connecting 2 hubs

The problem that you are having is that you have exceeded the recommended 100 meter length for cat 5 cabling. If you wish to set this up you may need to either add a repeater or two. The best step to take is if this is a home or small office you maywant to consider moving to HPNA or wireless. At the least you should consider using switches in the place of the hubs. If you need any further assistance please contact me.

Hi ,
I can say that I m in a similar setup of urs , but what I have made the backbone with coax .Eventhough its a cost effective solution ,its a not rigid solution. But i don't face problems unless there is some disturbances in the connectors & cables. Mail me for I can u the network layout.

Thanks,
Kias

Hi
In first part of question you mentioned 2 HUBs.
When you describe the spaces between equipments you mentioned HUB1, HUB2 and HUB3 there is something wrong or I don’t understand your configuration.
If you don’t have a cable which exceeded 90m all is OK.
You must use uplink switches depends by your equipments documentation and how you cascading HUBs. If you use correct uplink switches you don’t need a crossover cable.
Good luck

First of all let me tell you that you don’t have exceeded any distance limitation. If the numbers you give are correct, any segment is longer than 100 meters. Even you have only three repeaters (the hubs count like repeaters for the 4-3-2 rule; because I’m sure you are talking About Class II devices), and if you have population (computers connected) to the external hubs (to the first and the third) the communication should be correct. To be more realistic, let me tell you that even if you break this rule and populate some other segments (like the second hub) you still, in many cases, and depending on multiple variables, will be able to make your network work; but this is not recommended because Murphy’s states that when you most need the network it will not work properly.
You have used the uplink port in HUB 1, but you don’t say anything about uplinks ports in the other HUBs. Even if the second port has an uplink port I’m sure it is only one, so you don’t have this kind for connecting second and third HUBs. The rule is easy, if you connect HUBs using uplink ports you must use normal patch cords; but if you connect them using normal ports you need to use crossover patch cords.
If you want to use coaxial wire, switches or wireless solutions is up to you, but should be able to make your actual configuration work properly.

Jose P. Mir
jpm@jpmir.net

If the workstation is accessible from the server via network neighborhood, your physical and data link layer must be OK. Perhaps you should verify that both devices are on the same subnetwork. On NT /W2K Dos Prompt, type> ipconfig /all or on Win9x, type> winipcfg /all to display you NIC IP address. If you have DHCP running on the server and assigning IP to your workstation, it may be timing out and Windows may assign its own beginning with 169.xxx.xx.xxx

Quit playing with it and go to fiber.

Lee

1- Every time you cross the limits on specifications of cables and/or repeater you are starting a "got luck" game. I advise you: DON'T. You will have a lot more headeach than it is worth.

2- Specifications for communications work on limits of signal attenuation and near end cross-talk (NEXT); once this criteria is reached in a stable basis, doesn't matter the length of the cable.

3- However, safe limits for certified CAT-5 cables are 100 meters; if you exceed this limit, you are gambling.

4- Since you are not exceeding it, you should consider other types of interference that can scramble the signal for 280 meters; eletromagnetic fields of monitors, transformers and machines can do that. In this case, I would recommend using fiber all the way or, at least, shielded TP (and ground it if possible) connecting the hubs.

5- the sequence to connect two hubs or switches should be uplink-to-standard port; if you connect two hubs via only uplink or only normal port, you need a crossover cable.

6- Standard states that should be not more then 4 (four) repeaters between two single terminal nodes in an ethernet sequence; count each hub or switch in a cascading structure as one repeater. This has more to do with the timming to repeat the packages then the mere presence of the hubs or switches, so 4 is a pratical limit.

So if I have read right:

|--90m--|---75m--|---75m--|
Server--Hub1-----Hub2-----Hub3-----Client

Link Server to a Hub1 STANDARD port with a STRAIGHT UTP cable;

Link Hub1 UPLINK port to a Hub2 STANDARD port with a STRAIGHT STP cable;

Link a Hub2 STANDARD port to Hub3 UPLINK port with STRAIGHT STP cable;

Link Client to a Hub3 STANDARD port with a STRAIGHT STP cable;

--Sedrez

This question was auto closed due to inactivity