ADTRAN Express L128T S User Manual page 183

Media Access Control (MAC)
As defined by the IEEE, the lower of the two sublayers of the
OSI reference model data link layer. The MAC sublayer is
concerned with media access issues, such as whether token
passing or contention is used.
message
The Layer 3 information that is passed between the CPE and
SPCS for signalling.
multipoint line
A communications line having multiple cable access points.
Name Binding Protocol (NBP)
The AppleTalk transport-level protocol that translates a char-
acter string name into the internet address of the correspond-
ing socket client; NBP enables AppleTalk protocols to
understand user-defined zones and device names by provid-
ing and maintaining translation tables that map these names
to corresponding socket addresses.
NAT
Network Address Translation occurs at the borders of stub
domains. Its purpose is to translate the IP address of passing
packets by changing all references of one IP address to anoth-
er. Translation is performed as per RFC 1631.
netmask
A 32-bit bit mask which shows how an Internet address is to
be divided into network, subnet, and host parts. The netmask
has ones in the bit positions in the 32-bit address which are to
be used for the network and subnet parts, and zeros for the
host part. The mask should contain at least the standard net-
work portion (as determined by the address's class), and the
subnet field should be contiguous with the network portion.
non-ISDN line
Any connection from a CPE to a SPCS that is not served by D-
Channel signalling.
non-ISDN trunk
Any trunk not served by either SS7 or D-Channel signalling.
NT1
Network Termination 1. A unit that provides physical and
electromagnetic termination of the U-interface 2-wire trans-
mission line, converts between Layer 1 formats used at the U-
and T- reference points, and performs some maintenance
functions.
61202070L3-20 Express L128T S/T User Manual
Glossary
Glossary-5