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DSL: ATM intfc CRC errors only, no "input errors"

I've seen this one in two recent situations:

DSL access router (this situation: 2691 w/ WIC-1ADSL, the other: 827-4V), on the end of a high-speed DSL ckt (~6Mb/s down, 400-600Kb/s up), ATM interface shows CRC errors only - no input errors (I always thought 'input errors' was supposed to include all types). They accumulate at a relatively constant rate somewhere around 15-20 per minute, and do seem to make connectivity bursty.

#show int atm 0/0

ATM0/0 is up, line protocol is up

Hardware is DSLSAR (with Alcatel ADSL Module)

Description: DSL to Cybercon

MTU 4470 bytes, sub MTU 4470, BW 6000 Kbit, DLY 3360 usec,

reliability 255/255, txload 1/255, rxload 68/255

Encapsulation ATM, loopback not set

Encapsulation(s): AAL5 AAL2, PVC mode

23 maximum active VCs, 256 VCs per VP, 1 current VCCs

VC Auto Creation Disabled.

VC idle disconnect time: 300 seconds

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

Last clearing of "show interface" counters 00:04:56

Input queue: 0/224/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: Per VC Queueing

30 second input rate 1616000 bits/sec, 237 packets/sec

30 second output rate 0 bits/sec, 0 packets/sec

56665 packets input, 49892364 bytes, 0 no buffer

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

0 input errors, 83 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

302 packets output, 50121 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 output buffer failures, 0 output buffers swapped out

#sh dsl int atm 0/0

Alcatel 20150 chipset information

ATU-R (DS) ATU-C (US)

Modem Status: Showtime (DMTDSL_SHOWTIME)

DSL Mode: ITU G.992.1 (G.DMT)

ITU STD NUM: 0x01 0x1

Vendor ID: 'ALCB' ' '

Vendor Specific: 0x0000 0x0000

Vendor Country: 0x00 0xFF

Capacity Used: 71% 69%

Noise Margin: 13.0 dB 16.0 dB

Output Power: 16.0 dBm 12.0 dBm

Attenuation: 17.5 dB 8.0 dB

Defect Status: None None

Last Fail Code: None

Selftest Result: 0x00

Subfunction: 0x15

Interrupts: 1338 (0 spurious)

PHY Access Err: 0

Activations: 1

Init FW: embedded

Operation FW: embedded

SW Version: 3.8131

FW Version: 0x1A04

Interleave Fast Interleave Fast

Speed (kbps): 0 6016 0 608

Reed-Solomon EC: 0 0 0 0

CRC Errors: 0 0 0 2

Header Errors: 0 0 0 2

Bit Errors: 0 0

BER Valid sec: 0 0

BER Invalid sec: 0 0

DMT Bits Per Bin

00: 0 0 0 0 0 0 0 4 4 5 7 8 8 9 9 9

10: A A 9 9 9 9 8 8 8 8 7 6 6 6 0 0

20: 0 0 0 0 0 0 2 3 4 4 5 5 6 6 7 7

30: 8 8 8 8 9 9 9 9 9 9 9 9 A A A A

40: A A A A A A A A A A A A A 9 9 9

50: 9 9 9 9 9 9 9 9 9 2 9 9 9 9 9 9

60: 9 8 8 8 9 9 9 9 9 9 9 9 9 9 9 9

70: 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9

80: 9 9 9 9 9 9 8 9 9 9 8 9 8 9 9 8

90: 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8

A0: 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8

B0: 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 7

C0: 7 7 7 7 7 7 7 7 7 7 7 7 6 6 5 5

D0: 5 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6

E0: 5 6 6 6 6 5 6 6 6 6 6 6 6 6 6 5

F0: 5 5 5 5 4 4 2 2 0 0 0 0 0 0 0 0

DSL: Training log buffer capability is not enabled

IOS image: c2691-is-mz.123-3.bin

The 827-4V is running c820-y6-mz.122-4.XM4.bin

Any ideas appreciated. Both of these are connected to the same DSL ISP, fwiw.

Thanks!

Mike

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