{"id":210,"date":"2010-06-01T20:21:21","date_gmt":"2010-06-01T20:21:21","guid":{"rendered":"http:\/\/wiki.freeiz.com\/?p=210"},"modified":"2016-08-09T12:00:51","modified_gmt":"2016-08-09T12:00:51","slug":"cisco-dsl-mode-tweaks","status":"publish","type":"post","link":"https:\/\/wiki-see.info\/wp\/2010\/06\/01\/cisco-dsl-mode-tweaks\/","title":{"rendered":"Cisco DSL Mode Tweaks"},"content":{"rendered":"

1. dsl operating-mode auto<\/span><\/strong><\/p>\n

To configure the (DSL) operating mode, use the :<\/span><\/p>\n

<\/strong>Interface Atm0
\ndsl operating-mode itu-dmt<\/span><\/p>\n

dsl operating-mode {adsl2 [annex a | annex m] | adsl2+ [annex a |<\/strong> annex m] |
\nansi-dmt | auto | itu-dmt} <\/strong><\/span><\/p>\n

<\/strong>The router continues switching between modes, in sequence, until the router reaches the state
\nshowtime (which signifies that the connection attempt was successful) and connects using one of the modes.<\/span><\/p>\n

This switching process is designed specifically for expediting DSL performance<\/strong>.<\/span><\/p>\n

2. dsl sync mode<\/span><\/strong><\/p>\n

To set a preference for Digital Subscriber Line (DSL) synchronization mode, use the :<\/span><\/p>\n

interface atm0
\ndsl sync mode <\/strong> itu-dmt<\/span><\/p>\n

3. dsl sync interval<\/span><\/strong><\/p>\n

<\/strong>To set the interval of time between ANSI synchronization and ITU synchronization, use the: <\/strong>interface atm0
\ndsl sync interval seconds<\/em>By default, the DSL synchronization interval is 2 seconds.<\/span><\/p>\n

Number of seconds between ITU and ANSI synchronization.
\nThis number must be within the range from 2 to 360 seconds.<\/span><\/strong> <\/strong><\/p>\n

4. dsl lom<\/span><\/strong><\/p>\n

(lom = Loss Of Margin)<\/span><\/p>\n

\ufeff dsl lom <\/strong>number\u00a0 (1-250)<\/span><\/p>\n

Enables LoM monitoring and checks for the specified number of consecutive LoM messages.
\nWhen message count exceeds configured size it will cause the router\u00a0 adsl line to resync with the dslam.
\n
\n5. dsl noise-margin <\/strong><\/span><\/p>\n

Amount by which a <\/strong>signal exceeds the minimum amount for proper operation. If dsl noise margin
\nreaches this peak it will cause the adsl line to resync.<\/span><\/p>\n

interface atm0
\ndsl noise-margin -3<\/span><\/p>\n

6dB or below<\/strong> is bad and will experience no sync or intermittent sync problems
\n7dB-10dB<\/strong> is fair but does not leave much room for variances in conditions
\n11dB-20dB<\/strong> is good with no sync problems
\n20dB-28dB<\/strong> is excellent
\n29dB or above<\/strong> is outstanding<\/span><\/p>\n

6. dsl max-tone-bits <\/span><\/strong><\/p>\n

\ufeff<\/strong>Sets the maximum bits per tone limit.
\nInteger ranges from 2 dB to 14 dB with a granularity of 1\u00a0dB.<\/span><\/p>\n

interface atm0
\ndsl max-tone-bits 10<\/span><\/p>\n

7. dsl power-cutback<\/span><\/strong><\/p>\n

maximum noise margin that can occur on a digital subscriber line (DSL) before a power cutback happens.
\ndefault value of 31
\nMaximum noise margin in decibels. Range is 1 to 30.<\/span><\/p>\n

interface atm0
\ndsl power-cutback 1<\/span><\/p>\n

8<\/span>. dsl bitswap<\/strong> both<\/strong><\/span><\/p>\n

is for G.DMT – it’s good for the connection in terms of stability. Should be left on, and if I’m not
\nmistaken I think it’s for adapting to changes on a line\u00a0(swapping bit allocations).<\/span><\/p>\n

Bitswapping<\/strong>: adapts to errors on the line:<\/span><\/p>\n

As line conditions change, bit swapping allows the modem to swap bits around different channels,
\nwithout retraining, as each channel becomes more or less capable. If bit swapping is disabled then this
\ndoes not happen and the modem needs to retrain in order to adapt to changing line conditions.<\/span><\/p>\n

Complete Configuration :<\/span>
\n<\/strong>
\n Eg :<\/span>
\n<\/strong>interface atm0
\ndsl operating-mode itu-dmt
\ndsl sync mode itu-dmt
\ndsl sync interval 30
\ndsl lom 200
\ndsl noise-margin -3
\ndsl max-tone-bits 10
\ndsl power-cutback 1
\ndsl bitswap bot<\/span>h<\/p>\n

On routers that don’t have the below firmware:<\/strong><\/span><\/p>\n

Init FW:\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 init_AMR-4.0.015.bin
\nOperation FW:\u00a0\u00a0\u00a0 AMR-4.0.015.bin
\nFW Source:\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 external
\nFW Version:\u00a0\u00a0\u00a0\u00a0\u00a0 4.0.15<\/span><\/p>\n

Issue the command :<\/span>
\nservice internal<\/span><\/strong><\/p>\n

A Tip<\/span><\/span><\/strong><\/p>\n

Remember previously how you had to issue the command \u201cservice internal\u201d to configure noise margin
\nsettings\u2026well that is no longer the case with this new firmware! Now it is by default in the atm0 interface
\nmode, and theres a few other settings you can adjust as well..<\/span><\/p>\n

cisco877(config-if)#dsl ?<\/span>
\n bitswap\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Bitswap Feature
\nenable-training-log\u00a0 enable the fw training log for Showtime and failure\u00a0 cases
\ngain-setting\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ADSL programmable gain setting
\nlom \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Loss Of Margin watch counter for line retrain
\nmax-tone-bits \u00a0 \u00a0 \u00a0set maximum bits per tone limit
\nnoise-margin\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 set noise margin offset
\noperating-mode\u00a0\u00a0 auto or specific ADSL mode
\npower-cutback\u00a0\u00a0\u00a0\u00a0 Noise Threshold for Power CutBack
\nsync \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0ADSL sync preferences<\/span><\/p>\n

Cisco FTP Download of DSL Firmware: adsl_alc_firmware.4-10-9.bin<\/span><\/p>\n

<\/p>\n

\n

ftp:\/\/ftp.cisco.com\/pub\/access\/800\/adsl_alc_20190.bin<\/a><\/p>\n

rename firmware to :<\/strong><\/span><\/p>\n

adsl_alc_20190.bin<\/span><\/p>\n

Upload to flash via tftp
\nReboot router
\nrun command: show dsl int atm0<\/span><\/p>\n

Should see:<\/span><\/p>\n

Init FW:\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 init_AMR-4.0.015.bin
\nOperation FW:\u00a0\u00a0\u00a0 AMR-4.0.015.bin
\nFW Source:\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 external
\nFW Version:\u00a0\u00a0\u00a0\u00a0\u00a0 4.0.15<\/span><\/strong><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

1. dsl operating-mode auto To configure the (DSL) operating mode, use the : Interface Atm0 dsl operating-mode itu-dmt dsl operating-mode {adsl2 [annex a | annex m] | adsl2+ [annex a | annex m] | ansi-dmt | auto | itu-dmt} The router continues switching between modes, in sequence, until the router reaches the state showtime (which […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[55,160,253],"class_list":["post-210","post","type-post","status-publish","format-standard","hentry","category-cisco-routers","tag-adsl","tag-cisco-adsl","tag-dsl"],"_links":{"self":[{"href":"https:\/\/wiki-see.info\/wp\/wp-json\/wp\/v2\/posts\/210","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wiki-see.info\/wp\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wiki-see.info\/wp\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wiki-see.info\/wp\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wiki-see.info\/wp\/wp-json\/wp\/v2\/comments?post=210"}],"version-history":[{"count":1,"href":"https:\/\/wiki-see.info\/wp\/wp-json\/wp\/v2\/posts\/210\/revisions"}],"predecessor-version":[{"id":4671,"href":"https:\/\/wiki-see.info\/wp\/wp-json\/wp\/v2\/posts\/210\/revisions\/4671"}],"wp:attachment":[{"href":"https:\/\/wiki-see.info\/wp\/wp-json\/wp\/v2\/media?parent=210"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wiki-see.info\/wp\/wp-json\/wp\/v2\/categories?post=210"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wiki-see.info\/wp\/wp-json\/wp\/v2\/tags?post=210"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}