John Combs wrote:
>
> Our testing laboratory has a customer who needs a quick turnaround on a T2
> (DS2) interface test for JATE, and we discovered that our North American T2
> equipment is 110 ohm balanced, using a B6ZS line coding, but Japan uses 75
> ohm unbalanced, B8ZS line coding! Does anyone know of any test equipment
> than can send & measure jitter on a T2 unbalanced interface?
>
> In my quest to find such test equipment, I have run across a disturbing
> fact -- most of the major test equipment manufacturers are abandoning
> production of ANY T1/T2/T3 test equipment, because the market is drying up
> (their words). Apparently, the major purchasers of such equipment have
> been telcos and long distance companies, and nowadays they don't need it
> any more because the test capabilities are built into their switches. HP,
> Siemens & TTC (Fireberd) have discontinued their production of such
> equipment completely. (I'm not sure about W&G at this point.)
>
> This is a problem for a test laboratory, as we _still_ need such equipment,
> at least to replace our aging equipment at some point down the road...
Hold on. Actually, as long as we're talking strictly T-2,
I'm surprised someone is still installing T-2. It is drying
up and in fact at least up here in CT, it has dried up. If
the companies installing the lines even start thinking about
T-2, they opt for T-3.
I will try to get more info for you, but off-hand NEC and
Telco Systems had systems for testing T-2. I think we
have some catalogs somewhere for addresses.
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The comments and opinions stated herein are mine alone,
and do not reflect those of my employer.
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