Network design

We are moving our business to a new building and I have the opportunity to redesign the network layout.  We are running a microsoft network using two servers and about 45 workstations.  Currently, we have a Cisco 1900 series switch in the center of the network, with six Cicso 1548 hubs servering each workgroup.   Each 1548 hub is uplinked into the 1900 switch (10 meg ports).  Our two servers are plugged directly into the switchs 100 meg ports.
 
The new building is significantly larger than our existing building, so the cable runs will have to be much longer between the switch and the hubs (150 feet or more if we keep the same basic configuration).

Is there a better way to lay this out?  

Also, I know the 10 meg cisco switch is old and probably should be upgraded.  What would you recommend as a replacement.

Thanks
pdbernierAsked:
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bbaoIT ConsultantCommented:
the major issue for you is length. you may use switches to expand the length your network spans over, the backbone should be the connections between switches, still use hubs to uplink to the switches. you'd better make the topology looks balanced. as for the old hubs, if your applications dont need high-speed network, thats ok, no need to upgrade.

hope it helps
bbao
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pdbernierAuthor Commented:
Are there any limit to the number of switches/hubs that you can/should use?
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bbaoIT ConsultantCommented:
for 10 mbps hub, max 3 hubs can be linked in cascade. for 100 mbps hub, only 2 hubs allowed
for any kind of switches, no limit number, you can connect any number switches together if you can.
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