help wrt UUCP between 3B1 OBM and TB
Greg Andrews
gandrews at netcom.COM
Wed May 8 15:08:34 AEST 1991
In article <1991May5.121256.4453 at blilly.UUCP> bruce at balilly (Bruce Lilly) writes:
>
>This is a well-known problem with Telebit modems (at least the TB+) when
>operated with the interface speed locked. The Telebit puts out a
>non-standard signal, which causes the 3B1's built-in modem to receive
>garbage (the 3B1's OBM is rather intolerant of non-standard signals).
>Telebit refers to this bug as "bit-shaving".
>
>Your options are:
>1) don't operate the Telebit's with interface speed locked
>2) try to get Telebit to fix the problem (1-800-TEL-EBIT) (good luck)
>3) trade in the Telebits for another brand of modem
>4) use an external modem on the 3B1 which will accept the Telebit's
> non-standard timing
>
"Good Luck" is a pretty good sentiment. Why? Because it's NOT a Telebit
bug. Bruce, you can call it Telebit's "problem" and "non-standard timing"
all day long, but that's simply not the case.
As I mentioned in my other article, Stop Bit Deletion (and the corresponding
Stop Bit Insertion) are a part of the modulation spec. The modem that can't
handle re-inserting the stop bit is the one with the problem. Telebit modems
can handle Stop Bit Insertion - guess which modem has the problem?
As I'm at home tonight, I can't quote chapter and verse from the specs on
this, but you can be certain that I will find it and quote it for you. If
it turns out I'm wrong, I'll eat my words on it.
My last posting was wrong on one point: Telebit modems perform Stop Bit
Deletion in the Bell 212 and V.22 (1200 bps) modulations also - not just
V.22bis (2400 bps).
>
> Bruce Lilly blilly!balilly!bruce at sonyd1.Broadcast.Sony.COM
>
--
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| Greg Andrews | UUCP: {apple,amdahl,claris}!netcom!gandrews |
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