Nortel Networks Video Gaming Accessories 553-3001-211 Manual De Usuario

 NT5D33 and NT5D34 Lineside E1 Interface cards

condition. Depending on how the Man Machine Interface (MMI) is 
configured, this LED will remain lit until one the following actions occur:

•

If the “Self-Clearing” function is enabled in the MMI, the LED will clear 
the alarm when the alarm condition is no longer detected. This is the 
factory default configuration.

•

If the “Self-Clearing” function has not been enabled or it has been 
subsequently disabled in the MMI, the LED alarm indication will stay lit 
until the command “Clear Alarm” has been typed in the MMI, even 
though the carrier automatically returned to service when the alarm 
condition was no longer detected.

The YELLOW ALARM LED indicates that the LEI has detected a yellow 
alarm signal from the terminal equipment side of the E1 link. See 
“Man-Machine E1 maintenance interface software” on 

 for 

information on E1 link maintenance. If the terminal equipment detects a red 
alarm condition such as not receiving a signal, or the signal exceeds bit-error 
thresholds or frame-slip thresholds, a yellow alarm signal is sent to the LEI, 
if the terminal equipment supports this feature. If a yellow alarm signal is 
detected, this LED will light.

The MAINT LED indicates if LEI is fully operational because of certain 
maintenance commands that are issued through the MMI. See “Man-Machine 
E1 maintenance interface software” on 

 for information on E1 link 

maintenance. If the card detects that tests are being run or that alarms have 
been disabled through the MMI, this LED will light and will remain lit until 
these conditions are no longer detected, then it turns off.

 shows a block diagram of the major functions 

contained on the LEI card. Each of these functions is described on the 
following pages.