Given a VoIP network with these attributes:
Codec: G.711
WAN bandwidth: 768Kbps
Packet Header: 6 bytes
Payload: 160 bytes
CRTP: No
How many calls can be made?
A.
7 calls
B.
13 calls
C.
8 calls
D.
9 calls
E.
11 calls
How many calls can be made?
Given a VoIP network with these attributes:
Codec: G.711
WAN bandwidth: 768Kbps
Packet Header: 6 bytes
Payload: 160 bytes
CRTP: No
How many calls can be made?
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)
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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