Can anyone confirm the following is correct? 100Base-t IEEE 802.3u) 100Base-T4 Category3 or 4 = 100Metres (4 pair) 100Base-TX Category5 = 100Metres (2 pair) 100Base-FX Multimode fibre = 2Km , single mode 10Km (100VG IEEE 802.12) Category 3 , 4 or 5 (4 pair) = 100Metres Multimode fibre = 2Km taken from google search. Problem:- no network connectivity through Network points on wall. Sceptre (network company) installed network CAT 5 cables in wall. Patch hub on 128 hub onto switch number for netpoint. No light shown on hub, used pinger in network point, no link displayed. Sceptre say the point is live. They suggest we have incorrectly patch the hub? There's only two switchs in the cabinet, ones on a 10 ip address and the others on a 128 ip address. The network and LAN card is setup for the 128 address. Q) is there a device used in networks to test how long the cables are and if there is a break in the cable? Q) what's the maximum length for fibre optic cables?