Nortel 15000 Terminology page 137

trivial file transfer protocol (TFTP)
A protocol that governs transferring files between nodes without protection
against packet loss.
trunk
The generic term for a physical connection, not a Nortel Multiservice Switch
network-specific term.
trunk conditioning (TC)
A technique whereby a constant bit pattern is applied to specific time slots to
indicate downstream that the system has detected a fault in the upstream data
path.
trunking (acknowledged)
The receiving node confirms the quality of the received packets and requests
retransmission of corrupted packets.
trunking (unacknowledged)
The receiving node does not acknowledge the receipt of packets.
TTC2M
Japanese Telecommunication Technology Committee 2 Mbit/s PBX-TDM
interface, referencing TTC JJ-20.10, JJ-20.11, JJ-20.12.
tunneling
A protocol encapsulation process that embeds propriety protocols, such as
MPANL, into a carrier protocol, such as frame relay.
Type 2.1 (T2.1) node
A local exchange node (LEN) node.
type of service
The 8-bit field in an IP packet header used for specifying differentiated service
parameters for the IP packet. The 6 most significant bits of this field are also
known as the
U-plane
In frame relay, the data transfer protocol or U-plane is the protocol used for the
transfer of the actual user data. The protocol is based on T1.618, which is
based on a subset of ANSI T1.602 (LAPD). For more information, see
NN10600-900 Nortel Multiservice Switch 7400/15000/20000 Frame Relay
Technology Fundamentals.
UBR
See unspecified bit rate (UBR) (page
Copyright © 2006, Nortel
- 137 -
List of terms
differentiated services code point (page 42)
Nortel Multiservice Switch 7400/15000/20000
Terminology
NN10600-005 7.2S1 Standard
PCR7.2 and up March 2006
(DSCP).
138).
Nortel Confidential