
Chapter 10. Statistics
Red Alarm
If ALARM is displayed, a loss of frame synchronization occurred one or more times during the given interval (applies to PRI DBU card only).
Yellow Alarm
If ALARM is displayed, the telco end of the T1 was out of frame sync one or more times during the given interval (applies to PRI DBU card only).
PLL Alarm
ALARM displayed in this field usually signifies that both ends of the T1 circuit are set to provide timing (applies to PRI DBU card only).
Path Code
Number of path code violations. Path code violations include frame bit errors for D4 framing and superframes with CRC errors for ESF framing (applies to PRI DBU card only).
Line Code
Number of line code violations. Line code violations include BPVs that are not part of B8ZS code or excess zero violations (applies to PRI DBU card only).
Length Error
Number of frames received with fewer than 5 octets or greater than 4500 octets. This link violation is also reflected in the DISCARD FRAME field.
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