Information Technology Reference
In-Depth Information
time-division multiplexing (TDM)
A method of transmitting multiple channels of voice or
data over a single digital connection by sending data in specific time slots.
troubleshooting
A sequence of steps by which the possible causes of a problem, and the
possible steps to correct it, are determined and executed.
trunk port
A port on a Cisco switch specifically configured to transmit multiple VLANs.
Trunks are typically used between switch devices and in router-on-a-stick configurations.
user group (CUCM)
Associated with one or more roles. Users who members of a group
inherit the privileges of the role(s) associated with the group. Membership in multiple groups
may create conflicting privilege assignments; the enterprise parameter
Effective Access
Privileges for Overlapping User Groups and Roles
defines whether the effective privilege is
Maximum or Minimum.
virtual LAN (VLAN)
A configuration used to break a switch into multiple broadcast
domains and IP subnets.
VLAN Trunking Protocol (VTP)
A Cisco-proprietary protocol that replicates VLAN data-
base information to all switches participating in the same VTP domain.
voice expansion port
The integrated voice/WAN interface card (VWIC) port in all models
of the UC520 that allows for PSTN voice expansion. This port does not support WAN con-
nectivity.
Voice Profile for Internet Mail (VPIM)
A feature that allows one voicemail system to
exchange messages with another voicemail system.
VoiceView Express
An XML application that provides to subscribers GUI access to their
voicemail messages via the Services button on an IP phone.
