How to configure channel bundling

Configuring channel bundling for a connection involves three settings:

1. For the remote site, select a communication layer from the layer list that has bundling enabled in the layer-2 options. Choose from the following layer-2 options:
   • compr. according to the LZS data compression procedure (stac) reduces the amount of data if the data hasn't been compressed already. This method is also supported by routers from other manufacturers and by ISDN adapters on Windows operating systems.
   • bundle uses two B channels per connection.
   • bnd+cmpr uses both compression and channel bundling and provides the maximum possible data transmission performance.
2. Now create a new entry in the Remote sites list. Pay attention to the short hold times for the connection. Please observe the following rules:
   • The B1 short hold time should be set at a value large enough to prevent the connection being dropped prematurely if no packets were transmitted for a brief period. Experience has shown that values between 60 and 180 seconds are a good basis which can be adapted as required during operation.
   • The B2 hold time decides whether channel bundling is static or dynamic (see above). With a B2 hold time of '0' or '9999’ bundling is static, whereas values in between permit dynamic channel bundling. The B2 hold time specifies how long data throughput can be below the threshold for dynamic channel bundling without the second B channel being disconnected automatically.
3. In the router interface list, the entry for the Y connection determines what happens when channel bundling is in operation and a request for a second connection arrives.Console: Setup > WAN > Router-Interface-List
   • Y connection on: The router interrupts channel bundling to establish the second connection to the other remote device. If the second channel becomes free again, it is automatically used for channel bundling again (always for static bundling, when required for dynamic bundling).
   • Y connection off: The router maintains the existing bundled connection; the second connection must wait.
   Important: Please note that channel bundling incurs costs for two connections. No further connections can be made over LANCAPI! Only use channel bundling when the full transfer speed is required and used.