RAD Data comm IPmux-11 OAM Connectivity, End-to-End Alarm Generation, Trail-Extended Mode

Installation and Operation Manual Chapter 1 Introduction

Note For V1 the maximum number of frames that can be reordered is 7, even if the calculation result exceeds 7. For V2 the maximum number of frames that can be reordered is 64, even if the calculation result exceeds 64.

Duplicated Frames

When frames are duplicated, IPmux-11 only uses the later frame.

OAM Connectivity

When a destination IPmux-11 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 checksum is not calculated nor checked.

End-to-End Alarm Generation

An end-to-end alarm generation mechanism exists in IPmux-11 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.

Trail-Extended Mode

To enhance fault condition reporting capabilities, remote IPmux-11 transfers RDI, LOS and AIS conditions received from the remote E1 device to the local E1 device (see Figure 1-10).

Figure 1-10. Fault Indication Transfer

IPmux-11 Ver. 2.00 Functional Description 1-15