Black Box Advanced Console Server User Manual page 371

NEBS
Network Mask
BLACK BOX® CS Installation, Administration, and User's Guide
Trial and error is the only sure way of finding the optimal
MTU, but there are some guidelines that can help. For
example, the MTU of many PPP connections is 576, so if you
connect to the Internet via PPP, you might want to set your
machine's MTU to 576 too. Most Ethernet networks, on the
other hand, have an MTU of 1500.
NEBS (Network Equipment Building Systems) Compliance
means that equipment has been tested and proven to
meet the NEBS requirements commonly adhered to by
several telecommunications carriers. The requirements
are in place to ensure that telecommunications
equipment poses no risk or safety hazard to people,
nearby equipment, or to the physical location where the
equipment operates, and that equipment is reliable and
dependable during both normal and abnormal
conditions. Tests address heat release, surface
temperature, fire resistance, electomagnetic
compatibility, electrical safety, and manufacturing
component characteristics, among other attributes.
A 32-bit number used to group IP addresses together or to
indicate the range of IP addresses on a single IP network/
subnet/supernet. There is a group of addresses assigned to
each network segment. For example, the mask 255.255.255.0
groups together 254 IP addresses. If we have, as another
example, a sub-network 192.168.16.64 with mask
255.255.255.224, the addresses we may assign to computers
on the sub-network are 192.168.16.65 to 192.168.16.94, with
a broadcast address of 192.168.16.95.
A number used by software to separate the local subnet
address from the rest of a given Internet protocol address
Network masks divide IP addresses into two parts (network
address and address of a particular host within the network).
Mask have the same form as IP addresses (i.e.
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