ADTRAN Express L128, User Manual

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Glosssary
61202.070L1-1 Express L128/L128T User Manual 165
message
The Layer 3 information that is passed between the CPE and SPCS for signal-
ling.
multipoint line
A communications line having multiple cable access points.
Name Binding Protocol (NBP)
The AppleTalk transport-level protocol that translates a character string name
into the internet address of the corresponding socket client; NBP enables Ap-
pleTalk protocols to understand user-defined zones and device names by pro-
viding and maintaining translation tables that map these names to
corresponding socket addresses.
NAT
Network Address Translation occurs at the borders of stub domains. Its pur-
pose is to translate the IP address of passing packets by changing all references
of one IP address to another. 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 network
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 signal-
ling.
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 transmission line, converts between Lay-
er 1 formats used at the U- and T- reference points, and performs some main-
tenance functions.
phase jitter
In telephony, the measurement in degrees out-of-phase that an analog signal
deviates from the reference phase of the main data-carrying signal. Often
caused by alternating current components in a telecommunications network.