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Appendix D. Glossary
D-10 TSU IQ+ User Manual 61200275L1-1
near end
The unit on-site.
network interface (NI)
The point of interconnection between the TSU IQ+ unit and the carrier's T1 net-
work.
out-of-band
Signaling that is separated from the channel carrying information (voice, data,
video, etc.). Typically the separation is accomplished by a filter. The signaling
includes dialing and other supervisory signals.
packet
A message containing both control information and data. The control informa-
tion is used for routing the packet through a network to its final destination.
Contrast with frame relay frame.
packet-switching network
A telecommunications network based on packet-switching technology, wherein
a transmission channel is occupied only for the duration of the transmission of
the packet. Contrast with frame relay network.
parameter
A numerical code that controls an aspect of terminal and/or network operation.
Parameters control such aspects as page size, data transmission speed, and tim-
ing options.
PRI
Primary rate ISDN.
PRM
performance report message. A message sent to the network interface (NI) once
per second over the FDL which contains performance monitoring and status
information. This is available in ESF only.
ping
An internet protocol standard that provides loopback on demand for any device
in an IP network. One device "pings" another by sending a loopback request to
the device's IP address.