NTS 01 Rev 1 – User Manual March 2006
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Page 20 of 31
Tekron International Ltd
PO Box 31 285 Lower Hutt 6009 New Zealand
tel:
+64 4 566 7722
fax:
+64 4 569 9272
email:
Gateway IP Address:
If the Time Server is required to operate over more than one Ethernet
sub-net, then a Gateway IP Address must be specified. The Gateway Address is the IP Address
of the network router or bridging device that connects the subnets together. When using DHCP,
the network’s DHCP Server will automatically provide the Gateway Address if required.
Netmask:
The Netmask tells the Time Server the number of bits (counting back from the end
of the IP address) that are allocated for addressing individual host devices on the network. As the
NTS01 is normally used on small closed networks, the default value is 8, meaning that the last
octet of the IP address is used to address individual hosts. When using DHCP, the DHCP Server
automatically provides the correct Netmask.
Telnet Access Password:
A four-character password may be set to hinder unauthorised access
to the Time Server Port’s Setup screen over the network. Default is no password.
The simple password provides only basic security. If absolute security is required, Telnet
Access should be disabled. Access is disabled if the password is set to ****.
Change DHCP Device Name:
This option only appears if DHCP operation has been selected
(by setting the IP address value to all 000). The default DHCP host name for an NTS01 Time
Server Port is Cxxxxxx where xxxxxx denotes the first six digits of the NTS’s MAC address. For
example, a NTS with MAC address:- 00:20:4A:72:DB:2B will appear on DHCP Server lease
listings as host: C72DB2B.
Tekron strongly recommends that, if DHCP addressing is to be used, then the NTS Name
should NOT be changed from the default
.
1 - NTS configuration
Selecting this option brings up prompts to set up the parameters required to operate the Time
Server function. For most applications, the default settings will be appropriate. The parameters
that can be set are as follows:-
Broadcast Mode:
Defaults to “
N
”. If “
Y
” is selected, the unit prompts for a poll interval. The
unit will then broadcast time packets at the interval specified. Note that, while in broadcast
mode, the unit will still respond to NTP/SNTP client requests in the usual manner. In most
applications, Broadcast Mode is not used, so the default is the appropriate setting.
Encryption:
Defaults to “
N
”. Most users will not use encryption. The NTS01 supports fully
encrypted requests from up to 6 clients simultaneously on each Time Server Port. If the answer
“
Y
” is selected here, the unit then prompts for six encryption
MAC
strings. A good rule is – if
you do not already know what MAC data to use – don’t attempt to use encryption at all, and
leave the option at “
N
”.
Visible Satellites:
Defaults to “
1
”. Range 0-8. If there are not this many GPS satellites being
tracked for time, a SNMP message “low satellites” is generated. As the NTS01’s clock accuracy
when tracking just a single satellite is at least two orders of magnitude better than what can be
practically handled on the network, the default value of “1 ” is sufficient for detection of this
condition.
