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Why CTS is down

Dear All,

May I know under what kind of situation the CTS will show down, the circuit is running fine currently. thank you.

SATTSA1#sh int s1/0

Serial1/0 is up, line protocol is up

Hardware is M4T

MTU 1500 bytes, BW 1536 Kbit, DLY 20000 usec,

reliability 255/255, txload 55/255, rxload 167/255

Encapsulation PPP, LCP Open, multilink Open, crc 16, loopback not set

Restart-Delay is 0 secs

Last input 00:00:00, output 00:00:00, output hang never

Last clearing of "show interface" counters 12:41:35

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: weighted fair [suspended, using FIFO]

FIFO output queue 0/40, 33 drops

30 second input rate 1008000 bits/sec, 303 packets/sec

30 second output rate 336000 bits/sec, 281 packets/sec

4326297 packets input, 1378146069 bytes, 0 no buffer

Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

3868242 packets output, 520902997 bytes, 0 underruns

0 output errors, 0 collisions, 2 interface resets

0 output buffer failures, 0 output buffers swapped out

2 carrier transitions DCD=up DSR=up DTR=up RTS=up CTS=down

Thank you,

Hall of Fame Super Gold

Re: Why CTS is down


The "modem" you're connected to incorrectly keeps CTS down, or there is a cabling problem.

However, router sees DCD up and doesn't care about CTS.

Actually, in most cases, CTS/RTS are uninfluent on point-to-point synchronous circuits.

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