Соединение сетей при помощи VDSL-модемов :: В помощь системному администратору

Всем доброго времени суток. Имется связка 841С/841, работавшая более-менее стабильно. Перед Новым годом начали пропадать пинги. В результате имеем debug-listing:

ZyXEL(R) Prestige 841C VDSL-LT Modem Version V.1.00(DH.4) | 07/25/2005 16:56:20

Copyright (c) ZyXEL Communications Corp 2001-2005. All rights reserved.

CPU Type: T89C51RD2
VDSL Modem Code Version: 0x56
VDSL Mode: 10BaseS(0)
Reset VDSL Chip...
2:Loading VDSL modem code to LT...................................
Password: 14: Write PHY Info
14:State 0 - Initialize and setup default rate
14: Change VDSL Rate Adaptation Stage to 1
14: Write default parameters to LT
14: Goto State 1
15:State 1 - Wait for default rate connection and upgrade remote VDSL modem
16: Default rate connected (1206 ms)
16: US 1.56Mbps SNR 34.08dB MSE 31.08dB DS 4.17Mbps SNR 40.06dB MSE 30.06dB
16: Change Link Watchdog Timer
18: Remote VDSL Product Name:Prestige 841
18: NT EEPROM exists
18: NT modem code signature 0x55 0x56 0x32, upgrade is not needed
19: Goto State 2
19:State 2 - Setup target rate
19: Try to connect VDSL rate (US:1,DS:1)
19: Write parameters to NT
28: Write parameters to LT
29: Goto State 3
30:State 3 - Wait to connect target rate
30: VDSL connected (1195 ms)
30: US 6.25Mbps SNR 28.06dB MSE 25.06dB DS 6.25Mbps SNR 39.88dB MSE 33.08dB
30: Change VDSL Rate Adaptation Stage to 2
30: Goto State 2
30:State 2 - Setup target rate
30: Try to connect VDSL rate (US:0,DS:0)
30: Write parameters to NT
Write NT register 0x8c14 with value 0xb7 failure (read = 0xf2)
Write NT register 0x8c15 with value 0x00 failure (read = 0xf2)
Write NT register 0x8c16 with value 0x78 failure (read = 0xf2)
Write NT register 0x8c17 with value 0x2d failure (read = 0xf2)

Watchdog Timer Timeout, System will Reset Now.
Return Addr in Stack:
0x55:0x1C3D
0x53:0x680B
0x51:0x7021
0x4F:0x7F5F
0x4D:0x71A4
0x4B:0xAC37
0x49:0x5B44
0x47:0x6B3E

ZyXEL(R) Prestige 841C VDSL-LT Modem Version V.1.00(DH.4) | 07/25/2005 16:56:20

Copyright (c) ZyXEL Communications Corp 2001-2005. All rights reserved.

CPU Type: T89C51RD2
VDSL Modem Code Version: 0x56
VDSL Mode: 10BaseS(0)
Reset VDSL Chip...
2:Loading VDSL modem code to LT...................................
Password: 14: Write PHY Info
14:State 0 - Initialize and setup default rate
14: Change VDSL Rate Adaptation Stage to 1
14: Write default parameters to LT
14: Goto State 1
15:State 1 - Wait for default rate connection and upgrade remote VDSL modem
16: Default rate connected (1206 ms)
16: US 1.56Mbps SNR 34.08dB MSE 31.08dB DS 4.17Mbps SNR 40.08dB MSE 30.08dB
16: Change Link Watchdog Timer
23: VDSL disconnect, go to state 1
23: Write default parameters to LT
23: Goto State 1
24:State 1 - Wait for default rate connection and upgrade remote VDSL modem
84: Connect default rate timeout (60726 ms)
84: Write default parameters to LT
85: Goto State 1
86:State 1 - Wait for default rate connection and upgrade remote VDSL modem
145: Connect default rate timeout (60727 ms)
далее - повтор последних 3-х строк

прошивка - DН4.

Может кто с таким сталкивался? Ведь судя по протоколу ( см. выше ) коннект на 0-mode ( 4.7 / 1.4 Mbps) происходит, проблема начинается при переходе на 6/6 mbps/

либо источники, где можно почитать про регистры vdsl. Заранее благодарен

P.S. : вот что выдает vdsl show после "зацикливания" 841С:
P841C>vdsl show
vdsl mode: 10BaseS(0)
vdsl Active flag: on
vdsl Max. upstream rate: 1562500 bps (0)
vdsl Max. downstream rate: 4166667 bps (0)
vdsl Curr. upstream rate: 6250000 bps (1)
vdsl Curr. downstream rate: 6250000 bps (1)
vdsl state: 1
vdsl long loop flag: off
vdsl sleep mode: off
vdsl auto flag: on
vdsl monitor flag: on
vdsl debug flag: on
vdsl auto upgrade NT EEPROM flag: on
enet monitor flag: off
LT Ethernet speed: Auto
LT Ethernet flow control: on
NT Ethernet speed: Auto
NT Ethernet flow control: on
vdsl disconnect count: 0
vdsl uptime: 0 secs
vdsl pbo mode: 0

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