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Network speed while a backup is happening with a TC?

329 Views 6 Replies Latest reply: Feb 29, 2012 5:24 PM by Tesserax RSS
kat.hayes Level 1 Level 1 (0 points)
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Feb 28, 2012 1:04 PM

1.) Using a N network with speeds supposedly up to 20mbps, what happens to the overall network speed when a first gen TC is backing up a Mac? Will it affect streaming Netflix? Playing Xbox Live? etc.?

 

2.) Where should I have the Cat6 cables connected to make sure it backs up as quickly as possible? Just from the Modem to the TC? I am also going to use an Extreme for a roaming network, so would I also need to have cat6 from the wall to the Extreme to make sure it is as fast as can be? Anywhere else?

 

Thanks!

  • Tesserax Level 8 Level 8 (47,620 points)

    1.) Using a N network with speeds supposedly up to 20mbps, what happens to the overall network speed when a first gen TC is backing up a Mac? Will it affect streaming Netflix? Playing Xbox Live? etc.?

    Since backups and streaming must share the same overall bandwidth, there will be some loss of bandwidth to accomodate both happening simultaneously. Streaming from Netflix will NOT be affected from the ISP to the router, but may potentially be affected between the router and the Netflix host device. Same would hold true for the Xbox.

     

    2.) Where should I have the Cat6 cables connected to make sure it backs up as quickly as possible? Just from the Modem to the TC?

    First, you will only get Gigabit speeds if, as a minimum, the following are true: 1) All four pairs of wire within the cable are dedicated for data, 2) All ports have Gigabit interfaces, & 3) Ideally, all ports support Jumbo Frames.

     

    Second, CAT-6 cabling is not required for Gigabit. CAT-5e is totally capable of handling the frequency rate for Gigabit. In fact, CAT-6 was designed to support up to 10 Gigabit networking. If; however, you can obtain CAT-6 at or near the same price point as CAT-5e, then there is nothing wrong with using CAT-6.

     

    With that said, the 1st Gen TC does have Gigabit interfaces, but does support Jumbo Frames, so getting near Gigabit bandwidth will not be possible.

     

    To provide the best bandwidth for backups, you will want a Gigabit Ethernet connection between the device being backed up to the TC.

     

    I am also going to use an Extreme for a roaming network, so would I also need to have cat6 from the wall to the Extreme to make sure it is as fast as can be? Anywhere else?

    You will want CAT-6 on the cable run in the wall between routers as well. You will also not want to share any of the four pairs of wires in these cables for other purposes, like phone service. It is common practice in newer house that come pre-wired to use Ethernet runs that terminate at a wall plate that provides both an Ethernet and phone jack. Typically, they will use the same cable and connect two of the pairs for Ethernet (the minimum required for 100 Mbps Ethernet) and connect one pair for phone service. Again, Gigabit Ethernet requires all four pairs to be dedicated to data.

     

    (ref: SmallNetBuilder: Need To Know: Jumbo Frames in Small Networks)

  • Tesserax Level 8 Level 8 (47,620 points)

    1.) What do you mean by "First, you will only get Gigabit speeds if, as a minimum, the following are true: 1) All four pairs of wire within the cable are dedicated for data"?

    I mean that all four pairs of wires terminate on either end of the cable are dedicated for data. Which would also mean that to get Gigabit from point A to point B, the Ethernet runs between them must have all of these pairs available to transfer data. Again, my point is that some home wiring "dual-use" the Ethernet cable placed inside walls that terminate with some pairs for Ethernet and some for phone service.

     

    I bought CAT6 cable and haven't done anything with it. How will I know if all four pairs of wire inside the CAT6 are dedicated for data?

    By default all pre-built cables already are ... and properly terminated with RJ-45-type connectors on either end. I am referring to "raw" cable where an installer can choose how to terminate the individual pairs within the cable.

     

    2.) You said:"With that said, the 1st Gen TC does have Gigabit interfaces, but does support Jumbo Frames, so getting near Gigabit bandwidth will not be possible."

     

    For clarification, the 1st Gen TC has both Gigabit interfaces and Jumbo frames?

    Yes, the 1st Gen TCs have Gigabit Ethernet ports ... but they do NOT support Jumbo frames.

     

    3.) You said: "You will also not want to share any of the four pairs of wires in these cables for other purposes, like phone service. " when you say share the four wires, are you referring to the wires inside a CAT6 cable?

    Yes. Sorry, my intent was not to make this more confusing. I just wanted to point out that there are factors that can prevent you from achieving Gigabit throughput even though you may have "Gigabit" cables or connections.

  • Grant Bennet-Alder Level 8 Level 8 (48,180 points)

    You spoke of the Time Capsule backup finishing as quickly as possible. It appears to be optimized to use a few Network resources as possible. Because of this, it will take a little longer, but will not punish your network performance in the process of performing the backup.

     

    The first time it runs is an exception, as it backs up everything, which can take a long time. The next time it backs up only the things that have changed.

    Beige G3, G4/867, G4/dual 1.25 MDD, MacPro'09 w cheap SSD, Mac OS 8.6 or Earlier, and 9.2, 10.5 and Server - LW IIg, LW 4/600, ATalk ImageWriter L
  • Tesserax Level 8 Level 8 (47,620 points)

    So my TC does not support Jumbo Frames, so:

     

    1. Will the speed be significantly less than if it was jumbo frames?

    Not so much significantly less, but not fully Gigabit. The only way to know for sure is to take actual throughput measurements to see what you actually get. There are a number of utilities out there (free or paid) that provide these types of measurements.

     

    A few that I use are:

     

    2. Will having the TC on my N network slowdown day-to-day internet stuff similar to what putting a G router on a N network might do?

    No.

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