Verilink AS2000: The Basics (880-502981-001) Product Manual - Manual (Page 164)

Acronyms and Definitions
Glossary-44 Verilink Access System 2000: Basics
Si Signal international—bits inserted
on E1 overhead frames and
timeslots reserved for international
use.
SI International System of Units.
signal and chassis ground connector
(TB1)
Connector on the Dual-line Shelf
(DLS) or Multi-line Shelf (MLS)
used to connect the shelf to the
proper ground.
signaling The exchange of electrical
information (other than by speech)
used specifically in establishing
and controlling connections and
management in a communications
network.
Simple Network Management Protocol
(SNMP)
A subset of TCP/IP, the accepted
industry-standard network
management protocol that uses a
system of agents and managers.
Each agent is responsible for
interacting with a certain MIB . The
manager can ask the agent for
data, or it can ask the agent to set
the value of some data.
slip Slip event—when the timing of a
signal being received changes in
an undesirable way.
SLIP See Serial Line Interface
Protocol (SLIP) .
slot (or plug) number The location of a card or module in
a Multi-line Shelf or Dual-line
Shelf .
smart jack The interface between a CSU and
the T1 circuit, provided by the NSP.
Sn Signal national—bits inserted on
overhead frames and timeslots
reserved for national use.
SNMP See Simple Network
Management Protocol (SNMP) .
soft parameters A parameter changed through
software rather than by changing
physical switches.
standby NCM or SCM A redundant NCM or SCM
controller within the node as a
backup controller unit.
statistical mulitiplexing When the data input from two or
more devices is interleaved onto a
single channel on an as-needed
basis rather than using dedicated
timeslots.