Lucent Technologies SLC ConnectReach User & Service Manual page 530

Glossary 363-208-050
sppp — Network T1 PPP interface code; used in Interface statistics.
Subnet — Logical partitions of a single network.e to send alarm andstatus
T
T1 — A digital line that carries data at 1.544 Mb/s. Fractional T1 refers to data transmission between 56
kb/s and 1.544 Mb/s. The SLC ConnectReach system provides twenty-four 64-kb/s "fractions," or
channels, which may be allocated for either voice or data traffic.
T1 Multiplexer — A device that can multiplex 24 channels at 64 kb/s onto a single digital signal.
TCP — Transport Control Protocol. The primary transport-layer protocol of the TCP/IP protocol stack.
TDM — Time Division Multiplexing. A multiplexing technique that allows all channels to use one
transmission link, but not at the same time. Each channel is sampled in sequence resulting in interleaving
of samples from each channel in time. The sampling rate is 8,000 times per second.
Telnet — A TCP/IP protocol offering a line-oriented connection over the LAN/WAN. Telnet is typically used
to remotely log on to an Internet device or host.
Tip — One conductor of a telephone wire pair, designated by T.
Tip Status — Transmission state of an unconfigured channel. In the channel-bank menu, the tip status is
either busy or idle.
tone1k — A mode for voice channel; in this mode, a phone attached to the channel will emit an audible
1-kHz tone. Typically, this mode is used for diagnosis.
tooshort — In statistics reports, such as IP statistics, the number of packets that are below the minimum
length.
toosmall — In statistics reports, such as IP statistics, the number of packets with less than the minimum
amount of data.
TR08—A defacto Bellcore standard for adapting to a single T1 link.
Trunk — A transmission channel connecting two switching devices.
Trunk Signaling — The handshaking used to communicate on a trunk such as loop-start and ground-
start.
TTL — Time-To-Live. Mechanism used in IP protocol to ensure that errant packets are killed. Typically,
TTL begins at 255 seconds when a packet arrives at a device, and decrements until the packet exits. At 0
(Time-To-Die, or TTD), if the packet has not exited, it is killed.
GL-12
Issue 4 June 2002