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As voice traffic is delay and jitter sensitive for the IP phone, it requires higher priority over data traffic to reduce delay and packet loss during transmission. To simplify configuration procedures and better manage voice transmission policies, the connected switch can be configured to provide voice VLAN function and transmit the voice traffic of the IP phone in a dedicated VLAN, called voice VLAN.
Voice VLAN is a special access port feature of the switch which allows IP phones to be automatically configured and easily associated with a logically separate VLAN. This feature provides various benefits, but one particular benefit is that when voice VLAN is enabled on a switch port, this port is also enabled to allow simultaneous access for a PC. This feature allows a PC to be daisy chained to an IP phone and the connection for both PC and IP phone to be trunked through the same physical Ethernet cable.The purpose of VLAN configurations on the IP phone is to insert tag with VLAN information to the packets generated by the IP phone. When VLAN is properly configured for the ports (Internet port and PC port) on the IP phone, the IP phone will tag all packets from these ports with the VLAN ID. The switch receives and forwards the tagged packets to the corresponding VLAN according to the VLAN ID in the tags described in IEEE Std 802.3.
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Major Benefits of Using VLANs

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TLV Name

TLV Type

Description

Mandatory TLVs

 

 

 




Chassis ID

Specifies the IP address of the sending port.

Port ID

Specifies the MAC address of the IP phone.

Time To Live

Specifies the life of the transmitted information on the IP phone. The default value is 180sec.

End of LLDPDU

Marks the end of the TLV sequence in the LLDPDU. No further processing of TLVs after this is necessary. This is a mandatory TLV and therefore must be present at the end of the data stream.

Optional TLVs

 

 

 




System Name

Specifies the administratively-assigned name for the IP phone.
The default value is "UCxxx"

System Description

Specifies the description of the IP phone.
The default value is IP Phone

System Capabilities

Specifies the supported and enabled capabilities of the IP phone.
The supported capabilities are Bridge, Router and Telephone.
The enabled capabilities are Bridge and Telephone by default.

Port Description

Specifies the description of the sending port.
The default value is "WAN PORT".

IEEE Std 802.3 Organizationally Specific TLV

MAC/PHY Configuration/Status

Specifies duplex and bit rate settings of the IP phone.
The Auto Negotiation is supported and enabled by default.
The advertised capabilities of PMD
Auto-Negotiation are:
100BASE-TX (full duplex mode)
100BASE-TX (half duplex mode)
10BASE- T (full duplex mode)
10BASE- T (half duplex mode)

LLDP -MED TLVs

 

 

 

 

 

 

 








Media Capabilities

Specifies the MED device type of the IP phone and the supported LLDP -MED TLV type can be encapsulated in LLDPDU.
The supported LLDP -MED TLV types are:

  • LLDP -MED Capabilities
  • Network Policy
  • Extended Power via MDI-PD
  • Inventory

Network Policy

Specifies the port VLAN ID, application type, L2 priority and DSCP value.

Extended Power-via-MDI

Specifies power type, source, priority and value.

Inventory – Firmware Revision

Specifies the firmware revision of IP phone.

Inventory – Serial Number

Specifies the serial number of IP phone.

Inventory – Manufacturer Name

Manufacturer name of IP phone.
The default value is "Htek".

Inventory – Model Name

Specifies the model name of IP phone.

Asset ID

Specifies the asset identifier of IP phone.
The default value is "asset".

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