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Hub and T1

Posted on 2006-07-10
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Last Modified: 2012-05-05
Is there anyway to connect a T1 circuit into a hub (or whatever) and then into a Cisco CSU/DSU? I need to be able to see packets coming out of the T1 circuit and going into the csu/dsu.
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Question by:DoobyWho
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Scotty_cisco earned 250 total points
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No there is no way to do this .... you need a test set to do what you are thinking .... if you have a cisco CSU/DSU you should be able to trouble shoot this fairly well.

Thanks
Scott
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by:DoobyWho
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That's what I though. How would I do it with a CSU/DSU? From what I am looking at there isn't a way to do it with the csu/dsu.
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by:Scotty_cisco
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what type of circuit is plugged into the CSU?  and do you see errors CRC Frame ect?

Thanks
scott
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by:DoobyWho
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T1 circuit. No errors.
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by:Scotty_cisco
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what type of T1 point to point or frame?  and what is on the other end?

Thanks
Scott
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by:DoobyWho
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it's going into a PRN cloud. Encapsulation is HDLC.
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by:Scotty_cisco
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so when you do a show int s0/0 or whatever what do you see or get?

Thanks
Scott
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by:DoobyWho
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Hardware is GT96K with integrated T1 CSU/DSU
Internet address is xxxx
MTU 1500 bytes, BW 1500 Kbit, DLY 20000 usec,
   reliability 255/255, txload 50/255, rxload 5/255
Encapsulation HDLC, loopback not set
Keepalive set (10 sec)
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters 1w5d
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 8
Queueing strategy: priority-list 1
Output queue (queue priority: size/max/drops):
   high: 0/20/0, medium: 0/40/0, normal: 0/60/8, low: 0/80/0
5 minute input rate 35000 bits/sec, 22 packets/sec
5 minute output rate 295000 bits/sec, 31 packets/sec
   6337012 packets input, 3326616677 bytes, 0 no buffer
   Received 295853 broadcasts, 0 runts, 0 giants, 0 throttles
   0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
   6515449 packets output, 3648942045 bytes, 0 underruns
   0 output errors, 0 collisions, 0 interface resets
   0 output buffer failures, 0 output buffers swapped out
   0 carrier transitions
   DCD=up  DSR=up  DTR=up  RTS=up  CTS=up
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by:Scotty_cisco
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maybe I am missing something here so lets take a step back you are recieving packets on the serial .... what are you trying to do or determine?

5 minute input rate 35000 bits/sec, 22 packets/sec
5 minute output rate 295000 bits/sec, 31 packets/sec

are you trying to determine type of traffic???

Thanks
scott
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by:DoobyWho
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no . We have an application that uses FTP to transfer data. at two of our locations the FTP traffic stops as soon as it starts sending 167 byte packets. According to a packet sniffer, the server site is sending the packets and when sniffing at the client location, that location is never receiving them. So i wanted to check to see if the packets are even getting out of the router and onto the T1.
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by:Scotty_cisco
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clear counters and start your ftp when it supposedly stops sending look at the counters are they still incementing if so your data is still hitting the T1.

Thanks
Scott
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by:scrathcyboy
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CSU/DSU traffic is encrypted between the receiving CSU/DSU and the other provider end, if you were to intercept this traffic, it would be unintelligible to you or a router.  HOWEVER !!  YOur T1 provider has the diagnostics on their system to see exactly what is getting to your CSU/DSU -- so I recommend you call them in the morning and help you debug this problem, they have the equipment to debug it better than anyone else.
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by:DoobyWho
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The provider cannot see the info either since it's a PRN network.
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by:scrathcyboy
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