[time-nuts] Z3805 utility, Was: AW: (no subject)

Robert Benward rbenward at verizon.net
Mon May 24 03:30:44 UTC 2010

It's no mystery if you know the naming convention.  As you said, if you look at the modem as "line driver" of sorts, 
then yes, the line marked TX would an input to the driver...I think the problem is there are so many sources for the 
info, and each presents it a little differently, adding to the confusion.


----- Original Message ----- 
From: "Mike S" <mikes at flatsurface.com>
To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
Sent: Sunday, May 23, 2010 10:29 PM
Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject)

> At 09:27 PM 5/23/2010, Robert Benward wrote...
>>If your device is a DCE, then pin 2 is really a RX input, not a TX output.
> You're looking at it wrong - a modem is a DCE, and pin 2 is Transmitted Data (TX) input. That is, data input to the 
> modem for transmission to the remote. TX is an output on a DTE, and an input on a DCE. The signal name doesn't change 
> between DTE and DCE.
> Per the spec: "Signals on this circuit are generated by the DTE and are transferred to the local DCE for transmission 
> of data to remote DCE(s) or for maintenance or control of the local DCE."
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