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Is Annex M ADSL2+ still Frame Relay?

Posted on 2010-09-23
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Last Modified: 2012-05-10
Hi,

We were on ADSL2+ Annex A and I know this was a frame relay nework.

Our QoS engine in our router automatically measures the uplink speed and whether or not detects whether or not the network is frame relay.

Before the Annex M upgrade it detected as frame relay, after the upgrade it now states that it is not a frame relay network.

Has is detected incorrectly and should I set this setting manually, or is an Annex M connection not frame relay.

Thanks.
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Question by:benofishal
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Expert Comment

by:rowansmith
ID: 33743165
ADSL2+ ANNEX A is NOT Frame Relay and nor is Annex M.

The main difference between this specification and Annex A is that the upstream/downstream frequency split has been shifted from 138 kHz up to 276 kHz (as in Annex J), allowing upstream bandwidth to be increased from 1.4 Mbit/s to 3.3 Mbit/s, with a corresponding decrease in download bandwidth. [Ref: Wikipedia]

What you are probably seeing as Frame Relay is your Layer 2 encapsulation over the ADSL circuit.  It is possible that your provider has changed this as a result of the change to Annex M.  You could try Forcing Annex A to see if the FrameRelay flag returns.

It is more likely that you are now seeing ATM Frames over your ADSL2+ Annex M service.

-Rowan

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by:benofishal
ID: 33743400
OK thankyou I stand corrected. The option I have on the router (Dlink DIR-655) is under QoS there is a setting for network type. My options are "xDSL or Other Frame Relay Network" or "Cable or Other Broadband Network"

Which setting would you advise.

Our ISP uses Ethernet over ATM.

Thanks.
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rowansmith earned 250 total points
ID: 33743573
xDSL refers collectively to all types of Digital Subscriber Lines (DSL), the two main categories being ADSL (Asynchronous) and SDSL (Synchronous). Two other types of xDSL technologies are High-data-rate DSL (HDSL) and Very high DSL (VDSL).

So you want to choose xDSL.

-Rowan
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Author Closing Comment

by:benofishal
ID: 33745057
Thanks for all your help.
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