Technical data

TraverseEdge 2020 Applications and Engineering Guide, Chapter 3: System Applications
Page 3-54 Turin Networks Release 5.0.x
network, will cause the far end GbE PLM to transmit invalid 8B/10B codes on the far end GbE link. The
far end GbE PLM inserts invalid 8B/10B line coding (as opposed to turning off the laser) to indicate grace-
fully to the end system that a physical layer failure has occurred within the network.
3.10.6 Virtual Local Area Networks (VLANs)
The TE-2020 and TE-206 together allow flexible Ethernet networks to be set up that combine traffic segre-
gation and routing based purely on VLAN groups. They also allow both VLAN groups and Layer 2 Ether-
net switching technology to be utilized to implement more complex networks (for customer specific virtual
Ethernet networks for example).
Figure 3-49 VLAN Network
Virtual Local Area Networks (VLANs) allow multiple LANs to share a single WAN pipe without using IP
addresses to route packet streams. All ingress Ethernet packets are “tagged” with a VLAN ID. This VLAN
ID is used to delineate and route the packet streams to the remote end of the WAN network as well as toe-
nable each packet to be routed to different LAN destinations at aremote site. VLAN IDs can also be used to
allow multiple WAN connections to exit out a single LAN interface while still retaining full traffic separa-
tion. VLANs can be considered to provide the same degree of traffic segregation and aggregation for Eth-
ernetnetworks, as Frame Relay does for conventional TDM networks.
3.10.7 VLAN Tagging
In many cases, both customers and carriers will want to setup VLANs simultaneoiusly for different rea-
sons. Turin Networks Ethernet capability was designed to enable both customers and carriers to implement
VLANs to satisfy their own application needs. VLAN tagging is the way this is accomplished., and VLAN