brinich@keinstr.UUCP (Mark Brinich) (03/19/91)
Ever since we switched over to a Meridian PBX(which is connected to our local switching office via T1 lines) we've seen a considerable degredation of throughput on our modems. For example, when we connect to uunet via our T2500 we're seeing 600-800 char/sec throughput. That's not too surprising with uunet, but I also see it with a local feed. I'm including my T2500 register settings here, if that's of any help: E0 F1 M3 Q4 P V1 W0 X0 Y0 &P0 &T4 Version GF7.00-T2500SA S00=001 S01:001 S02=043 S03=013 S04=010 S05=008 S06=002 S07=040 S08=002 S09=006 S10=007 S11=070 S12=050 S18=000 S25=005 S26=000 S38=000 S41=000 S45:255 S47=004 S48=000 S49=000 S50=000 S51:254 S52:002 S54:003 S55=000 S56=017 S57=019 S58:002 S59=000 S61:050 S62=003 S63=001 S64=000 S65=000 S66:001 S67=000 S68:003 S69=000 S90=000 S91=000 S92=000 S93=008 S94=001 S95=000 S96=001 S97=000 S98=003 S100=000 S101=000 S102=000 S104=000 S105=001 S106=000 S107=020 S110=255 S111:030 S112=001 S121=000 S130:004 S131=002 S150=000 S151=004 S152=001 S153=001 S154=000 S155=000 S157=000 S158=000 S160=010 S161=020 S162=002 S163=003 S164=007 S169=000 S255=000 OK But we're seeing lousy throughput with all our modems(some can't even send reliably at 2400 baud). If there are people out there with similar experiences with I'd be interested in hearing...........thanks........mcb -- Mark Brinich voice mail(or maybe the real live thing)216 498-2821 e-mail uunet!keinstr!brinich Keithley Instruments 28775 Aurora Rd. Cleveland, Ohio 44139-1891
gandrews@netcom.COM (Greg Andrews) (03/20/91)
In article <1991Mar19.145538.1002@keinstr.uucp> brinich@keinstr.UUCP (Mark Brinich) writes: > >Ever since we switched over to a Meridian PBX (which is connected to >our local switching office via T1 lines) we've seen a considerable >degredation of throughput on our modems. For example, when we connect >to uunet via our T2500 we're seeing 600-800 char/sec throughput. That's >not too surprising with uunet, but I also see it with a local feed. I'm >including my T2500 register settings here, if that's of any help: > > [register dump deleted] > The modem's configuration isn't real useful, especially if they worked well before you got the new PBX. What you really want to do is examine the S71 and S73 displays while the modem is connected in PEP mode. Connect to another PEP modem in PEP mode and after you've logged into the system to the point where it won't disconnect on you, use +++ to get your modem's attention and look at the modem's carrier allocations with ATS71? and ATS73?. Compare that with the same displays when two PEP modems are connected back-to-back with a phone cable, and you'll have an idea of how your modems are doing with the new PBX and how they would do over an 'ideal' connection. > >But we're seeing lousy throughput with all our modems (some can't even >send reliably at 2400 baud). > I noticed that no error correction was enabled in your settings. Do you turn error correction on when you dial out? -- .------------------------------------------------------------------------. | Greg Andrews | UUCP: {apple,amdahl,claris}!netcom!gandrews | | | Internet: gandrews@netcom.COM | `------------------------------------------------------------------------'
jah@mojo.ots.utexas.edu (Jeff Hayward) (03/21/91)
In article <1991Mar19.145538.1002@keinstr.uucp> brinich@keinstr.UUCP (Mark Brinich) writes: >Ever since we switched over to a Meridian PBX (which is connected to >our local switching office via T1 lines) we've seen a considerable >degredation of throughput on our modems. For example, when we connect >to uunet via our T2500 we're seeing 600-800 char/sec throughput. That's >not too surprising with uunet, but I also see it with a local feed. I'm >including my T2500 register settings here, if that's of any help: > [...] Check with your PBX installer to find out wether your calls are going over lines that do ADPCM or some other voice compression. We had some trouble with V.32 modems behind PBXs that do compression. I would think that PEP would hold the connection and simply run a bit slower. -- Jeff Hayward The University of Texas System +1 512 471 2444 Office of Telecommunication Services jeff@nic.the.net