178 CHAPTER 6: DCC C ONFIGURATIONConfiguring DCC Timersand Buffer QueueLengthC-DCC and RS-DCC are available with some optional parameters. You mayconfigure them appropriately to improve on-demand dial efficiency.This section covers these topics:■ “DCC timers and buffer queue length” on page 178■ “Configuration procedure” on page 170DCC timers and buffer queue length■ Link idle-timeout timerA link idle-timeout timer starts upon setup of a link. When the timer expires, DCCdisconnects the link.■ Holddown timerA holddown timer starts upon disconnection of a link. The call attempt to bring upthis link can be made only after the timer expires. This is to prevent a remote PBXfrom being overloaded.■ Compete-idle timerIf all the channels are unavailable when DCC originates a new call, contentionoccurs.Normally, an idle-timeout timer starts upon setup of a link. If a call to anotherdestination address is placed at the same time, contention occurs. In this case,DCC starts a compete-idle timer to replace the idle-timeout timer for the link.When the idle time of the link reaches the setting of this compete-idle timer, thelink disconnects.■ Wait-carrier timerSometimes, the time that DCC waits for a connection to be established may varycall by call. To handle this situation, you may use a wait-carrier timer. A wait-carriertimer starts when a call is placed. If the connection is not established uponexpiration of the timer, DCC terminates the call.■ Buffer queue lengthIf no connection is available when a dial interface without a buffer queue receivesa packet, it will drop the packet. Configured with a buffer queue, the dial interfacewill buffer the packet until a connection is available for packet sending.Repeat this step to associatemultiple dial strings with thesame next-hop-addressdialer route protocol next-hop-address[ mask network-mask-length ] [ userhostname | broadcast ] * dial-number[ autodial | interface interface-typeinterface-number ] *RequiredTo do... Use the command... Remarks
