Analog Devices CRA-200 - Manual (Page 6)

_____________________________ CRA-200 Quick Installation Guide
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Page: 6 of 7
to the device’s LAN port). Therefore, it is important that you
consider the number of total phone lines you will be attaching to
each CRA‐200 device in addition to the two lines that are already
available. In the sample configuration shown below, where you
have one CRA‐200 box with VPN enabled and two additional
Internet phone devices for a total of 4 phone lines, a 128 Kbps
Internet connection will allow for no more than 4 simultaneous
phone calls at a given time when using codec G.729/ Latency
Configuration of 60ms (see page 10 for a brief explanation of
Codec Latency Configuration ).
Recommended Number of Simultaneous Calls
The following chart depicts a general guideline range for the
recommended maximum number of simultaneous calls when
VPN capability is enabled for each codec/Latency configuration.
The amount of allowable simultaneous phone calls and its call
quality are directly related to bandwidth availability and its
utilization.
DSL
Speed 729 90ms 729 60ms 729 30ms
128k
4-6 max.
calls
4-5 max.
calls 2-3 max. calls
256k 10-12 8-10 5-6
384k 17-19 13-15 8-9
512k 23-25 18-20 11-13
768k 36-38 28-30 17-19
1024k 48-51 38-40 23-26
DSL
Speed 723 90ms 723 60ms 723 30ms
128k 5-7 4-5 2-3
256k 12-14 9-11 5-6
384k 18-20 15-17 8-9
512k 26-28 20-22 11-13
768k 41-43 32-34 17-19
1024k 56-58 43-45 23-26