[c-nsp] DS3 problem on PA-T3

Wed Oct 1 11:56:26 EDT 2008

It looks like Opti-3 have "Long" and "Short" option for LBO on the DS3
interface.  I am going to make sure Verizon set it to short since the coax
is only about 15' long.

I don't have any attenuators handy to try that out.  I did however, changed
the DSU mode to Kentrox and errors have gone away for the last hour.  I
didn't think that really mattered if you were doing full DS3.

On Wed, Oct 1, 2008 at 10:31 AM, Robert Boyle <robert at tellurian.com> wrote:

> 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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