<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: arial,helvetica,sans-serif; font-size: 10pt; color: #000000'>I'll look into Meinberg.<div><br></div><div>I recent thread mentioned high-sensitivity receivers often allow GPS to work inside. Obviously "inside" has a lot of definitions.</div><div><br></div><div>I will need this facility for the TDM timing signals. It's a central office, not a datacenter.</div><div><br></div><div>I don't know that Internet-based NTP would be accurate enough for the timing signals that I need. Maybe, maybe not.</div><div><br></div><div><br><br><div><span name="x"></span><br style="color:rgb( 0 , 0 , 0 );font-family:'times new roman';font-size:medium;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><br style="color:rgb( 0 , 0 , 0 );font-family:'times new roman';font-size:medium;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><span style="color:rgb( 0 , 0 , 0 );font-family:'times new roman';font-size:medium;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;display:!important;float:none">-----</span><br style="color:rgb( 0 , 0 , 0 );font-family:'times new 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src="http://www.ics-il.com/images/youtubeicon.png"></a><span name="x"></span><br></div><hr id="zwchr"><div style="color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;"><b>From: </b>"Majdi S. Abbas" <msa@latt.net><br><b>To: </b>"Mike Hammett" <nanog@ics-il.net><br><b>Cc: </b>nanog@nanog.org<br><b>Sent: </b>Thursday, July 11, 2019 9:54:26 AM<br><b>Subject: </b>Re: Time and Timing Servers<br><br>On Thu, Jul 11, 2019 at 09:29:46AM -0500, Mike Hammett wrote:<br>> There were a lot of NTP threads several weeks ago, but I didn't get an answer to my question amongst all of the other chatter. <br>> <br>> I'm looking for a device that can receive GPS inside a building without the <br>> assistance of an external antenna (Frontier says they no longer allow <br>> external antenna), will provide traditional NTP services, and will provide <br>> a timing signal that my Metaswitch can work with. <br><br> Unfortunately, L band satellite signals are incredibly weak by<br>the time they reach the surface. It's very unlikely this is going to<br>work for you (unless it's a wood framed single story building.)<br><br> Generally, I try to ensure that a GNSS antenna is built into the<br>contract, to avoid games like this.<br><br> You have two options:<br><br> A) Find a new colocation provider. This may already be on your<br>to-do list for other reasons.<br><br> B) Rely on the Internet for timing, using NTP or PTP from <br>another location to backfeed the site, and use a box with a good<br>stable oscillator to keep time (this can actually be a commercial<br>time server with decent holdover characteristics.<br><br> If you're just looking for alternatives to Microsemi, I highly<br>recommend talking to the fine folks at Meinberg.<br><br> --msa<br></div><br></div></div></body></html>