Cisco Systems IPMUX-1E OAM Connectivity, End-to-End Alarm Generation, Duplicated Frames

Chapter 1 Introduction IPmux-1/1EInstallation and Operation Manual

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: jitterbuffersize[msec[

framedelay[msec]

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.

Note For control packets, the UDP check sum is not calculated nor checked.

End-to-End Alarm Generation

An end-to-end alarm generation mechanism exists in IPmux-1 to facilitate the following alarms:

Unframed	AIS is transmitted toward 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.

1-24 Functional Description