Software Vault: The Diamond Collection/The Diamond Collection (Software Vault)(Digital Impact).ISO/cdr16/tc14_478.zip/TC14-478.TXT

Text File | 1995-01-22 | 8KB | 222 lines

In article <[e-mail]>, [e-mail] (Matthew P.
Downs)
writes:

> These filters are not to limit your modem
> speeds, but to protect you 64 kbps channel from others.  So you
don't
> hear the cross talk on your line!  This was done a long time before
> modems were ever thought of ...

Not quite; there's no way one DS0 can interfere with another, and
there's no such thing as cross-talk at the digital level.  The analog
filters are there to prevent aliasing, which is an objectionable beat
frequency which appears in the spectrum when the Nyquist limit is
exceeded by any component of the signal.


James Carlson <[e-mail]>            Tel:  [phone]
Annex Software Support / Xylogics, Inc.               [phone]
53 Third Avenue / Burlington MA  01803-4491     Fax:  [phone]

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From: [e-mail] (John Lundgren)
Subject: Re: Questions About Fax/Voice Modems and Dual-Mode Modems
Date: 30 Dec 1994 15:47:37 GMT
Organization: Pacific Bell Knowledge Network


> Could anyone reccommend/ clarify products for any of the following:

> 1. A fax / voice / data modem with software which handles voicemail,
> faxes and faxbacks. (External preferably.)
>  a. 14.4k one
>  b. 28.8 VFC
>  c. V.34
> Hardware and software (windows based) can be from different vendors,
> but a bundled package is preferred.

> 2. Any of the above modems, with Caller-ID information capability
included.

> (Would this capability be the same for ANI pickup, in case number
being
> rung is an 800 number?? If not which product for this??)

I'm in California, so no Caller ID, but the following modem has it,
along with FAX and voice.  I own two of their U-1496e external modems.

ZyXEL modems and VoiceFax software from (for DOS, Windows and Mac,
info from their flyer):

ZyXEL Communications Corp.
4920 E. LaPalma Ave.
Anaheim, CA 92807
[phone]
FAX: [phone]

For more info on the new ZyXEL ZyCellular protocol and VoiceFax
software,
call [phone].  email: [e-mail] or Compuserve 71333,2734


John Lundgren - Elec Tech - Info Tech Svcs
Rancho Santiago Community College District
17th St. at Bristol \ Santa Ana, CA 92706
[e-mail]\[e-mail]

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From: [e-mail]
Subject: Re: Long Dial Tone Holds [Was DMS-100 vs 5ESS]
Date: 30 Dec 1994 16:38:43 GMT
Organization: DCLU - City of Seattle


>  At my 5ESS switch in Pennsylvania 610-525 (served by Bell
Atlantic),
>  if you try to dial 1 301 *67, the second you hit the *, you get a
fast
>  busy.

For better results try dialing *67-1-301-XXX-XXX


Mitch Greer   Seattle, WA

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Date: Fri, 30 Dec 1994 08:26:02 -0800
From: RICHARD M KENSHALO <[e-mail]>
Subject: HDSL/ISDN


Both ISDN and HDSL use similar line coding - called 2B1Q, or 2
Binary/1 Quaternary.  This means that digital data is grouped in bit
pairs, and each bit pair is coded into a 4-level symbol called a QUAT.
This allows 2B1Q to cut the overall bit stream line rate in half,
since 2 bits is equal to one symbol.  This has advantages when
bundling HDSL pairs and other (T-1) pairs in that the power spectrum
is centered much lower than the T-1, minimizing crosstalk.

ISDN (BRI) uses 2B1Q at 160 Kb/s over a single pair.  In this case,
TCM (Time Compression Multiplexing) is used in alternating data
bursts, followed by guard times to allow the line to settle, to
provide duplex transmission over a single pair of wires.  Again, 2B1Q
technology is used to minimized the power spectrum on the voice grade
loop.  HDSL uses two pairs for full duplex, and higher line rates.


Richard Kenshalo
Matanuska Telephone Association
[e-mail]

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From: [e-mail] (Oliver Mauss)
Subject: Paknet/Cognito
Date: 30 Dec 1994 17:36:27 GMT
Organization: Rechnerbetrieb Informatik - RWTH Aachen


I am searching for information about two wireless data services in the
UK: Paknet and Cognito. Can anyone give me a pointer to sources of
information for these two systems?


Thanks,

Oliver C. Mauss             | Aachen University of Technology - RWTH
                            | Integrated Systems for Signal Processing
 phone: [phone]  | ISS - 611810
 fax:   [phone] | Templergraben 55
 [e-mail]   | 52056 Aachen, Germany

------------------------------

From: [e-mail] (Robert De Vries)
Subject: Portability of 800 Number When Bill Not Paid
Organization: NETCOM On-line Communication Services (408 261-4700
guest)
Date: Thu, 29 Dec 1994 18:31:12 GMT


I want to switch 800 carriers, away from a carrier with whom I have a
billing dispute.

Is there any provision in FCC regs that allows the old carrier to
refuse to release the number to teh new carrier, i.e., to deny
portability to a new carrier in the case of an unpaid bill?



[e-mail]


[TELECOM Digest Editor's Note: I am not aware of any such restrictions
and the carrier you are dropping is probably going to play games and
sit on the transfer request as long as possible just to extract a bit
more anxiety from you. I do not know the amount of money in question
or the nature of the dispute, but if the money is substantial and they
feel they are correct in their billing then your yanking of the
account
away from them will probably be their green light to sue you for the
amount due. At least when the account is still active with the number
turned on and running in their office, there is some incentive on your
part to continue the process of resolving the dispute. If they cut
your service, or you move the service to another carrier -- whichever
happens first -- then there is no longer any incentive on *your part*
to settle with them, and they know that. So depending on the amount of
money involved and the nature of the dispute, you may be opening a can
of worms for yourself. Care to tell us more about what's going on?
PAT]

------------------------------

From: [e-mail] (Ry Jones)
Subject: 360 Prefix List
Date: 29 Dec 1994 23:03:17 GMT
Organization: The SenseMedia Network


Folks,

This is from a US WEST circular from the "large business group". It's
a list of the prefixes in 360. For better or worse, here it is. All
typos are of course my fault.

360 Prefix List

201 202 212 221 225 231 238 240 245 247 249 253 254 256 257 206 262
263 264 267 268 269 273 274 275 276 278 288 289 291 293 295 297 299
301 315 317 319 321 327 330 331 332 336 341 352 354 357 366 371 372
373 374 375 376 377 378 379 380 384 385 387 396 398 401 404 405 407
408 412 414 416 417 418 422 423 424 425 426 427 428 429 430 435 436
437 438 444 445 446 452 456 457 458 459 460 465 466 468 470 476 478
479 482 484 490 491 492 493 494 495 496 497 498 501 518 520 532 533
534 538 561 563 568 569 573 574 576 577 578 579 580 586 590 592 595
598 599 613 629 636 638 642 645 647 648 650 651 652 653 658 659 663
664 665 668 671 673 674 675 676 677 678 679 681 683 686 687 690 691
692 693 694 695 696 697 698 699 701 705 707 708 710 713 714 715 724
729 730 731 732 733 734 736 737 738 739 740 741 748 749 750 753 754
755 757 758 765 766 769 777 779 785 786 791 792 793 794 795 796 797
798 801 802 808 817 825 826 829 830 832 834 835 837 849 853 855 856
864 866 871 873 875 876 877 879 886 887 892 893 894 895 896 897 898
901 902 903 904 905 908 921 923 928 934 942 943 944 945 951 956 961
962 963 966 973 978 981 983 985 987 988

Don't reprogram your PBX by this list. :)


Please reply to [e-mail] or directly to [e-mail].
Other mutations may bounce, such as [e-mail].

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End of TELECOM Digest V14 #478
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