Chapter 1 Introduction IPmux-1/1E Installation and Operation Manual
1-24 Functional Description
Duplicated Frames
When frames are duplicated, IPmux-1/1E only uses the later frame.
Dynamic CAS Mode
Reordering and duplication of frames is not supported; the frames pass to the
TDM side without any modification.
CESoIP Mode
The number of frames that are reordered depends on the frame delay and the
jitter buffer size.
The number of frames that can be reordered is calculated by:
sec]m[framedelay
sec[m[ersizejitterbuff
OAM Connectivity When a destination IPmux is lost, the traffic load that is transmitted to that IPmux
is significantly decreased (several packets per second per connection). The IPmux
starts transmitting at full rate only when it detects an IPmux at the remote side.
OAM Connectivity is used to detect a valid connection (the remote IPmux will
confirm it recognizes the connection and that it is enabled). It prevents flooding by
a handshake.
The control packets are run over a unique bundle number that is used for this
purpose. The control packets have the same VLAN ID and TOS of the originating
connection. The control packet uses the TDMoIP UDP number.
OAM Connectivity can be set to Disable/Enable.
For control packets, the UDP check sum is not calculated nor checked.
An end-to-end alarm generation mechanism exists in IPmux-1 to facilitate the
following alarms:
Unframed AIS is transmitted to ward the near-end PBX in event of:
• Far-end LOS, AIS
• PDVT underflow/overflow.
Framed Timeslot/CAS configurable alarm pattern is transmitted toward the
near-end PBX in event of:
• Far-end LOS, LOF, AIS
• PDVT underflow/overflow.
Note