NEC UNIVERGE SV9100 Manual page 15

Part 1: VoIP Reference Manual 15
VID - VLAN ID is the identification of the VLAN, which is basically used by the standard 802.1Q. It
allows the identification of 4096 VLANs.
Length/Type - This field indicates either the number of MAC-client data bytes that are contained in
the data field of the frame, or the frame type ID if the frame is assembled using an optional format .
Data - Is a sequence of bytes of any value. The total frame minimum is 64bytes.
Frame check sequence (FCS) - This sequence contains a 32-bit cyclic redundancy check (CRC)
value, which is created by the sending MAC and is recalculated by the receiving MAC to check for
damaged frames.
Example Ethernet Frame with Layer 2 QoS enabled
The example below shows an Ethernet Frame containing one RTP (speech) packet. The Frame has
been VLAN tagged, has a VLAN ID of 99 and a VLAN Priority of 5. It is also possible to see that the
Layer 3 QoS has not been set.