[ntp:questions] GPS clock for Linux

Richard B. Gilbert rgilbert88 at comcast.net
Fri Sep 12 11:45:51 UTC 2008

Terje Mathisen wrote:
> Richard B. Gilbert wrote:
>> Hal Murray wrote:
>>> The Garmin GPS 18 LVC is popular.  "Some assembly required."
>>> (aka soldering)  No big deal if somebody has a soldering iron
>>> handy.  There are a couple of links from here:
>>>   http://support.ntp.org/bin/view/Support/InexpensiveOemGps
>> You will need a 5VDC power supply and a DB-9 or DB-25 connector that 
>> will connect to a serial or parallel port.  The serial port DCD line 
>> is frequently used.  Also some hookup wire, solder, and perhaps other 
>> goodies.
> Using a USB port for the +5V line is the canonical solution: Very cheap, 
> dependable, and no extra wall warts.
> Terje

I have read claims here that the high and unpredictable latencies in USB 
render it useless for time keeping!

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