Tait TB8100 User Manual page 93

When you program a configuration into the base station, the Service Kit checks
whether the network identity of the configuration is the same as the network
identity of the base station. If it is not, you are given the choice of overwriting
the network identity, or of keeping the existing network identity, while
updating the rest of the configuration. A new network identity only takes effect
when the Service Kit session ends.
The network identity consists of the following three items.
IP address specifies the IP address of the base station in dotted quad format.
Entering a proper IP address also enables the Ethernet interface.
Subnet mask. Enter the subnet mask required by the IP addressing plan for
the network. This tells the base station the IP address range of equipment on
the local subnet. If you are connecting the Service Kit directly to the base
station or via a port on a local hub or switch, you can leave this box empty. (An
empty Subnet mask box is equivalent to a mask of 0.0.0.0, which means that
no IP packets will be sent outside the local subnet.)
255.255.255.0 and 255.255.0.0 are common subnet masks. Subnet masks are
entered in dotted quad format but must convert to a 32-bit binary number
consisting of all 1s followed by all 0s. The following are the only legal values in
any of the sections of the subnet mask:
0 = 00000000
128 = 10000000
192 = 11000000
224 = 11100000
240 = 11110000
248 = 11111000
252 = 11111100
254 = 11111110
255 = 11111111
255 (all 1's in binary) is the only value that can be to the left of one the above.
0 is the only value that can be to the right. For instance, the following are legal
subnet masks:
255.255.0.0
255.248.0.0
255.255.192.0
Default gateway can be used to specify the IP address of the first router on
the communication path from the base station to the Service Kit or syslog
collector. The network design may require that you configure the base station
with this information. If you are connecting the Service Kit directly to the base
station or via a port on a local hub or switch, you can leave this box empty. (An
empty Default gateway box is equivalent to a default gateway address of
0.0.0.0.)
TB8100 Service Kit User's Manual
Configuring General Options 83