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BritSys/MCI Package Questions

Sync speed how fast the cable modem and ISP equipment talks. Thruput is actually what you see when you upload/download stuff and what you care about and obviously can never be higher than sync speed - and typ is at most 87% of sync due to overhead.

Sync speed is guaranteed to the 1/2 of the advertised 1500/768 and thruput is guaranteed to be 50% of sync speed on Cable Buster plans. Residential plan gets 70% thruput guarantee. (Check your contract for guarantees, I am not an employee or rep).

If you sync at 1500/758 they guarantee you will get real world download of 652K and upload of 334K. If you get that or more they can't/won't refund your money, but they will work to get you up to a better range. (Note with 50% sync and 50% thruput lowest guarantee is 326K/167K).

One would think if you are currently getting 1300/330 with Covad you should get about 1300/660 with MCI.

Latency is guaranteed to 100ms, but I imagine the typ is much less. Anybody got real world reports?

This is a an MCI line (aka Worldcom, aka Rythms).
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I think you can talk to Britsys and they will run your line thru thier systems and get a good guess of line conditions.
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I assume the 50% thruput is a CYA move. How many lines actually get lower than 70% thruput?

reply to matador7
The throughput guarantee is there to reduce the time our techs and MCI tech have to spend on a line that is not getting the full speed (not sync speed) which in turn allows us to keep our costs and MCI cost down.

Some ADSL lines installed are able to sync fine at 1500/768 but the user may only be able to get 850/450 throughput due to issues on their line with interference, or problems with their ethernet card etc..

Because the line is still within the 50% SLA we are not obligated to open a trouble ticket unless there is major packet loss and the line is bouncing, POP latency 100ms+ etc...

The residential package gives you a higher throughput guarantee which allows our techs to open a trouble ticket with MCI and do further troubleshooting with the customer to determine the problem.
This is because the customer is paying a higher monthly fee for the additional support, service and 4 additional email addresses.

Dallas is a fairly under-utilized POP for MCI DSL so there are no problems with bandwidth availability and latency.

Installing on the line WITH NO DSL is a good choice, this makes sure that your have no downtime with your service.

Let me know if you have any more questions, you can IM me if you wish.

BritSys..

reply to matador7
Thanks for the feedback.

I'm still curious, is it a MCI line or is MCI buying capacity from Covad or SBC?

The DSL equipment is MCI's (Former Rhythms DSLAMS).

MCI "lease" space in the central office and connect directly to your phone line with their equipment.

Covad and SBA have their own DSLAMs in the same central office (CO).

BritSys.