Lucent Technologies SLC ConnectReach User & Service Manual page 526

Glossary 363-208-050
M
Margin — The difference (in dB) between existing noise and acceptable noise.
Master — A module that operates at the central control point.
MDS — Metallic Distribution Shelf. A two-shelf assembly that provides control and distribution for
DS0-based metallic services using common units and channel units. It also provides control and
distribution for DS0-based 12- and 24-line fiber-in-the-loop services using common units and distant
terminal Servers.
MSB — Most Significant Bit/Byte.
MTU — Maximum Transmission Unit. Largest unit data that can be transported on a transmission link.
N
NAT — 1HWZRUN $GGUHVV 7UDQVODWLRQ $Q ,QWHUQHW VWDQGDUG WKDW DOORZV D /$1 WR XVH RQH VHW RI ,3
addresses for an internal traffic and another set of IP addresses for external traffic.
Netmask — $OVR FDOOHG VXEQHW PDVN :KHQ WKLV YDOXH LV YLHZHG DV D ELW ELQDU\ QXPEHU WKH KLJK ELWV
have 1's. These 1's "mask off" the network and host number.
Network Number — 7KH KLJK ELWV RI DQ ,3 DGGUHVV ZKLFK FRUUHVSRQG WR WKRVH ELWV LQ WKH DVVRFLDWHG
VXEQHW PDVN ZKLFK KDYH ¶V
NLOC — Loopback - toward network side at master unit.
NOC — Network Operations Center.
NREM — Loopback - toward network side at slave unit.
NTP — Network Time Protocol. Developed to provide an accepted concept of time among Internet hosts
around the world.
Null modem — Small box or cable used to join computing devices directly, rather than over a network.
NVRAM — Non-Volatile Random Access Memory. A type of memory that retains its contents when power
is turned off.
GL-8
Issue 4 June 2002