System design considerations

Initial Network plan

Length of cable runs

If you have a large install on multiple floors, the last thing you want are all of the Ethernet cables running back to a single location with Ethernet switch.
It may be worthwhile to review have individual switches on each floor/area and have a GBIC style backbone linking then together.
This will reduce cables runs and allow for future expansion of more local cable runs.

Wireless (WAP coverage)

Solid walls and external RF noise can reduce the coverage of wireless networks. Additional of wiring with with PoE capability or power sockets beside the ethernet terminations should be considered. Also in-ceiling wiring for addition of ceiling mounted