Figure 3.12 Internal Switch
For single-channel modems the DSL channel is strictly mapped to WAN1, while the E1 interface
is strictly mapped on WAN2.
Figure 3.13 Internal Switch for single-channel devices (FG-PAM-SRL-2E1B/4Eth-RP,V90)
A group of LANx Ports (Ethernet interface) means the LAN port connector on the front panel or
backplane that can serve as a Trunk port, Access port or Mixed port.
The Trunk port is a port where all present packets have the VLAN format, namely, the Ethernet
frame with a header, determining the number of the VLAN and QoS. In Trunk mode, only tagged
frames pass into and out of LANx port, frames are allowed to pass on per-VLAN basis. This
means that special equipment supporting VLAN is connected to the Trunk port. A PC with a
standard network interface card cannot be connected to the Trunk port.
The Access port is a port where all present packets have a standard Ethernet format (without
the additional two bytes for the header). It means that only untagged frames pass into (ingress)
and out of (egress) any LANx port. On ingress, frames are assigned with a default VLAN tag
(configured by VID and QoS commands). On egress, only frames with VLAN equal to the default
VLAN of the port are allowed, and this tag is removed. A PC with a standard network interface
card can be connected to the Access port.
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