Extending DX link beyond 100m

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This topic contains 6 replies, has 3 voices, and was last updated by Profile photo of msteel msteel 3 weeks, 3 days ago.

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  • #97932
    Profile photo of msteel
    msteel
    Participant

    We expect to have a situation where we may want to extend a DX168 with a cable run longer than 100m but less than 200m from the CDM64. Unfortunately (or fortunately?) this would not be a redundant link.

    From here http://support.allen-heath.com/Knowledgebase/Article/View/gigaace-and-dx-networking-vlans-and-fibre-optics it sounds like there are probably a number of inexpensive 10/100/1000 ethernet switches that should do this job. Probably I will want a managed switch so I can turn off “green” features, etc. correct?

    Are there any particular models that are known to be reliable (or unreliable) for this application? Thanks.

    #97935
    Profile photo of SteffenR
    SteffenR
    Participant

    you don’t have to use a managed switch and only 100Mbit switches will work, no GBit
    or a switch where you can set the port speed…

    from the document

    DX Expanders

    DX links are Fast Ethernet point-to-point connections (100BASE-TX, IEEE 802.3u), Layer 2 compliant.
    Layer 2 network switches and media converters can be used, provided they support Fast Ethernet (100Base-TX) connections.

    I would suggest a network repeater with POE then you don’t need power at the switch position

    #97948
    Profile photo of msteel
    msteel
    Participant

    Thanks for the reply. In the case of a pure DX-DX connection, are there problems with it negotiating to 100mBit correctly in some cases?
    I think I remember reading that since SLink ports use the link speed to determine whether to use DX or GigaACE, they may not always correctly negotiate with a switch; but I would not expect that issue to come up with a pure DX device on both ends.

    I will investigate the ethernet repeater but since in our case we will have power available at the midpoint the POE won’t strictly be necessary.

    #97949
    Profile photo of SteffenR
    SteffenR
    Participant

    In the case of a pure DX-DX connection, are there problems with it negotiating to 100mBit correctly in some cases?

    It only works with 100Mbit switches.

    #98095
    Profile photo of Mr-B
    Mr-B
    Participant

    How about using two media converters 100Mb Ethernet to Fibre, in Multimode you should get up to 550m??

    #98096
    Profile photo of SteffenR
    SteffenR
    Participant

    Ian,
    he asks for a one time solution (at least this is what I think) so a inexpensive Fast Ethernet switch is the solution he needs.

    But the fiber solution is worth to think about, if the solution is a fixed installation.
    This separates the electric systems from each other, so no ground loops are introduced.

    #98717
    Profile photo of msteel
    msteel
    Participant

    UPDATE:

    We have tested two methods and both appear to work fine so far.

    First, the low cost ethernet switch. The switch I tested is the Netgear GS105E. I chose it because it has some management features. Since it is a gigabit switch I thought I might need to force ports to 100MB for instance, or set up VLANS. None of that was necessary, as I plugged it in between the CDM64 and the DX168 and it “just worked.”

    Second, fiber converters. We realized that the building had an existing run of fiber that was suitable, so we decided that using it was a preferred long term solution to the switch. This is mainly due to the ability to locate the wiring in a more protected manner. We are using a pair of TP-Link MC220L(UN) fiber converters with appropriate SFP optical modules. These came recommended by a network tech not only for their reliability but also for their low cost. I believe another member here was using this family of converters without problems.

    Both methods are using gigabit hardware, so in theory it should also work on a GigaACE link. I do not currently have any plans to do that, though.

    Eventually I would like to set up a test to measure the latency of the DX link over these methods since we may at some point have some microphones on the DX168 and others coming analog to the CDM64.

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