6 Comments on “How many calls can be made?”

1. phasersonstun says:

   March 31, 2012 at 7:57 pm

   This specific example is worked out on P552.

   # Calls = WAN BW / BW per call
   WAN BW is 768Kbps (given)
   BW per call = call packet size * call packet rate

   call packet size = L2 Header + (network and transport header) + payload
   L2 header = 6B (given)
   network and transport header = 40B (because no CRTP)
   payload = 160B (given

   packet rate = codec bit rate / voice payload size (codec specific)

   Result:
   BW per call = 82.4 kbps
   # Calls = 9 (rounding to nearest integer)

   
   
   
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2. Senior says:

   May 9, 2012 at 9:07 am

   I always find these kind of questions very tricky. In many documents Cisco advises not to use more than 70% of the bandwidth because of the signaling, routing protocols and other traffic on the link.

   
   
   
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