cable and everything shows up properly in the online tree.

When connecting the DXLINK cables to the transmitters/receivers in the intended location using the installers cable, I get power. I can also see some of them passing video. What doesn't happen is the device showing up in the online tree either as a bound or non-bound device.

I've been told that the cables "tested good", but I have no idea how they tested them.

I'm convinced based on my troubleshooting that it is a cable issue, but I'm not sure how to explain it to the installers what they need to look for.

kennethk

Couple of days ago, i had a TP powering on POE, but not going online.
I had to "prove" to the installer with a "good" cable, before i got "my wish" -That the installer re-terminated the cable.

After that, all was good. They to, had "tested" the cable.

Alot of different test equipment, and alot of different faults with cables.
I guess they dont buy the most expensive ones...

We do bring our own tester, a semi-cheap, who shows wiring and feet/mtr for each pair.
When a damaged cable is tested, we can often see it at the length (different pairs have mtrs. different lenghts).

champ

It'll be cables or terminations.
You can get stats on a cable by connecting to the DGX serial or ENC port with a terminal, hitting ctrt+c to get to the shell then type SHOW STATS.
You will see a list of signal strength values, if any are under 19dB there may be problems.
For more information it's at the end of the DGX manual.

Danny Campbell

Thanks for the info guys. I'll give the stats thing a test tomorrow.

Danny

Auser

We've also seen I/O cards for Enova frames which pass power/video but on which the Ethernet is defective.

They have had to go back for replacement. The issue seems to occur on an individual port basis (not all ports on a card are necessarily affected).

Danny Campbell

As expected, the problem was with bad terminations.

logicpro

Tester

In my opinion, any installer who doesn't certify or verify all LAN terminations is making a serious rookie mistake. In the last 25 years I have only seen the newbie's fight the tester!!!!!!!!!!!!!!!!!!!!!!!