[Asterisk-Users] OT: VoIP over bonded link

[Colin Anderson]

>Some thoughts that you might want to consider...

>The vdsl box runs at speeds "up to 15 meg". That translates into the longer
>the copper loop, the slower the speed. You'll probably want to accurately
>measure the copper loop length and translate that into some 'expected'
speed.
>Probably won't be 15 meg, and whatever the documentation suggests, it
>will likely be a fair amount slower then that.

>Does the vdsl truly operate in a full duplex mode with equal bandwidth
>in either direction?

>We've worked with many corporations and institutions in over 40 states
>doing network performance assessments, and seldom (if ever) do bonded
>interfaces actually work the way that you might think they work. I've not
>spent any time with the linux bonding that you're considering, but you
>might want to better understand exactly how that works. E.g., some bonding
>actually functions at 'per packet' level, which implies the maximum speed
>of any single packet is the speed of one vdsl circuit. 

>If one of the bonded circuits has errors, what impact does it have on the
>other three error-free circuits. (Its not uncommon for one interface to
>have very significant impact on all other interfaces.)

>If all of the above can be answered with positive thoughts, you'll still
>want to consider some form of QoS on those links to ensure the voip
>packets are not held in a queue.

Good suggestions, thanks. I'm going to build a prototype and do some
analysis. If it's good, I'll post to the list.