Mitel SX-2000 EL Information Manual page 256

SX-200 General Information Guide
Tie Trunks
Tie trunks directly interconnect two systems together. This enables a station, terminated on
one of the systems, to be interconnected to any other station, terminated on the other
system.With tandem trunking the calling party can be extended through more than one node
of the network.
Tip Lead
The first wire of a telephone pair, originally named because it was the lead connected to the
tip of a telephone plug. The second wire of the pair (called the ring lead) was connected to the
ring of the plug.
Toll Control
Toll control restricts the users to certain trunk routes and denies the use of specific directory
numbers. It is part of the ARS feature. Each user is assigned a COR which is associated with
the trunk route tables in ARS and determines what degree of access the particular station has
to the trunk network.
Traveling Class Marks
In a private network, the caller's class of service can be passed to the destination node to
control access to services.
UPS
Uninterruptible power supply.
Via Net Loss (VNL)
The VNL plan automatically applies gain or attenuation (loss) in a predetermined manner to
network trunk and toll connections at the switching node points. This results in an acceptable
transmission grade of service to subscribers. This term is used in the transmission loss and
level plans which are employed within the North American public and private telephone
networks.
Wink Start
The wink start feature applies generally to tie trunk circuit operation. When an incoming trunk
is seized it may be necessary to prevent the transmission of any digit sequences, until the
incoming trunk equipment is ready to receive these digits. When the incoming trunk equipment
is ready to receive the digits, a wink start condition is sent from the incoming end to the
originating end of the trunk. The distant termination can now send digit sequences over the
trunk.
242 Revision A 50003510