ethernet to gigabit convertor

Posted on 2006-03-20
Last Modified: 2013-11-09
i have POS machines which has ethernet port
there is a PCI slot in it, but since there is no space im unable to put gigablit NIC in it

i just like to know if there is any convertors which i can convert ethernet port to gigabit

Question by:ammadeyy
    LVL 77

    Expert Comment

    by:Rob Williams
    Ethernet is a type of networking technology. Gigabit is one speed at which Ethernet can operate, therefore it is not possible to convert from one to the other as they are the same thing. There are however different speeds at which Ethernet can operate.
    An Ethernet port can operate at 10mbps (megabits per second), 100 mbps, or 1000 mbps. The latter 1000mbps, is Gigabit. The POS device probably operates at 100mbps but any device you connect it to, even if it has Gigabit capability, would also have the ability to automatically negotiate the speed. There would also be no need to use Gigabit for a POS devices as there is just not enough data transfered to require the speed. I think you will find you can connect your devices without a problem, or is there a physical difference in the type of connectors. Some old POS devises used a coaxial BNC connector. If this is the case you would have to use an old hub with both CAT5 and BNC connectors. Perhaps you could elaborate on what you are trying to connect and we could better assust you.

    Author Comment

    my device have 100mbps, its connected CAT5 cable

    im thinking of changing switches in POS network to gigabit

    when i change the POS to gigabit will the POS machines negotiate with that speed?
    LVL 77

    Accepted Solution

    If you install a Gigabit switch the switch itself will negotiate with each device (each POS) on each port and set that port to the required speed to talk to that device. You could have devices of different speeds on each port and the Gigabit switch will do the necessary "converting" for you.

    The POS machines can also negotiate however they only the option of 10 or 100mbps, likely not Gigabit, and you mention you cannot add another network adapter, as there is no free PCI slot.

    So to answer the question, adding a Gigabit switch will work fine and the devices will negotiate the highest possible speed and duplex. Again however, if you are adding a Gigabit switch to improve performance with the POS devices I doubt you will see any difference as they just do not generate much traffic. Users who can take advantage of Gigabit are usually businesses with very large files such as Images/drawings or a very large amount of data being transfered continuously. I appreciate there may be other devices or reasons for you changing to Gigabit.
    LVL 7

    Expert Comment

    If, I understood your question correctly :-
    You have a machine which have has a Inbuilt NIC.
    Now, you want to plug another NIC of Gigabit Ranking in PCI SLOT.
    But the slot is not free. (Tell me what's there plugged to it.)

    In this situation your inbuilt NIC can only provide you Bandwidth upto :-
    10 / 100 Mbps (Mega bits Per Second) = 100 / 8 (Eight Bits make One Byte) = 12.5 (Mega Bytes Per Second)

    Gigabit = 1000 Mbps (Mega Bits Per Second) = 1000 / 8 = 125 MBitesPS (Mega Bytes /s)

    Gigabit NIC comes with a heigher Intergrated Bit Rate Processor and hence Transfer much Data /s.

    No Converter can be made to increase bandwidth. Since in comming data Transfer Rate is lower so you can't increase it.
    It Depends on the Hardware Architecture of the NIC and the Processor Chip Installed on it.

    What I mean to say is :-

    Stage 1 ---------------------> Stage 2 ---------------------------------> Stage 3                                                          
    10/ 100 Mbps  <SUPPOSED GIGABIT CONVERTER---> OUTPUTS > 10/100 Mbps only

    Even using USB to NIC converters we can only get 100 Mbps. So Solution is only PCI Slot.

    Details :-

    Author Comment

    yes there is large files images like loadin table plans, so i need higher transfer speed
    so i guess adding a gigabit switch my network will do the job , am i correct?
    LVL 77

    Expert Comment

    by:Rob Williams
    Sounds like Gigabit may be of some help since you have large files. The Gigabit switch will not improve the maximum connection speed to a given POS device, where they are restricted to 100mbps. The maximum speed is only as fast as the "weakest link".  However, assuming the server the Gigabit switch is connected to has a Gigabit adapter, the Gigabit switch will improve overall network performance for all connected devices as you will have more bandwidth to the point of the switch allowing for better 'distribution of traffic'.

    Thanks ammadeyy,

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