Glossary
GL-3
8000-A2-GB20-20 November 1997
DSL margin is defined as the additional noise measured in db that would need to be added
to (or if the margin is negative, subtracted from) the existing noise present on a given DSL
loop to bring the Bit Error Rate (Ber) to IE-7 (10 7) . Unless the noise source is defined
(such as 24 BRI disturbers or 24 DSL disturbers, it is assumed to be Noise Model A (white
noise).
Management Communications Controller Card. The card in a HotWire DSLAM system or
stack that is used primarily for monitoring and configuring the HotWire DSLAM.
Management Information Base. A collection of information (e.g., configuration, status, and
statistical data) within an SNMP agent that forms a database of information about the
agent which is accessible from the NMS manager. MIB II is the current standard.
Combine many low-speed data sources into a single, high speed serial data stream. The
data is coded at transmission, and decoded at reception. Interleave or simultaneously
transmit two or more messages on a single circuit. Some multiplexing techniques include
Frequency Division Multiplexing (FDM), Time Division Multiplexing (TDM), and Statistical
Multiplexing (Stat MUX).
Network Access Provider. The NAP provides a transit network service permitting
connection of service subscribers to Network Service Providers (NSPs). The NAP is
typically the network provider (e.g., a Regional Bell Operating Company, an Alternate
Local Exchange Carrier) that has access to the copper twisted pairs over which the DSLs
operate.
Network Management System. The system responsible for managing a portion of the
network. An NMS communicates to a Simple Network Management Protocol (SNMP)
agent via SNMP to obtain (get) or configure (set) specific parameters or variables within
control of the SNMP agent (e.g., DCE Manager).
Network Service Provider. NSPs can be either public data network providers (i.e., Internet
Service Providers) or private data network providers (i.e., corporate intranets) who provide
network services based on the Internet Protocol (IP). In some cases, the NSP and the
NAP can be a single network provider.
Used in this document to refer to a block of data sent across an IP switching network.
IP address used to indicate directly connected systems.
An IP-based application used to test reachability of destinations by sending an ICMP echo
request and waiting for a reply. The ping program is supported from both the DSL and
MCC cards.
Plain Old Telephone Service.
A device that filters out the DSL signal and allows the POTS frequencies to pass through.
This device can be installed at the Central Office or Customer Premises.
Point-to-Point Protocol. A protocol for framing IP when sending across a serial line. It
allows a computer to connect to the Internet using a standard dial-up telephone line and a
high-speed modem.
Proxy Address Resolution Protocol (ARP). The technique in which one machine, usually a
router, answers ARP requests intended for another by supplying its own physical address.
By pretending to be another machine, the router accepts responsibility for forwarding
packets. The purpose of proxy ARP is to allow a site to use a single IP network address
with multiple physical networks.
See Authentication Server.
Rate Adaptive Digital Subscriber Line. A transmission technology that supports both
symmetric and asymmetric applications on a single twisted-pair telephone line and allows
adaptive data rates.
margin
MCC Card
MIB
Multiplex
NAP
NMS
NSP
Packet
Peer Address
Ping
POTS
POTS Splitter
PPP
Proxy ARP
RADIUS
RADSL