Atm - Avaya Media Processing Server 1000 Hardware Installation And Maintenance

Operation and Administration
Failure of any TSS interrupts the audio paths used in bridging. A number of hardware devices are
involved in completing an audio path for intra-chassis bridging. Failure of any of these devices
interrupts the transmission of audio from or to each TMS.
The following is a list of possible faults:
• All Audio paths are affected due to a NIC TSS failure.
• All audio to and from a single TMS slot are affected.
• Intermittent errors occur in bridging that results in a loss of audio.
The second and third faults can be caused by several factors:
• fault on NIC TSS affecting one or more audio streams
• fault on TMS affecting one or more audio streams
• fault on backplane or connector with an open or short on one or more audio streams
• fault on NIC mid plane or connector with an open or short on one or more audio streams
Troubleshooting
1. Transfer control from the primary NIC to the secondary NIC to isolate if the problem exists on
the NIC.
2. If the problem is not isolated to a single NIC, run the bridging field factory test to isolate the
problem to either the NIC, the TMS, or the backplane.

ATM

Inter-chassis bridging on the TMS is supported on an MVIP highways within the chassis and ATM
fiber connections between chassis. MVIP highways are a set of TDM streams that connect each
TMS to the NIC. Each TMS backplane slot has 256 full duplex channels or connections to the NIC.
These 256 nonblocking channels are divided to 8 half-duplex streams that support 64 TDM
channels per stream. The same MVIP backbone is used for both intra-chassis bridging as well as
inter-chassis ATM bridging.
The TMS and NIC use a TSS to connect to the audio path. Each TMS has 256 nonblocking
channels or MVIP highways while the NIC has 1024. The backplane has 8 unique lands dedicated
to each TMS slot which are connected to each NIC slot, 64 unique lands at the NIC.
The ATM interface provides 1024 full-duplex nonblocking channels for each chassis. You can view
these channels as a set of virtual TDM highways. Typically, the ATM fiber from each NIC connects
to a unique port on an ATM switch. The NIC fills in the routing information in the ATM packet based
on physical location, chassis and backplane slot. The header in each ATM packet is decoded by the
ATM switch, which routes the packet from source to destination. The ATM switch is programmed to
route all packets with a unique header; therefore, each chassis and NIC has a dedicated port on the
switch.
When bridging two calls within the chassis, the NIC allocates a pair of MVIP highways and ATM
channels for each TMS, and then makes the correct connections on its TSS. The TMS local TDM
Avaya Media Processing Server 1000 Hardware Installation and Maintenance
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Comments? infodev@avaya.com
October 2014