I have a 10MB ATM circuit between 2 operations centers. This circuit is going down, but I am only seeing carrier transitions on one end of the link when this happens. Why am I only seeing this on one end? What does the carrier transition tell me about what is happening? Any hightly detailed and informative docs are appreciated. See the "show int" below:
ATM4/1/0 is up, line protocol is up
Hardware is cyBus ENHANCED ATM PA
Description: POC T3 Fiber (Ckt=DNEC.935038 AT&T=8002866621)
MTU 4470 bytes, sub MTU 4470, BW 44209 Kbit, DLY 190 usec,
reliability 255/255, txload 42/255, rxload 24/255
Encapsulation ATM, loopback not set
Keepalive not supported
4096 maximum active VCs, 1 current VCCs
VC idle disconnect time: 300 seconds
20 carrier transitions
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters 04:05:27
Input queue: 0/100/0/2 (size/max/drops/flushes); Total output drops: 71
Queueing strategy: fifo
Output queue :0/100 (size/max)
30 second input rate 4289000 bits/sec, 1475 packets/sec
30 second output rate 7290000 bits/sec, 1638 packets/sec
19137594 packets input, 1633863208 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
Number of times the carrier detect signal of a serial interface has changed state. For example, if data carrier detect (DCD) goes down and comes up, the carrier transition counter will increment two times. Indicates modem or line problems if the carrier detect line is changing state often.
you may want to try using an DS3 attenuator to make sure the signal comming
into the rx side of the interface is not too hot.
ATTEN-KIT-PA= is the cisco part number for the attenuator kit .
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