Two methods of channel bundling

Static channel bundlingIf a connection is established with static channel bundling, the LANCOM tries to establish the second B channel immediately after setting up the first B channel. If this fails, for example because this channel is already occupied by another device or by another connection in the LANCOM, the connection attempt is automatically and regularly repeated until the second channel is available.
Dynamic channel bundlingIn the case of a connection with dynamic channel bundling, the LANCOM initially establishes just one B channel and begins the data transfer. If it then determines that the connection throughput rate continually exceeds a certain threshold value, it tries to add the second channel. If the second channel is established and the data throughput rate drops below the threshold value, the LANCOM waits for the short hold time set for B2 and then automatically closes the channel again. This ensures that the charges units are used to the full, assuming that the charge information is transmitted during the connection. The LANCOM only uses the second B-channel if and as long as it really needs it.