for the correction algorithm to begin on power up. If for some reason the value seems wrong or not
working, a Reset is allowed that will, after a reboot, start the algorithm from default and restart the
correction process.
If using the TM2X00B for manual NTP time generation, having the device on the GPS for a period of
time to determine the correction, then saving it, will dramatically improve drift of the TM2X00B when
operated without GPS reception.
3.4.11 DPLL Status (TM2500C Only)
This line on the Status web page give a quick view of the Inputs, Outputs, and Clock quality of the
Digital PLL (DPLL) in the TM2500C. The items will be colored either Red or Green. Red meaning
the input or output is not locked and stable, Green meaning the input or output is locked to the clock.
• Sysclk status information is information about the internal operation of the DPLL. These
typically go green almost immediately upon startup of the device and short of some hardware
failure, will be green any time they are checked by the Status page reload.
• Inputs to the chip are the OCXO, which will be stable to the DPLL essentially from the startup
of the device. The 1PPS however, will stay Red until some time after the GPS locks to the
satellites in view. At least a 2D lock is required before the 1PPS input will go to Green.
• Outputs, which are dependent on both the OCXO and 1PPS inputs will stay red until both
inputs are stable. Once these outputs turn green on the Status page, their respective output
signals will be present on the SMB connectors. The DPLL does require a little bit of time after
2D lock to converge and start outputting signals.
3.4.12 DPLL Temp (TM2500C Only)
This is the temperature of the Digital PLL chip on the TM2500C circuit board. It has an operation
range of -40C to +85C.
3.4.13 Version
Displays current software version running on device.
3.4.14 Satellites
This table shows the current list of locked satellites, their signal strengths (SNR), as well as their
current location over the planet. Refreshing the web page updates the table to their current values.
3.4.15 NTP Peers
If time is being updated from a Peer time server, then this table shows the current list of Peer servers
that are being checked to maintain the time in the TM2X00. Several Fields are displayed for each time
server.
• Peer IP – The Peer IP address is the first field displayed.
• Offset – This is the offset of the peer time servers' time when compared to the internal clock of
the TM2X00.
• Delay – The round trip delay to the peer time server
Installation and Operations Manual | Page 8
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