Chapter 5 Terminal Operation IP6702A TDMoEthernet
Loop Telecommunication International, Inc.
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Suggested buffer size: Jitter Tol (ms) + packet creation time (ms) + 2 (ms)
Packet creation time: Frames of packet x 0.125 (ms)
* Delay should be smaller than buffer size. Also, the difference between buffer size and
delay should be larger than the time that it takes to reconstruct a packet (otherwise an
overrun may occur when the packet arrives). Configuring the Jitter Buffer parameters
correctly avoids under-run and overrun situation. Under-run occurs when the Jitter Buffer is
empty (the entering rate is lower than the exiting one). In case of an under-run event, the
chip transmits conditioning data instead of actual data towards the TDM interface. Overrun
occurs when the jitter buffer is full and there is no room for new data to enter (the entering
rate exceeds the exiting one). Under-run and overrun require special treatment from the
chip HW, depending on the bundle type.
buffer size
delay
This area is empty and
can be used to store
incoming bursts
This area is full and
there is still data to
send on the line if
incoming data is
missing due to
network delays.
Figure 5-8 Jitter Buffer Diagram
5.4.
Firmware Transfer
The full menu path for Firmware Transfer is as follows:
O
> Logon
W
>Firmware Transfer
The screen of Firmware Transfer will show as below.
