Modem speed through digital pbx ?

Edwards Finance > Phones

Q. I have several hotel customers who have guests trying to use their modems through the room analog jacks. First they forget to dial 9 and next they complain about poor connection speeeds. We have a one Nitsuko 384 and an Onyx being heavily used for modem traffic. The Onyx user is a software company and they use 8 ports to access outside lines. They are happy with the speed they get which seems to be around 28.8k. I suggested an older switch that doesn't do any data conversion to fix this problem. I don't think the manufacturers expected the data rates that are available and as a result the pbx's clock way too slow. Its hard to expain that you cant shove 56k through a system clocking below that.

A. Nothing to do with the "pbx clock". It's an issue of where and how many analog to digital conversions there are. For any of the 56k variants, you are only allowed one digital to analog step. This is integral to the signaling. Any more will kill 56k (be it v.90, x2, or k56flex). If you have a completely analog pbx that doesn't do any time-slicing (possibly a SX200) you might be able to squeeze a v.90 signal through it. If you have a digital pbx with analog trunks (NT Meridian or Mitel SX2000 w/o digital trunks), or a time-sliced analog switch (such as an Oki Discovery), you won't. Even on the analog SX200 you may not get a full v.90 due to losses between the trunk and ons cards internal to the PBX. IIRC, when I was working at Mitel in the early 80's, I was told that the solid-state switching matrix used on the SX-200 was bandlimited to about 4800 bps, and that faster modems would not work with them. Don't know if this is true today (or even if it was true then!), but I do recall that the engineers recommended against it as a data switch for anything other than low speed (2400 or less) data. We have not seen serious throughput problems on the 200A (or 200D/480) and have even put some in along side other PBX's for the sole purpose of dial-up data connections. Routing 28.8/33.6 has not been a problem.

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