Was wondering if someone can help with a problem. I have a customer at a remote location that connects via DSL and they connect to corporate network over an ipsec tunnel. I don't support the line or the cisco router, (only the tunnel) - but would like to help them stablise the DSL connection.
I noticed that the attenuation and noise margins were bad, as well as seeing the dsl flapping quite a bit so I referred the customer to thier provider. THe DSL link sappears to be a good distance away from their local exchange so provider enabled interleaving. It seems to have made some difference. Noise margin is now average (although attenuation is the same) -
output from the sh dsl interface atm0 command
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' 'TSTC'
Vendor Specific: 0x0000 0x0000
Vendor Country: 0x00 0xB5
Capacity Used: 91% 100%
Noise Margin: 8.5 dB 6.0 dB
Output Power: 16.5 dBm 12.0 dBm
Attenuation: 64.5 dB 31.5 dB
Defect Status: None None
Last Fail Code: Handshake or init message invalid or had bad CRC
Selftest Result: 0x00
Interrupts: 6432 (0 spurious)
PHY Access Err: 0
Init FW: embedded
Operation FW: embedded
SW Version: 3.8131
FW Version: 0x1A04
Interleave Fast Interleave Fast
Speed (kbps): 160 0 416 0
Reed-Solomon EC: 28752 0 4047 10
CRC Errors: 798 0 1189 11
Header Errors: 268 0 853 6
Bit Errors: 0 0
BER Valid sec: 0 0
BER Invalid sec: 0 0
Question is do I need to manually configure the clock rate on the ATM0 interface with interleaving on? Also IP CEF is not enabled - will it be of any benefit having it on?
Also the highlight speeds above - are they operational speeds? Why is one 160kbps and the other 416kbps? The link is a slow DSL link - its in a remote location with poor broadband coverage.
>> Also the highlight speeds above - are they operational speeds? Why is one 160kbps and the other 416kbps?
Yes, they are the operational speeds that are negotiated between the ATU-R (the modem) and the ATU-C in the central office.
The two devices attempt to achieve a decent noise margin, so they step down the speed by putting less bits per subcarrier (tone of DMT they are rougly 250 some are used for upstream and other for downstream). Each direction is negotiated indipendently.
The process is dynamic so they can move to better speeds over time if noise conditions change.
>> The link is a slow DSL link - its in a remote location with poor broadband coverage.
This is true.
On the router please enable IP CEF on the interface at globally on the router .
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