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Wireless Networks Thread, Media convertors in Technical; Ok think this is a silly question but want reassurance So currently we have two buildings linked together by a ...
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    sparkeh's Avatar
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    Media convertors

    Ok think this is a silly question but want reassurance

    So currently we have two buildings linked together by a fibre connection that extends our curriculum network. As none of the switches have fibre modules, the link goes to a media converter, then into a switch.

    I now need to run a separate connection over the fibre for an admin station in the second building. The theory seems fine; the fibre termination box has connections free for fibre cables that can run to media converters with the one in the main building going to the VLAN switch and the second going straight to the patch panel to give us an admin link.

    However, I have never bought any equipment for this kind of thing (or really had much to do with it) so don't know if there are any 'types' or compatibility issues. There seems a lot of jargon that I might have to wade through.

    Can I just pick up any media converter and fibre cables or am I going to have to look more closely at specs and protocols or anything?

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    dezt's Avatar
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    I have a similar setup, 1 fibre link between 2 buildings with media convertors being used. I have set the ports on the switches at either end as uplink ports for Vlans and they work fine.

    No extra kit was purchased.

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    sparkeh (18th June 2008)

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    I now need to run a separate connection over the fibre for an admin station in the second building.
    I don't understand ... do you need to run a 'new' fibre cable or do you just want to add an additional workstation?

    If you need to run a new fibre cable for 1 PC, that could get expensive ...

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    FN-GM's Avatar
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    I know with Cisco switches when you setup VLANs you will be able to run 2 VLANs over one connection between the two switches. This feature is called trunking.

    Basically what he is trying to say (I think) he wants two run 2 VLANs over one fibre connection.

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    sparkeh (18th June 2008)

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    localzuk's Avatar
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    Quote Originally Posted by kmount View Post
    I don't understand ... do you need to run a 'new' fibre cable or do you just want to add an additional workstation?

    If you need to run a new fibre cable for 1 PC, that could get expensive ...
    He has a multi-core fibre it sounds like. With 1 pair in use already and with spare pairs.

    A pair of any of these would do the trick. Note that you'd also need to buy SFP or GBIC modules for them too clicky. Also, make sure you buy the correct type of fibre patch leads to go between the panel and the converters. They should be of the same spec as the fibre itself.

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    sparkeh (18th June 2008)

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    SYNACK's Avatar
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    You can do this, we had our network running over these a while ago. You will need a couple of converters like this:
    D-Link DMC-700SC Media Converter

    and the appropriate patch leads to convert from the connectors that are on the patch panel to the ones on the converter. Your patch lead will also need to be the same type of fibre as the main fibre run between building ie OM3 otherwise you will get massive signal loss. This should be written in small print on the side of the existing patch leads that you are using you are looking for something like OM3 or a measurement like 45u.

    The other thing to take into account is the distance involved, if the fibre run is more that 550 meters you can't use SX (multimode) as it will not make the distance. You would have to use LX converters to extend the range out to 10km.

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    sparkeh (18th June 2008)

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    Joedetic's Avatar
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    Just so there's no confusion following on from what FN-Greatermanchester has said.

    VLAN Trunking and the 802.1q standard are NOT vendor specific.

    But yes, you could use VLAN trunking but have a think about your bandwidth requirements before you do that.

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    FN-GM's Avatar
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    I know that, just don’t know any specific brands and models of the top of my head. I just used Cisco because i know it is capable of doing it.

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    Pretty much all layer 2 managed switches.

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    ASJ
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    Most HP Procurve switches will as well.

    VLAN's are the way we go. With proper planning means you can let the new network be potentially invisible to the rest of the network.

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    plexer's Avatar
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    Do you need the admin machine in the other building to be hidden from what's allready there?

    You say you allready have a fibre connection into a switch on that side so why just run a new copper port to where the machine is?

    Ben

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    localzuk's Avatar
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    Quote Originally Posted by plexer View Post
    Do you need the admin machine in the other building to be hidden from what's allready there?

    You say you allready have a fibre connection into a switch on that side so why just run a new copper port to where the machine is?

    Ben
    From his post it seems they have a split network.

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    sparkeh's Avatar
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    Thanks for all the replies! You have really helped

    Let me clarify a bit:

    Quote Originally Posted by kmount View Post
    I don't understand ... do you need to run a 'new' fibre cable
    No, its like this:

    Quote Originally Posted by localzuk View Post
    He has a multi-core fibre it sounds like. With 1 pair in use already and with spare pairs.
    But said more concisely and eloquently

    Quote Originally Posted by plexer View Post
    Do you need the admin machine in the other building to be hidden from what's already there?

    You say you already have a fibre connection into a switch on that side so why just run a new copper port to where the machine is?

    Ben
    Sorry not sure what you mean but I think that:

    Quote Originally Posted by localzuk View Post
    From his post it seems they have a split network.

    Answers it.

    Just to be perfectly clear here is a, hopefully better, description

    We have two buildings, Building A (main building) and Building B (secondary building).

    Building A has a VLAN switch that separates the curriculum and admin network in Building A.

    When Building B was built a fibre cable was used to join the two buildings. The terminal box (is that what its called?) has space for 8 separate connections.

    Currently, in the VLAN in Building A, there is a connection from a Curriculum port to a media converter and onto the fibre box. In Building B, the fibre goes to another converter and from there into a switch, extending the curriculum network to Building B.

    So, I want to take an Admin port, and connect to a media converter and onto the fibre box. In Building B, the fibre will go to another converter and from there straight into the patch panel, extending the Admin network to one wall socket in Building B.

    So, in summary, after reading these posts, I just need to make sure that I purchase the correct converters in relation to the distance involved and the right cables from the fibre to the converter (both if which I can get from the existing equipment).

    Phew mammoth post!
    Correct me if I am wrong

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    plexer's Avatar
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    Can't you make the port which you would plug the admin pc into in building b and vlan it into the vlan for admin in building a?

    ben

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    dezt's Avatar
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    Quote Originally Posted by sparkeh View Post

    Just to be perfectly clear here is a, hopefully better, description

    We have two buildings, Building A (main building) and Building B (secondary building).

    Building A has a VLAN switch that separates the curriculum and admin network in Building A.

    When Building B was built a fibre cable was used to join the two buildings. The terminal box (is that what its called?) has space for 8 separate connections.

    Currently, in the VLAN in Building A, there is a connection from a Curriculum port to a media converter and onto the fibre box. In Building B, the fibre goes to another converter and from there into a switch, extending the curriculum network to Building B.

    So, I want to take an Admin port, and connect to a media converter and onto the fibre box. In Building B, the fibre will go to another converter and from there straight into the patch panel, extending the Admin network to one wall socket in Building B.

    So, in summary, after reading these posts, I just need to make sure that I purchase the correct converters in relation to the distance involved and the right cables from the fibre to the converter (both if which I can get from the existing equipment).

    Phew mammoth post!
    Correct me if I am wrong
    Like I said earlier, we have an exact same setup here, we have a fibre link to building B from Building A. on each end of the fibre link is a media convertor going into port 24 on a switch. on the VLAN setup we have VLAN 1 for curriculum network and VLAN 2 for Admin network. We require 1 port in building B to be setup for the admin network. the switch in building A is setup for port 24 as an uplink port. Then we have setup port 24 in building B as an uplink port as well. then we have added port 10 as VLAN 2 for admin access.

    We did not need to buy any extra equipment to do this.

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