ZyXEL Communications IES-1248-71, Руководство пользователя

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Chapter 56 Virtual Channel Management
IES-1248-71/73 User’s Guide
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This command creates a virtual channel profile. After you create a virtual channel profile, you
can assign it to any of the ADSL ports on any of the ADSL IES-1248 in the IES-1248.
The following example creates a virtual channel profile named gold that uses LLC
encapsulation. It uses constant bit rate and has the maximum rate (peak cell rate) set to
300,000 cells per second. The acceptable tolerance of the difference between a cell’s transfer
delay and the expected transfer delay (CDVT) is set to 5 cells.
The following example creates a virtual channel profile named silver that uses VC
encapsulation. It uses real-time variable bit rate and has the maximum rate (peak cell rate) set
to 250,000 cells per second. The acceptable tolerance of the difference between a cell’s
transfer delay and the expected transfer delay (CDVT) is set to 5 cells. The average cell rate
that can be transmitted (SCR) is set to 100,000 cells per second. The maximum number of
cells that the port is guaranteed to handle without any discards (BT) is set to 200.
The following example creates a virtual channel profile named economy that uses LLC
encapsulation. It uses unspecified bit rate and has the maximum rate (peak cell rate) set to
50,000 cells per second. The acceptable tolerance of the difference between a cell’s transfer
delay and the expected transfer delay (CDVT) is set to 100 cells.
56.2.3 Delete Virtual Channel Profile Command
Syntax:
ras> adsl vcprofile delete <vcprofile>
<pcr> =
Peak Cell Rate (150 to 300000), the maximum rate (cells per
second) at which the sender can send cells.
[cdvt] =
Cell Delay Variation Tolerance is the accepted tolerance of the
difference between a cell’s transfer delay and the expected
transfer delay (number of cells). 0 to 255 cells or * (means 0).
<vbr(rt-
vbr)|nrt-vbr> =
The real-time (vbr) or non real-time (nrt-vbr) Variable Bit Rate
ATM traffic class.
<scr> =
The Sustained Cell Rate sets the average cell rate (long-term)
that can be transmitted (cells per second). SCR applies with the
vbr traffic class.
<bt> =
Burst Tolerance this is the maximum number of cells that the
port is guaranteed to handle without any discards (number of
cells). BT applies with the vbr traffic class.
Figure 263 Set Virtual Channel Profile Command Example 1
ras> adsl vcprofile set gold llc cbr 300000 5
Figure 264 Set Virtual Channel Profile Command Example 2
ras> adsl vcprofile set silver vc vbr 250000 5 100000 200
Figure 265 Set Virtual Channel Profile Command Example 3
ras> adsl vcprofile set gold llc cbr 50000 100