Ericsson HL950 Administrator's Manual page 159

Multi Service Edge Device HL950
Administrator's Guide
VC – Virtual Circuit
A communications link that behaves like a dedicated point-to-point circuit, even though it is not. Data
packets are delivered to the user in guaranteed sequential order, as if they were sent over a true point-
to-point circuit.
VC – Virtual Channel (ATM)
VCC – Virtual Channel Connection
VCI – Virtual Channel Identifier
A unique numerical tag that is defined by a 16-bit field in the ATM cell header and identifies a virtual
channel over which the cell is to travel.
VCMux – VCC Multiplexing
VID – VLAN IDentification number
VLAN – Virtual LAN
A network of computers that behave as if they are connected to the same wire even though they may
actually be physically located on different segments of a LAN. VLANs are configured through
software rather than hardware, which makes them extremely flexible.
VoIP – Voice over IP
An Internet telephony product.
VP – Virtual Path
A logical communication channel that is available across a physical cell relay interface and that can
carry one or more virtual channels.
VPI – Virtual Path Identifier
An 8-bit value used to identify an ATM path. The VPI is part of the header of an ATM cell. The VPI
is assigned on connection setup by the devices at the two ends of a hop. Multihop VPCs use multiple
VPIs to go from source to destination. Each switch that the VPCs traverses cross-connects the VPC
from one port and VPI to another port and VPI.
VPN – Virtual Private Network
Is a private connection that sends private data traffic over the Internet. This lets organizations extend
network service over the Internet to branch offices and remote users creating a private WAN (Wide
Area Network).
W
WAN – Wide Area Network
WIF – WAN InterFace module
X
X.25
A popular standard for packet-switching networks which defines layers 1, 2 and 3 in the OSI
Reference Model.
Page 159 (159) EN/LZT 108 5995 R3
June 2003