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S100 User Guide – Rev. D – June 2005 v
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How many satellites are necessary for me to operate the S100? 111
How do I know if the satellite signal strength is good? 111
What is the maximum antenna cable length for use with the S100? 111
What are the available antenna cable lengths and antenna requirements? 111
What are some guidelines for correctly cutting the cable, using splitters, and
using cable connectors? 111
How many NTP requests can be processed by the S100 each second? 112
Does the S100 support NTP v4? 112
Can the S100 utilize a certificate from an external CA? 112
How is the interface to the S100 secured? 112
What security functions are provided with the S100? 112
Does the S100 support any functions to restrict user access to NTP service? Can
the S100 set up clients' IP address to be connected? 112
What is the bandwidth utilization (TCP/IP) each time an NTP client gets a time
update from the NTP server? 112
Is NTP v4 compatible with Network Address Translation (NAT) gateways? 113
How does the S100 clock behave when a leap second is introduced? 113
How-to’s and Tips 113
How to install NTP v4 on a UNIX system 114
How to configure an NTP v4 client to connect to an NTP v4 server with the
autokey scheme 114
How to verify NTP v4 autokey client connectivity with an NTP v4 server 114
How to install your S100 114
How to get time using dial-up 114
How to get time using GPS 114
How to install your GPS antenna 115
How to acquire and install SymmTime™ 115
Use the quick “How to” guide 115
How to change the root password 115
How to get information about NTP 116
Solutions 116
The S100 does not respond to ping command 116
The S100 does not respond to NTP queries 116
I cannot establish a serial connection with the S100 116
My S100 won’t track satellites 117
Appendix A
S100 Specifications 119
S100 Data Sheet Specifications 119
Pin Descriptions 120