RAD Data comm IPmux-11 - Manual (Page 29)

Installation and Operation Manual Chapter 1 Introduction
IPmux-11 Ver. 2.00 Functional Description 1-15
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.
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
Note
Note