Cisco Cisco IOS Software Release 12.2(8)T

Router(config-if-atm-vc)#

average-rate [burst]

Configures the PVC for variable-bit-rate real-time 
(VBRrt) (voice) traffic. Guidelines for setting the 
peak rate, average rate, and burst size are as follows:

Peak rate—If it does not exceed your carrier’s 
allowable rate, set to the line rate (for example, 
1536 kbps for T1-ATM).

Average rate—Calculate according to the 
maximum number of calls the PVC will carry 
times the bandwidth per call. The following 
formulas give you the average rate in kbps:

G.711 with 40 or 80 byte sample size—max 
calls x 85

G.726 with 40 or 80 byte sample size—max 
calls x 43

G.729 with 20 byte sample size—max calls x 22

G.729 with 30 byte sample size—max calls x 15

If voice activity detection (VAD) is enabled, the 
bandwidth usage is reduced by as much as 
12 percent with the maximum number of calls 
in progress. With fewer calls in progress, 
bandwidth savings are less.

Burst size—Set the burst size as large as 
possible, and never less than the minimum burst 
size. 

Guidelines are as follows:

The minimum burst size is 4 x the number of 
voice calls.

The maximum burst size is the maximum 
allowed by the carrier.

You can calculate the value using the calculator 
at the following URL:

http://www-vnt/SPUniv/DSP/Codec_Calc1.asp

Router(config-if-atm-vc)# oam-pvc [manage]

[frequency]

(Optional) Configures transmission of end-to-end 
F5 OAM loopback cells on a PVC, optionally 
specifies the number of seconds between loopback 
cells, and optionally enable operation, 
administration, and maintenance (OAM) 
management of the connection. 

The range for frequency is 0 to 600. The default is 
10.