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at a time until the Telnet session gives a normal response time. The last port that
you disabled should be the one through which the congesting calls were coming.
2. If you can be in front on the ONcore hub/CELLplex 4000, log on to the console,
make sure that the trace is not active, then if the ATM switch is an ONcore, look at
the traffic LEDs and disable the for which the traffic LED is constantly lit. If your
ATM switch is a CELLplex 4000, disable the high-bandwidth port.
When there is congestion, it is often due to the failure of a major ATM component (ARP
server, LAN emulation server, switch down, public network down, file server down). You
have to determine which of these ATM components failed.
Problems of ATM connections/performance through a WAN (VP tunnel).
Steps to Take:
1. Check the Switch configurations at both sides:
check that the VPI corresponds to the VPI provided by your network provider.
check that the bandwidth is lower or equal to the Maximum Peak Rate
negotiated with your network provider.
The actual bandwidth used by your media modules is the maximum one (155 Mbps
for a 6402M module, 100 Mbps for a 6404M-100 module etc.), even if a lower value
is specified with the SET_LOGICAL_LINK command.
check that one NNI port on one side is defined as 'network-side' and that the
NNI port on the other side is defined as 'user-side'.
if you are using single mode 6402M modules, you probably have to define the
clocking as external, using the SET PORT command (the clock is usually
provided by the WAN). In addition, if you have a CELLplex 4000 or an ONcore
hub with a microcode version greater than 2.0, you have to specify the type of
network (SONET or SDH) at the end of the SET PORT command.
2. If the previous steps did not help, then you require an ATM Analyzer for the
following tests:
Hardware wrap test through the WAN up to the media module, install the ATM
Analyzer at one side of the WAN, and the ONcore hub/CELLplex 4000 at the
other. Disable your NNI port, and enter the command WRAP slot.port
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