Specifications

Installation and Operation Manual Chapter 1 Introduction
MPW-1 MP-4100 Ver. 2.0 Functional Description 1-25
The frame overhead and the number of TDM bytes per frame have already been
presented; the additional parameter is the number of frames per second, which
assumes the following values:
• Unframed E1 stream: 5447/N, where N is the multiplier of 48 bytes specified
when selecting the number of TDM bytes per frame
• Framed E1 stream: 8000 × k/47N, where k is the number of timeslots
assigned to the pseudowire.
Determining UDP Port Numbers Used by Pseudowires
For UDP/IP networks, the pseudowire label determines the source UDP port of a
pseudowire (at the other endpoint of the pseudowire, this port number must
then be inserted as the destination port). The method used to assign the source
UDP port is as follows (unless explicitly stated otherwise, all the numbers are in
hexadecimal notation):
• For TDMoIP CE pseudowires using packet payload Version V1:
During normal operation, the source UDP port is given by:
UDP Source Port = Pseudowire Label + 1
This means that during normal operation, the UDP ports numbers are in the
range of 0 to 8191 decimal.
While the pseudowire is in the local fail state, the source UDP port changes
to:
UDP Source Port = Pseudowire Label + 8000
This means that in the local fail state, the UDP ports numbers are higher than
8000 hexa (32768 decimal).
• For TDMoIP CE pseudowires using packet payload Version V2:
UDP Source Port = Pseudowire Label + 2000
This means that for TDMoIP CE pseudowires, all the UDP ports numbers are
higher than 2000 hexa (8192 decimal). This also applies to HDLCoPSN.
When application requirements cause the MPW-1 module to send to the same
peer (destination IP address) packets using both payload version V1 and
payload version V2, there is a potential for conflict. For example:
 When you assign a certain label (for example, Out PW Label is set to 100)
to a pseudowire using payload Version V1, the source UDP port is 101
 Now, you cannot assign the next label (Out PW Label of 101 in this
example) to a pseudowire using payload Version V2, because the resulting
source UDP port is also 101
So, it is always necessary to must skip (never use) the pseudowire label next
to the label assigned to a pseudowire using payload Version V1, if the next
pseudowire uses payload Version V2.
• For CESoPSN and SAToPSN pseudowires using packet payload Version V2:
UDP Source Port = Pseudowire Number + C000
This means that all the UDP ports numbers are higher than C000 hexa (49152
decimal).