Command Reference Guide

306 ● service vbr-nrt 3Com Router 5000 Family and Router 6000 Family
Command Reference
service vbr-nrt
Purpose Use the service vbr-nrt command to specify the service type of PVC as Variable
Bit Rate-Non Real Time (VBR-NRT) and specify the related rate parameters.
Syntax service vbr-nrt output-pcr output-scr output-mbs
Parameters output-pcr
Peak rate of ATM cell output in kbps. For the value
ranges of this parameter, see Table 1.
output-scr
Sustainable rate of ATM cell output in Kbps. Its value
ranges are the same as those of output-pcr.
output-mbs
Maximum burst size for ATM cell output, that is, the
maximum number of ATM cells that the output
interface can cache. It ranges from 1 to 512.
When 64 < SCR <70 and 475 = MBS = 512 hold, chip limitation can result in
configuration failure.
Default By default, the service type is UBR after creating a PVC.
Example Display how to create a PVC named "3Com" with VPI/VCI as 1/101.
[3Com-Atm1/0/0] pvc 3Com 1/101
Display how to specify the service type of the PVC as VBR-NRT and set the peak bit
rate of ATM cell to 100,000kbps, sustainable bit rate to 50,000Kbps, the maximum
burst size to 320 cells.
[3Com-atm-pvc-Atm1/0/0-1/101-3Com] service vbr-nrt 100000 50000 320
View This command can be used in the following views:
■ PVC view
Table 1 Value ranges of output-pcr
Interface type output-pcr
ADSL 64 to 640
GSHDSL For two-wire interfaces or four-wire interfaces in two-wire mode: 64
to 2312
For four-wire interfaces: 128 – 4624
ATMOC3 64 to 155000
ATM25 64 to 25600
ATME3 64 to 34000
ATMT3 64 to 44000
IMA-E1/T1 64 to 1904