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Topic # 133396 21-Oct-2013 10:21
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My Genius arrived today but my fibre install isn't until early December.

I've seen a few comments suggesting that the ethernet ports on the Genius are only Fast Ethernet (100Mbps).  My question: what's the maximum throughput the Genius can sustain on UFB?

Many home/small business routers are built with an architecture where the ethernet ports are all on a VLAN-capable switch, and the main router CPU has a single ethernet interface to this switch.  If this is the case with the Genius, and if that connection between the CPU and the switch is merely 100MBps full duplex, then it looks like it would be impossible to get the full 100Mbps down and 50Mbps up that a UFB connection can supply, on a wired connection.

The maths: a 100Mbps full duplex port allows 100Mbps in each direction.  Traffic between a PC on the local LAN (wired), and the internet, has to transit both directions through that port.  So if I'm downloading at 100Mbps, that's 100mbps of traffic from the ONT to the CPU, and 100Mbps of traffic from the CPU to my PC -- 100Mbps in both directions.  If I try to upload 50Mbps at the same time, that's another 50Mbps in both directions ... which the switch may not support.

Now wireless mucks this analysis up a bit because it's usually attached directly to the CPU.  So you could get the full speed via wireless.  My experience with Wifi, though, is that it's never as fast as it says on the box.  Unless the Genius has especially good wifi, that won't help much.

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  Reply # 918987 21-Oct-2013 10:21
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Hello... Our robot found some keywords in your post, so here is an automated reply with some important things to note regarding broadband speeds.

 



 

If you are posting regarding DSL speeds please check that

 



 

- you have reset your modem and router

 


 

- your PC (or other PCs in your LAN) is not downloading large files when you are testing

 

- you are not being throttled by your ISP due to going over the monthly cap

 


 

- your tests are always done on an ethernet connection to the router - do not use wireless for testing

 


 

- you read this topic and follow the instructions there.

 



 

Make sure you provide information for other users to help you. If you have not already done it, please EDIT your post and add this now:

 



 

- Your ISP and plan

 


 

- Type of connection (ADSL, ADSL2, VDSL)

 


 

- Your modem DSL stats (do not worry about posting Speedtest, we need sync rate, attenuation and noise margin)

 


 

- Your general location (or street)

 


 

- If you are rural or urban

 


 

- If you know your connection is to an exchange, cabinet or conklin

 


 

- If your connection is to a ULL or wholesale service

 


 

- If you have done an isolation test as per the link above

 



 

Most of the problems with speed are likely to be related to internal wiring issues. Read this discussion to find out more about this. Your ISP is not intentionally slowing you down today (unless you are on a managed plan). Also if this is the school holidays it's likely you will notice slower than usual speed due to more users online.

 



 

A master splitter is required for VDSL2 and in most cases will improve speeds on DSL connections. Regular disconnections can be a monitored alarm or a set top box trying to connect. If there's an alarm connected to your line even if you don't have an alarm contract it may still try to connect so it's worth checking.

 



 

I recommend you read these two blog posts:

 



 

- Is your premises phone wiring impacting your broadband performance? (very technical)

 


 

- Are you receiving a substandard ULL ADSL2+ connection from your ISP?




I am the Geekzone Robot and I am here to help. I am from the Internet. I do not interact. Do not expect other replies from me.



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  Reply # 919022 21-Oct-2013 10:36
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I'm confused by your maths. The traffic doesn't traverse the WAN connection twice. The total throughput on the WAN connection on a 100/50 UFB connection will not exceed 150Mbps. As long as the device has a 100Mbps full-duplex port with enough switching bandwidth to support the ports, it'll be fine.

Let's pretend we're looking at a LAN switch, which has a router hanging off one port, and a PC off another.

100/50UFB router (fe0/1) switch (fe0/2) PC

You can be transferring 100down/50up from PC to fe0/2, which is passed at the same rate (100down/50up) to fe0/1, out to the UFB connection. Your traffic doesn't go UFB -> WAN -> switch -> WAN - > switch as your math would imply if I am interpreting your post correctly. It should not be double-handled by any port.

 
 
 
 




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  Reply # 919030 21-Oct-2013 10:45
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Inphinity: I'm confused by your maths. The traffic doesn't traverse the WAN connection twice. The total throughput on the WAN connection on a 100/50 UFB connection will not exceed 150Mbps. As long as the device has a 100Mbps full-duplex port with enough switching bandwidth to support the ports, it'll be fine.

Let's pretend we're looking at a LAN switch, which has a router hanging off one port, and a PC off another.

100/50UFB router (fe0/1) switch (fe0/2) PC

You can be transferring 100down/50up from PC to fe0/2, which is passed at the same rate (100down/50up) to fe0/1, out to the UFB connection. Your traffic doesn't go UFB -> WAN -> switch -> WAN - > switch as your math would imply if I am interpreting your post correctly. It should not be double-handled by any port.


If the internal architecture of the router is a SoC with *two* fast ethernet ports, one attached to the ONT and one to the switch, then that's fine.  Many routers cheap out and have *one* fast ethernet port on the SoC, and separate out WAN/LAN traffic by VLAN tagging in the (internal) switch -- then both WAN and LAN traffic do transit a single 100Mbps ethernet port.


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  Reply # 919063 21-Oct-2013 11:29
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Hi

The ports in the Genuis are 100mbit (as you pointed out), but the switching fabric is much more capable. The WAN port is actually just one of the switch ports on the same chip set. (Port 4).

There is no issues with getting the max out of UFB connection with the Genius modem.

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