[c-nsp] PA-A3-T3 FEBE and LOS

Wed Jun 3 10:21:20 EDT 2009

Phil Davis wrote:
> Hello,
>
>  I have an ATM DS3 coming through a PA-A3-T3. The last few days it 
> would abruptly go down for 5-10 minutes, perhaps every 12 hours on 
> average. During these times, the interface would show rapidly growing 
> carrier signal loss (about 10-20/sec.) I also saw incrementing FEBE 
> errors. However, neither the provider, nor a third-party transport 
> provider was detecting LOS on the line...<>

Just wanted to add to this. Overnight we saw the same issue with the 
replacement card, so I don't think it's our equipment. I now have some 
statistics that show the carrier transition/febe errors. I'm at a loss 
to fully interpret the sh controllers atm command. What is the first 
column on PLPC errors? Would appreciate any help I could get on this. 
Thanks!

Phil

sh int ATM1/0:
ATM1/0 is up, line protocol is up
  Hardware is ENHANCED ATM PA
  MTU 4470 bytes, sub MTU 4470, BW 40704 Kbit, DLY 190 usec,
     reliability 255/255, txload 204/255, rxload 29/255
  Encapsulation ATM, loopback not set
  Encapsulation(s): AAL5
  4095 maximum active VCs, 32 current VCCs
  VC Auto Creation Disabled.
  VC idle disconnect time: 300 seconds
  74 carrier transitions
  Last input 00:00:00, output 00:00:00, output hang never
  Last clearing of "show interface" counters 22:12:59
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 4673
  Queueing strategy: Per VC Queueing
  5 minute input rate 4695000 bits/sec, 2630 packets/sec
  5 minute output rate 32647000 bits/sec, 3750 packets/sec
     132076194 packets input, 900144269 bytes, 0 no buffer
     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
     38 input errors, 38 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     174968028 packets output, 1377286139 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 output buffer failures, 0 output buffers swapped out

I do see some CRC errors now, which did not see previously. That may be 
from insertion.

sh controller atm 1/0:
Interface ATM1/0 is up
Hardware is ENHANCED ATM PA - DS3 (45000Kbps)
Framer is PMC PM7345 S/UNI-PDH, SAR is LSI ATMIZER II
Firmware rev: G153, Framer rev: 1, ATMIZER II rev: 3
  idb=0x63A1F0D4, ds=0x63A491E0, vc=0x63A572E0
  slot 1, unit 1, subunit 0, fci_type 0x005B, ticks 79887
  1200 rx buffers: size=512, encap=64, trailer=28, magic=4
Curr Stats:
  VCC count: current=32, peak=32
  AAL2 VCC count: 0
  AAL2 TX no buffer count: 0
  AAL2 RX no buffer count: 0
  SAR crashes: Rx SAR=0, Tx SAR=0
  rx_cell_lost=0, rx_no_buffer=0, rx_crc_10=0, rx_no_mem=0
  rx_cell_len=0, rx_no_vcd=34410, rx_cell_throttle=0, tx_aci_err=0
Rx Free Ring status:
  base=0x3CA7C040, size=2048, write=400
Rx Compl Ring status:
  base=0x7E4DB7E0, size=2048, read=1662
Tx Ring status:
  base=0x3CF13A40, size=8192, write=312
Tx Compl Ring status:
  base=0x0E1B3840, size=4096, read=156
BFD Cache status:
  base=0x65F45940, size=6144, read=6143
Rx Cache status:
  base=0x64458360, size=16, write=14
Tx Shadow status:
  base=0x66691E60, size=8192, read=303, write=312
Control data:
  rx_max_spins=42, max_tx_count=144, tx_count=9
  rx_threshold=800, rx_count=14, tx_threshold=4608
  tx bfd write indx=0x10DF, rx_pool_info=0x63A208C0
Control data base address:
       rx_buf_base = 0x0E3A6C80        rx_p_base = 0x66802E80
            rx_pak = 0x639727DC              cmd = 0x64752080
            framer = 0x60479798        framer_cb = 0x6474FB80
       framer_base = 0x3C900000     pci_pa_stats = 0x7E391900
    device_base[0] = 0x3C800000   device_base[1] = 0x3CC00000
     ssram_base[0] = 0x3CA00000    ssram_base[1] = 0x3CE00000
     sdram_base[0] = 0x3CB00000    sdram_base[1] = 0x3CF00000
     pa_cmd_buf[0] = 0x3CA7FC00    pa_cmd_buf[1] = 0x3CE7FC00
       vcd_base[0] = 0x3CA00000      vcd_base[1] = 0x3CE18000
      chip_dump[0] = 0x0E39192C     chip_dump[1] = 0x0E391A2C
   sar_buf_base[0] = 0x3CB24000  sar_buf_base[1] = 0x3CF1C000
       bfd_base[0] = 0x3CA64000      bfd_base[1] = 0x3CE00000
       acd_base[0] = 0x3CA22080      acd_base[1] = 0x3CE38240
Framer Information:
 Framing mode: DS3 C-bit PLCP
 No alarm detected
Facility statistics: current interval elapsed 687 seconds
          lcv       fbe       ezd        pe       ppe      febe      hcse
   ----------------------------------------------------------------------
21          2         0         1         1         1         0         0
25          2         0         1         0         0         0         0
33          0         0         0         0         0    865055         0
34          0         0         0         0         0   5002913         0
38          0         0         0         0         0   7526033         0
39          0         0         0         0         0   3415647         0
40          0         0         0         0         0   1498637         0
42          0         0         0         0         0    217324         0
44          0         0         0         0         0   2972255         0
68          2         0         1         0         0         0         0
78          1         0         1         1         1         0         0

PLCP Errors:
         bipe       fbe      febe
    -----------------------------
21          1         0         0
25          2         0         0
33          0         0     65655
34          0         0    272680
38          0         0   1744705
39          0         0   2043937
40          0         0    957544
42          0         0     21423
44          0         0    866414
68          1         0         0
78          1         0         0

   lcv:  Line Code Violation
   fbe:  Framing Bit Error
   ezd:  Summed Excessive Zeros
   pe:   Parity Error
   ppe:  Path Parity Error
   febe: Far-end Block Error
   hcse: Rx Cell HCS Error
   bipe: Bit Interleave Parity (B1) Error