18
carry user priority information across bridged LANs in which individual LAN segments may be unable to
signal priority information (e.g., 802.3/Ethernet segments). 2) The Canonical Format Indicator (CFI) is
used to signal the presence or absence of a Routing Information Field (RIF) field, and, in combination
with the Non-canonical Format Indicator (NCFI) carried in the RIF, to signal the bit order of address
information carried in the encapsulated frame. 3) The VID uniquely identifies the VLAN to which the
frame belongs.
3.3 Applications
WAN
LAN1
LAN2
LAN3
LAN4
Group 1
Group 2
Group 3
Port-based VLAN
1
8
PWR
OK
WIC0
ACT/CH0
ACT/CH1
WIC0
ACT/CH0
ACT/CH1
ETH
ACT
COL
PWR
OK
WIC0
ACT/CH0
AC T/CH1
WIC0
ACT/CH0
ACT/CH 1
ETH
AC T
COL
SHDSL connection
with 2PVC
LAN1
LAN1
LAN2
LAN2
LAN3
LAN3
LAN4
LAN4
CO
CPE
SERVER
SERVER
1 2
3
4 5
6
7 8
9
*
8
#
1 2
3
4 5
6
7 8
9
*
8
#
VoIP
VoIP
802.1q VLAN
Summary of Contents for SHDTU03b
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