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PEM
Power Entry Module. A module that provides 48V power isolation and distribution,
overcurrent protection, and power filtering and monitoring for the Hotwire 8820 GranDSLAM
chassis.
Plain Old Telephone Service. Standard telephone service over the PSTN with an analog
POTS
bandwidth of less than 4 KHz.
A device that filters out the DSL signal and allows POTS frequencies to pass through.
POTS splitter
Point-to-Point Protocol. A protocol for packet transmission over serial links, specified by
PPP
Internet RFC 1661.
Public Switched Telephone Network. A network shared among many users who can use
PSTN
telephones to establish connections between two points. Also known as dial network.
Rate Adaptive Digital Subscriber Line. A technique for the use of an existing twisted pair line
RADSL
that permits simultaneous POTS and high-speed data communication at adaptive
symmetric and asymmetric rates.
A subscriber line technology providing up to 1 Mbps throughput. Compliant with
ReachDSL
ANSI T1.417, ReachDSL guarantees a minimum rate of 256 kbps at 18 kft.
A device that connects LANs by dynamically routing data according to destination and
router
available routes.
SCM
Shelf Concentration Module. A circuit card that provides connectivity between DSL devices
and an ATM uplink.
SDSL
Symmetric Digital Subscriber Line. A technique for the use of an existing twisted-pair line
that permits high bandwidth, bidirectional transmission.
SIM
System Interface Module. A module that provides user interface connections on the front of
the Hotwire 8820 GranDSLAM chassis.
SN
Service Node. The endpoint modem at the customer premises, also known as a Remote
Termination Unit (RTU).
SNMP
Simple Network Management Protocol. Protocol for open networking management.
TCP
Transmission Control Protocol. An Internet standard transport layer protocol defined in
STD 7, RFC 793. It is connection-oriented and stream-oriented.
TCP/IP
Transmission Control Protocol/Internet Protocol. The dominant protocol in the worldwide
Internet, TCP allows a process on one machine to send data to a process on another
machine using the IP protocol. TCP can be used as a full-duplex or one-way simplex
connection.
Time Division Multiplexing Symmetric Digital Subscriber Line. A technique for the use of an
TDM SDSL
existing twisted-pair line that permits high bandwidth, bidirectional transmission.
Virtual terminal protocol in the Internet suite of protocols. Allows the user of one host
Telnet
computer to log into a remote host computer and interact as a normal terminal user of the
remote host.
Software that allows a PC to mimic the signals of a specific type of terminal, such as a
terminal emulation
VT100 or 3270, to communicate with a device requiring that terminal interface.
Trivial File Transfer Protocol. A standard TCP/IP protocol that allows simple file transfer to
TFTP
and from a remote system without directory or file listing. TFTP is used where FTP is not
available.
8820-A2-GN20-30
March 2001
Glossary
GL-3
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