Nortel Meridian Meridian 1 Feature Description And Administration page 1284

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Overloaded MSDL port running an SDI Application
553-2901-301 Standard 9.00 January 2002
MSDL Port Overload Counter
Cause: The Meridian 1 received an excessive number of messages (equal to
or greater than 200 messages in a two second time period) from the MSDL
port. One scenario of the overloaded SDI port is the case of a smart-modem
setup for "smart" vs. "dumb" mode. The Meridian 1 and the modem may be
bouncing the same messages back and forth until the 200 port message
threshold is reached.
To clear the fault: Manually disable the link in Overlay 37 using the command
DIS TTY xx, where xx is the SDI number. Enable the AML Link using
Overlay 37 using the command ENL TTY xx.