VLL Services
7705 SAR OS Services Guide Page 249
SAP cem Commands
cem
Syntax cem
Context config>service>cpipe>sap
Description This command configures the circuit emulation service parameters on a Cpipe.
This command is blocked for all SAPs except for E1, DS1 and n × 64 kb/s channels configured for
encap-type cem.
packet
Syntax [no] packet
Context config>service>cpipe>sap>cem
Description This command enables the context to configure packet parameters on the SAP.
jitter-buffer
Syntax [no] jitter-buffer value | payload-size size
Context config>service>cpipe>sap>cem>packet
Description This command defines the size of the receive jitter buffer for the circuit emulation service SAP.
Default The default value varies depending on the SAP bandwidth, as follows:
• 5 ms, where SAP bandwidth ≥ 16 DS0s (1024 kb/s)
• 8 ms, where SAP bandwidth is between 5 and 15 DS0s (between 320 and 960 kb/s)
• 16 ms, where SAP bandwidth is between 2 and 4 DS0s (between 128 and 256 kb/s)
• 32 ms, where SAP bandwidth = 1 DS0 (64 kb/s)
Parameters value — This parameter describes the size of the receive jitter buffer, expressed in milliseconds. The
range of supported values is 2 to 250 ms. Setting the value to 0 sets the default (depends on SAP
bandwidth). The buffer size must be set to at least 3 times the value of the packetization delay
and no greater than 32 times the value of the packetization delay.
To calculate the size of the buffer (in bytes), multiply the value of the buffer size (in ms) by the
SAP TDM bandwidth (in bits per second) and divide by 8. After the initialization of the circuit
emulation service, transmission of TDM data begins when the buffer is half full (50%).
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