🚀 go-pugleaf

Check your pc:  many have synchronous chips built in.  Although a UART
is the norm for serial ports, some machines use USART's that can be
programmed for synchronous operation.

If you don't have the USART, call Black Box Company.

medlock@bnr.ca wrote:


: Is there such a device as an ASYNC/SYNC Converter?  For
: example, it would plug into a COM port on a PC, and would
: also plug into a SYNC terminal adaptor: 

:           ASYNC                      SYNC
:            V.24                      V.24
:             |                         |
:             V                         V
:    ------        -------------------     -----------
:    | PC |--------| ASYNC/SYNC CONV |-----| ISDN TA |----
:    ------        -------------------     -----------

: In the above configuration, must there be a data link
: protocol (BI-SYNC, HDLC, etc...) running between the
: converter and TA?  Or, can the timing signal be used
: in order to extract the data?  

: I suppose the other option I have is to purchase a
: SYNC serial port for the PC?   In this case, must a
: data link protocol run between the serial port and TA?
: Any good recommendations?

: Thankyou,

: justin


--

Bill Horne
bhorne@lynx.neu.edu       

Bill Horne (bhorne@lynx.dac.neu.edu) wrote:
> Check your pc:  many have synchronous chips built in.  Although a UART
> is the norm for serial ports, some machines use USART's that can be
> programmed for synchronous operation.

> If you don't have the USART, call Black Box Company.

Thanks -- I had already called Black Box and they do have a Sync/Async
serial port (for $300!!).

Another question -- the DCE is responsible for providing clock
to the DTE, correct?  How does the DTE/DCE delineate the user
data carried over the RS-232 cable (no start/stop bits as in ASYNC)?  
Is a data link layer protocol such as HDLC/SDLC required for this
purpose?

     -------          -----------
     |     |  RS-232  |         |       
     | DTE |----------|   DCE   |----->
     |     |          | ISDN TA |
     -------          -----------

    NOTE:  The ISDN TA is performing sync V.110 rate adaption.

Thanks,

justin

bhorne@lynx.dac.neu.edu (Bill Horne) wrote:

>
>If you don't have the USART, call Black Box Company.
>
>
>Bill Horne
>bhorne@lynx.neu.edu       
>
>
Hi
Black box are very good at this sort of stuff.  Have a look at
http://www.blackbox.com/.  This gives a subset of thier product range
& lets you order a catalogue online.

Pete Jones
Bramble Software

Any body had any dealings with these guys-good or bad? E-mail please.

Hmm. Are you sure your TA requires a synchronous stream?  While V.110 is a
rate adaption protocol, it is typically used to convert an asynchronous
stream to a synchronous 64K stream (for transport over a B channel). 

Example, the TA would take in an async stream from your DTE at 19.2 Kbps,
use V.110 to turn the data into a 64 Kbps stream, and place it on the B
channel. It seems that your TA should probably do this.

In article <4h02v7$8ct@crchh327.rich.bnr.ca>, medlock@bnr.ca wrote:

> Bill Horne (bhorne@lynx.dac.neu.edu) wrote:
> > Check your pc:  many have synchronous chips built in.  Although a UART
> > is the norm for serial ports, some machines use USART's that can be
> > programmed for synchronous operation.
> 
> > If you don't have the USART, call Black Box Company.
> 
> Thanks -- I had already called Black Box and they do have a Sync/Async
> serial port (for $300!!).
> 
> 
>     NOTE:  The ISDN TA is performing sync V.110 rate adaption.
-- 
Joel Sumner                      Motorola Semiconductor Products
joels@oakhill.sps.mot.com        Data Communications
For some reason, lawyers seem to think that I speak for Motorola....

Joel Sumner (joels@oakhill.sps.mot.com) wrote:
> Hmm. Are you sure your TA requires a synchronous stream?  While V.110 is a
> rate adaption protocol, it is typically used to convert an asynchronous
> stream to a synchronous 64K stream (for transport over a B channel). 

If I understand the history of V.110 correctly, it was initially
only for SYNC devices, and the ASYNC (RA0 function) was added at
a later date.

> Example, the TA would take in an async stream from your DTE at 19.2 Kbps,
> use V.110 to turn the data into a 64 Kbps stream, and place it on the B
> channel. It seems that your TA should probably do this.

This is the current setup that I have,  but was wondering what would
be required to change out the I/F between the DTE and PC to SYNC.
Apparently, all I would need is a SYNC serial port -- the TA provides
clock and life is wonderful (no data link protocol required).

justin