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5
SSxDSL-5M
1 IDSL Module
1.1 Test Set LEDs
SSMTT-ACM, -ACM+, -EX
SSMTT-B, -C
Figure 1 Test Set LED Panels
The following test set LEDs shown in Figure 1 are used. Note if
an LED is blinking, press HISTORY to clear.
MODULE
• Green: Test set is in module mode.
SIGNAL
• Green: The test set is receiving valid signal at the proper inter-
face. For example, if the test set is configured for U interface
testing, this is green to indicate it is receiving a signal at the
U interface.
• Red: It is red when the test set is not receiving a signal.
LP 1 SYNC
• Green: Layer 1 frame synchronization is established. For ISDN
testing it blinks green when Layer 1 frame sync is established,
but the SPIDs have not yet been initialized. It is solid green
once the SPIDs have been accepted.
• Red: No frame synchronization has been established.
FRAME
• Green: the test set is receiving a valid signal and has acquired
frame synchronization on the external clock signal.
• Red: The test set is not detecting the external clock signal at
the interface. See External Clock Signal.
ERRORS
• Red: The test set is currently detecting an error. For S/T In-
terface testing, this could be a Frame error. For U interface
testing, this could be NEBE or FEBE errors.
• Blinking Red: The test set has previously detected an error,
but that error is no longer present.
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