3com 5500-ei pwr Instruccion De Instalación

 

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Set the DSCP precedence to 46.  

You can adjust the QoS scheme for voice traffic according to the precedence of the voice traffic marked 

by the switch. Alternatively, you can modify the precedence of voice traffic as needed at the command 

line interface to apply an existing QoS scheme to voice traffic.  

 

For more information about CoS and DSCP precedence values, refer to the QoS-QoS Profile part of the 

manual.  

 

A port can work in automatic voice VLAN assignment mode or manual voice VLAN assignment mode. 

You can configure the voice VLAN assignment mode for a port according to data traffic passing through 

the port. 

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Automatic voice VLAN assignment mode. An Switch 5500-EI Ethernet switch automatically adds a 

port connecting an IP voice device to the voice VLAN by learning the source MAC address in the 

untagged packet sent by the IP voice device when it is powered on. The voice VLAN uses the aging 

mechanism to maintain the number of ports in the voice VLAN. When the aging timer expires, the 

ports whose OUI addresses are not updated (that is, no voice traffic passes) will be removed from 

the voice VLAN. In voice VLAN assignment automatic mode, ports can not be added to or removed 

from a voice VLAN manually. 

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Manual voice VLAN assignment mode: In this mode, you need to add a port to a voice VLAN or 

remove a port from a voice VLAN manually. 

Tagged packets from IP voice devices are forwarded based on their tagged VLAN IDs, whether the 

automatic or manual voice VLAN assignment mode is used.  

 

If the voice traffic transmitted by an IP voice device carries VLAN tags, and 802.1x authentication and 

guest VLAN is enabled on the port which the IP voice device is connected to, assign different VLAN IDs 

for the voice VLAN, the default VLAN of the port, and the 802.1x guest VLAN to ensure the effective 

operation of these functions.