Installation and Reference Guide HP AdvanceStack 100Base-THub-12TX, Hub-12TXM, and Switch Modules 1997-06

HP Hub-12TX/Hub-12TXM Installation and Reference Guide
Installing the System 2-15
• Verify that you have not exceeded the specified limits for any
attached media type as summarized in the following table:
Media Type Maximum Length (meters)
Twisted Pair 100
Fiber Optic 412 (single switched link - at half duplex)
2000 (single switched link - at full duplex)
160 (with Class I repeater - TX/FX links only)
131 (with Class I repeater - if any T4 links present)
208 (with 1 Class II repeater - TX/FX links only)
111 (with 2 Class II repeaters - TX/FX links only)
Table 2.5 Maximum Cable Length
• If a computer is attached to the hub, verify that its LAN
adapter is functioning properly by trying it in another
computer that has been successfully connected to the
network.
• When using a 10/100TX or 100FX Switch Port Module, both
sides of each connection must use the same transmission
mode (i.e., full or half duplex). If the device connected to
the hub operates at full duplex but does not support auto-
negotiation, then you must manually set the transmission
mode via the VT-100 console interface. (Refer to section on
Setting the Communication Mode earlier in this chapter.)
• Verify that your cable is Category 5.
If you still can’t resolve the problem, please refer to
Troubleshooting in Appendix A.