[c-nsp] DS3 problem on PA-T3

Wed Oct 1 10:31:51 EDT 2008

At 10:18 AM 10/1/2008, you wrote:
>I am stumped on a problem with our Telco here.

Jay,

Have you tried an attenuator on the DS3 RECV port on your PA-T3? Try 
a 10db or a 13db. The signal from the Opti-3 is usually pretty high 
and overdrives the RECV circuit. Although typically when that 
happens, it is a PA-MC-T3 and you see tons of LCVs, but I have seen 
it with a PA-T3 too.

R

>We have a frame-relay DS3 from Verizon.  This is how it's connected from the
>CO.
>
>Verizon CO Frame router/switch <-> DS3 <-> Adtran Opti3 <-> OC3 fiber <->
>Adtran Opti3 <-> DS3 <-> our router
>
>We started having problem two weeks ago and the circuit started bouncing.
>We originally had a 7500 router there.  Verizon kept insisting the problem
>is CPE so we have tried second DS3 interface on the 7500, different card in
>the 7500, then finally swapping out the entire router with a 7200 and
>PA-T3.  Verizon finally figured out there was indeed something wrong on
>their side and swapped out some cards on the Opti3.  Now the circuit isn't
>going up and down but we are seeing trickling errors on the interface
>consistantly.  They put a T-berd on our side of the dmark and monitored the
>circuit over the weekend.  They are seeing errors coming from our router and
>FEBE from CO end.  From our router, I am seeing errors coming from Verizon.
>
>At this point, I can't believe it's our DS3 card.  We have changed the DS3
>cable as well.  Does anyone see any possible problem on my side of the
>config?  Or any other ideas what could be causing this problem?
>
>interface Serial1/0
>  description Verizon DS3 frame-relay
>  no ip address
>  no ip redirects
>  no ip unreachables
>  no ip proxy-arp
>  encapsulation frame-relay IETF
>  no ip mroute-cache
>  logging event subif-link-status
>  logging event dlci-status-change
>  framing c-bit
>  cablelength 50
>  dsu bandwidth 44210
>  serial restart-delay 0
>  frame-relay lmi-type ansi
>
>#sh controllers ser 1/0
>M1T-T3 pa: show controller:
>PAS unit 0, subunit 0, f/w version 3-92, rev ID 0x2800001, version 3
>idb = 0x614754AC, ds = 0x61476FC4, ssb=0x614772F4
>Clock mux=0x30, ucmd_ctrl=0x0, port_status=0x1
>Serial config=0x8, line config=0x1B0202
>maxdgram=4584, bufpool=128Kb, 256 particles
>
>    rxLOS inactive, rxLOF inactive, rxAIS inactive
>    txAIS inactive, rxRAI inactive, txRAI inactive
>line state: up
>cable type : T3  cable, received clockrate 44201430
>
>base0 registers=0x3C800000, base1 registers=0x3C802000
>rx_base0 registers=0x3C804000, rx_base1 registers=0x3C806000
>mxt_ds=0x61922350, rx ring entries=124, tx ring entries=254
>statring=0x3903900, statr shadow=0x61479124, stat_head=175
>plus_pa: rx_statring=0x3903D40, rx_statr shadow=0x61479950, rx_stat_head=29
>rxring=0x39036C0, rxr shadow=0x61478AF8, rx_head=109
>txring=0x3904300, txr shadow=0x61479D7C, tx_head=185, tx_tail=191,
>tx_count=6
>throttled=0, enabled=0
>halted=0, last halt reason=0
>Microcode fatal errors=0
>rx_no_eop_err=0, rx_no_stp_err=0, rx_no_eop_stp_err=0
>rx_no_buf=0, rx_soft_overrun_err=23, dump_err= 0, bogus=0, mxt_flags=0x2C
>tx_underrun_err=18, tx_soft_underrun_err=0, tx_limited=0(254)
>tx_fullring=538, tx_started=809952433
>rx_int_count=870161881, tx_int_count=1611065176
>    Framing is c-bit, Clock Source is Line
>    Bandwidth limit is 44210, DSU mode 0, Cable length is 50
>    rx FEBE since last clear counter 1980, since reset 179
>    Data in current interval (881 seconds elapsed):
>      1 Line Code Violations, 1 P-bit Coding Violation
>      1 C-bit Coding Violation
>      1 P-bit Err Secs, 0 P-bit Sev Err Secs
>      0 Sev Err Framing Secs, 0 Unavailable Secs
>      1 Line Errored Secs, 1 C-bit Errored Secs, 0 C-bit Sev Err Secs
>    Total Data (last 24 hours)
>      2343 Line Code Violations, 637 P-bit Coding Violation,
>      635 C-bit Coding Violation,
>      260 P-bit Err Secs, 0 P-bit Sev Err Secs,
>      0 Sev Err Framing Secs, 0 Unavailable Secs,
>      418 Line Errored Secs, 260 C-bit Errored Secs, 0 C-bit Sev Err Secs
>
>    No alarms detected.
>
>#sh int ser 1/0
>Serial1/0 is up, line protocol is up
>   Hardware is M1T-T3 pa
>   Description: Verizon DS3 frame-relay #########
>   MTU 4470 bytes, BW 44210 Kbit, DLY 200 usec,
>      reliability 255/255, txload 57/255, rxload 13/255
>   Encapsulation FRAME-RELAY IETF, crc 16, loopback not set
>   Keepalive set (10 sec)
>   Restart-Delay is 0 secs
>   LMI enq sent  41313, LMI stat recvd 41313, LMI upd recvd 0, DTE LMI up
>   LMI enq recvd 0, LMI stat sent  0, LMI upd sent  0
>   LMI DLCI 0  LMI type is ANSI Annex D  frame relay DTE
>   Broadcast queue 0/256, broadcasts sent/dropped 0/0, interface broadcasts 0
>   Last input 00:00:00, output 00:00:00, output hang never
>   Last clearing of "show interface" counters 4d18h
>   Input queue: 0/75/0/3084 (size/max/drops/flushes); Total output drops:
>4570
>   Queueing strategy: fifo
>   Output queue :0/40 (size/max)
>   5 minute input rate 2283000 bits/sec, 1030 packets/sec
>   5 minute output rate 10030000 bits/sec, 1403 packets/sec
>      209774076 packets input, 1379501582 bytes, 0 no buffer
>      Received 356689 broadcasts, 0 runts, 0 giants, 0 throttles
>               0 parity
>      4829 input errors, 4748 CRC, 0 frame, 79 overrun, 0 ignored, 2 abort
>      259718552 packets output, 3599585926 bytes, 0 underruns
>      0 output errors, 0 applique, 4294967295 interface resets
>      0 output buffer failures, 0 output buffers swapped out
>      1 carrier transitions
>    rxLOS inactive, rxLOF inactive, rxAIS inactive
>    txAIS inactive, rxRAI inactive, txRAI inactive
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