Router# show interfaces serial1 
Serial1 is up, line protocol is up 
Hardware is HD64570 
Internet address is 190.1.2.1/24 
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, 
Reliability 255/255, txload 237/255, rxload 1/255 
Encapsulation HDLC, loopback not set 
Keepalive not set 
Last input 00:00:22, output 00:00:00, output hang never 
Last clearing of "show interface" counters 00:17:58 
Input queue: 0/75/0 (size/max/drops); Total output drops: 2479 

Queueing strategy: random early detection(RED) 
flows (active/max active/max): 8/9/16 
mean queue depth: 27 
drops: class random tail min-th max-th mark-prob 
0 946 0 20 40 1/10 
1 488 0 22 40 1/10 
2 429 0 24 40 1/10 
3 341 0 26 40 1/10 
4 235 0 28 40 1/10 
5 40 0 31 40 1/10 
6 0 0 33 40 1/10 
7 0 0 35 40 1/10 
rsvp 0 0 37 40 1/10 
  30 second input rate 1000 bits/sec, 2 packets/sec 
  30 second output rate 119000 bits/sec, 126 packets/sec 
     1346 packets input, 83808 bytes, 0 no buffer 
     Received 12 broadcasts, 0 runts, 0 giants, 0 throttles 
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort 
     84543 packets output, 9977642 bytes, 0 underruns 
     0 output errors, 0 collisions, 6 interface resets 
     0 output buffer failures, 0 output buffers swapped out 
     0 carrier transitions 
     DCD=up DSR=up DTR=up RTS=up CTS=up 


what is the meaning of "dcd=up"?
thanks.



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