IPmux-1/1E Installation and Operation Manual Chapter 1 Introduction
Functional Description 1-19
802.1D Tag Protocol Type
81 00
user_priority
CFI = 0
VID
8654 18 1
Priority VLAN ID
Figure 1-17. VLAN Tag Format (802.1p&q)
UDP Support
Table 1-3. UDP Ports Definition
Field Length (Bits) Field Description Value Function
2 bytes UDP Source Port 2–497d* Destination timeslots bundle
2 bytes UDP Destination Port 2142d Standard TDMoIP UDP port
* The MSB of this field can be either 1 or 0 for inband end-to-end proprietary signaling.
The UDP Source Port field is used for destination timeslots bundle indication.
For example, if the destination is:
Bundle 1 – 02, Bundle 2 – 03, Bundle 3 – 04, Bundle 4 – 05, etc.
For more information about VLAN tagging, refer to IEEE Std 802.1p&q.
Packet Delay Variation Packets are transmitted at set intervals. Packet Delay Variation is the maximum
deviation from the nominal time the packets are expected to arrive at the far end
device. IPmux-1 has a buffer that compensates for the deviation from the expected
packet arrival time to prevent IPmux-1 buffers from emptying out or overflowing.
Packet Delay Variation is an important network parameter. Large PDV (exceeding
the jitter buffer configuration) will cause receive buffer underflows and errors at
the E1/T1 level (see Figure 1-18).
To compensate for large PDV, configure the PDVT (jitter) buffer to a higher value.
Note
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