On Thu, 9 Dec 2004, Steven Critchfield wrote: > Digium cards need 1000 interupts per card per second due to the lack of > onboard buffer. The buffer was left off of the design to keep the design > simple and therefore inexpensive. All the cards present 8 bits of data > per channel during that interupt and as all telephony is 8000 bits per > channel per second.... 8000/8 = 1000 service needs per second. An > interupt is the way hardware requests service.
A channel is 64000 bits per second or 8000 8-bit samples. The Digium cards transfer 8 samples or 64 bits per interrupt per channel. Another important reason for the small buffer is to minimize the latency of a call switched through Asterisk. Larger buffers would imply larger latnecies and latency is the enemy of voice communication for several reasons that are listed in the wiki. Peter _______________________________________________ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
