3com 5500-ei pwr Instrução De Instalação

 

1-3 

tag to communicate with the voice gateway. In this case, the port connecting to the IP phone must 

be configured to allow the packets tagged with the voice VLAN tag to pass.  

 

z 

An untagged packet carries no VLAN tag. 

z 

A tagged packet carries the tag of a VLAN. 

 

To set an IP address and a voice VLAN for an IP phone manually, just make sure that the voice VLAN ID 

to be set is consistent with that of the switch and the NCP is reachable to the IP address to be set. 

Switch 5500-EI series Ethernet switches determine whether a received packet is a voice packet by 

checking its source MAC address against an organizationally unique identifier (OUI) list. If a match is 

found, the packet is considered as a voice packet. Ports receiving packets of this type will be added to 

the voice VLAN automatically for transmitting voice data.  

You can configure OUI addresses for voice packets or specify to use the default OUI addresses. 

 

An OUI address is a globally unique identifier assigned to a vendor by IEEE. You can determine which 

vendor a device belongs to according to the OUI address which forms the first 24 bits of a MAC address. 

Switch 5500-EI series Ethernet switches support OUI address mask configuration. You can adjust the 

matching depth of MAC address by setting different OUI address masks. 

 

The following table lists the five default OUI addresses on Switch 5500-EI series switches. 

Table 1-1 Default OUI addresses pre-defined on the switch 

1 0003-6b00-0000 Cisco 

phones 

2 

000f-e200-0000 

H3C Aolynk phones 

3 00d0-1e00-0000 Pingtel 

phones 

4 00e0-7500-0000 Polycom 

phones 

5 00e0-bb00-0000 3Com 

phones 

 

In order to improve the transmission quality of voice traffic, the switch by default re-marks the 

precedence of the traffic in the voice VLAN as follows:  

z 

Set the CoS (802.1p) precedence to 6.