Allocation of switch ports to the DSL ports

Depending on the model, devices with an integrated switch can enable some of the LAN ports to be used as additional WAN ports for connecting to external DSL modems. These ports are listed in the interface table as separate DSL interfaces (DSL-1, DSL-2, etc.). The DSL ports are activated as DSL interfaces in teh WAN interfaces list, configured with the up- and downstream rates and allocated to the switch ports in the LAN interfaces list (example: LANCOM Wireless 1811DSL)

• The column 'Port' contains the description of the associated port as marked on the back cover of the device.
• The utilization of the port is listed In the column 'Allocation':
  • None: The port is deactivated
  • LAN-1: The port is allocated to the LAN
  • DSL-1, DSL-2, ... : The port is allocated to one of the DSL interfaces
  • Monitor: The port is a monitor port, i.e. everything received at the other ports is output via this port. A packet sniffer such as Ethereal can be connected to this port, for example.

The allocation of DSL ports to the Ethernet ports can be chosen freely. A well-arranged assignment can be achieved by assigning the DSL ports in reversed order to the ports on the switch (for example: LANCOM Wireless 1811 DSL):

1. LAN4 / DSL-2
2. LAN3 / DSL-3
3. LAN2 / DSL-4
4. LAN1 / LAN-1: This port remains reserved for the LAN.
5. WAN / DSL-1: (dedicated WAN port for the device)

If the device is equipped with more than one DSL port, the DSL port to be used is entered in the DSL-Broadband-Peers list:

1. If no port is defined (or port "0"), the LANCOM selects the port after the one chosen for the connection's communication layer.
   • If Layer-1 is set with 'AAL-5', then the ADSL interface is chosen.
     • If Layer-1 is set with 'ETH', then the first DSL port (i.e. DSL-1) is chosen.
   • If a particular port is defined (not "0"), then it will be used for the connection.
     Note: Observe that the communication layer set for the connection over this port in Layer 1 is set to 'ETH'.
   • To enable channel bundling via multiple DSL interfaces, the appropriate ports are entered into the peer list for the remote station (as a comma-separated port list '1,2,3' or as a port range '1-3'). With a port list, the bundled channels will be established in the given order; only in case of error will the channels be tested in ascending order. With a port range, the channels are always established in ascending order.
     • In the list of Ethernet ports, the ports must be switched to DSL port.
     • The DSL ports have to be activated as DSL interfaces in the list of the WAN interfaces and need to be configurated with the correct up- and downstreams.
     • In the layer used for the connection, a bundling method has to be activated that is also supported at the remote site.
     • To configure channel bundling for an internal ADSL interface, the ADSL port '0' is entered into the list of ports at the top of the list (e.g. '0,1,2,3' as port list or '0-3' as port range). In the remote device, the communications layer must be set to Layer 1 'AAL-5'.
       Note: An entry in the peer list can contain various ports (e.g. ADSL and Ethernet), but it can only reference one communications layer in which just one layer-1 protocol can be defined. For bundled communications over ADSL and Ethernet ports, however, two different layer-1 protocols are required. For this reason, layer 1 is set to 'AAL-5' in these cases. As only one ADSL interface can exist in the devices, all of the interfaces bundled into this are automatically changed to layer 1 with 'ETH' for Ethernet DSL ports. This automatic change of the layer can only succeed if the ADSL interface is the first one to be selected for bundled connections.
     • For devices with a built-in ADSL modem and an additional Ethernet interface (DSL or DSLoL), it is clear which ports are used for bundling. In this case it is not necessary to enter the ports into the remote site list. These devices always internally assume a port list '0,1' so that the internal ADSL interface is the first one to be used for bundling.
     Note: For Multi-PPPoE, multiple PPPoE connections share one physical DSL connection. With Multi-DSL, several PPPoE connection are divided between the available DSL interfaces. The maximum possible number of parallel connections is limited to 8 channels.