User`s guide

Glossary
GL-5
7800-A2-GB26-80
May 1999
Network Management System. A computer system used for monitoring and controlling
network devices.
Out Of Frame. An error condition in which frame synchronization bits are in error.
One or more of the analog parameter thresholds has been exceeded. The probable cause
is poor line conditions or improper threshold settings. Thresholds may be set through NMS
commands.
A local test causing the device to transmit and monitor for a particular test pattern. This
test disrupts the transmission of primary data.
A rapid or repeated shifting of the relative phase of a signal resulting in unwanted
distortion.
Payload Loopback. Loopback mode that loops the information received on the T1 network
interface back to the network after it has passed through receive and transmit framing
section.
Point-to-Point Protocol. A protocol for packet transmission over serial links, specified by
Internet RFC 1661.
Performance Report Messages. Messages indicating the current state of a T1 line as
specified by ANSI-T1-403.
Proxy Address Resolution Protocol. A technique for using a single IP address for multiple
networks. A device responds to ARP requests with its own physical address, then routes
packets to the proper recipients.
Permanent Virtual Circuit. The DSU’s in-band management channel that supports remote
management via a Telnet connection. It is the logical link, identified by a DLCI, used for
routing frames over the network from their source to their destination.
Quasi-Random Signal Source. A test pattern simulating a random pattern of digital ones
and zeros used to simulate normal transmission.
Rate Adaptive Digital Subscriber Line. A technique for the use of an existing twisted-pair
line that permits simultaneous POTS and high-speed data communication at adaptive
symmetric and asymmetric rates.
Robbed Bit Signaling. Signaling used for voice-call processing over a T1 line.
A test that sends a signal to the remote device to test the local device, the remote device,
and the circuit between them.
Repeater LoopBack. Loops the signal being sent to the network back to the DTE
Drop/Insert and data ports after it has passed through the framing circuitry of the device.
Remote Termination Unit. A DSL device installed at the customer premises.
Severely Errored Seconds. Usually defined as a second during which a specific number of
CRC errors was exceeded, or an OOF or other critical error occurred.
Serial Link Internet Protocol. Protocol for serial operation in an Internet network.
Service Level Verifier. A feature that monitors and ensures frame relay network service
levels.
Simple Network Management Protocol. Protocol for open networking management.
The modem is in an antistreaming condition. The RTS input to the modem was held ON for
a period exceeding the time selected by the RTS antistream configuration option.
A condition indicating the leased or Analog Private Line (APL) device is operating at a
speed below normal.
NMS
OOF
out of threshold
pattern test
phase jitter
PLB
PPP
PRM
proxy ARP
PVC
QRSS
RADSL
RBS
remote loopback
RLB
RTU
SES
SLIP
SLV
SNMP
streaming terminal
Sub-normal
Operating Speed