29
Jack PC Hardware User Manual - Training Department
Version 0506
6.4 Testing LAN Cabling
In a new installation it is difficult to test the cable before you terminated it with Flex-Jack
terminal block. After assembling the terminal block (hopefully in the proper way..) you can use
the Jack PC as a tester. You should see the Power/Fail LED light up after few seconds,
(indicating that the unit receives power) and after about 30 seconds the Link light should turn
on (indicating that there is a connecting to the network, and that the LAN wires are connected
properly.
If Power-over-Ethernet is not available – use an external power supply to power the Jack-PC
(only the one provided by Chip PC).
If PoE is available to that port and still nothing happens (two LEDs not illuminated) – try the
external power supply. If now the device is powered and the Link is on – you have a PoE
problem. If the Link LED is off – you may have a wiring problem or the other end is not
connected to anything.
Note: In most cases wrong LAN wiring will not damage the Jack PC or the switch.
6.5 Switch Settings
This paragraph covers only the LAN settings of a standard LAN switch. Power settings for
PoE will be covered at the next paragraph.
The Jack-PC has a standard 100Base-T LAN NIC with autonegotiate feature enabled by
default.
The switch settings required for managed switch are identical to a standard PC:
• Port enabled
• Autonegotiate-enabled
• 100Base-T-not disabled
• Full duplex-not disabled
• MDIIX-may be enabled or disabled
• Fast Link-enabled
Tip: In general if you can't make your switch working – try first to connect the cable to a small
unmanaged switch. If this step will be succesful – you will know that you can trust the rest of
the installation and you can just focus on the switch settings.
6.6 PoE Settings
The Jack-PC primary power source is Power-over-Ethernet (PoE) based on the industry
standard IEEE 802.3af. The power source should be able to provide Class 0 power (15.4W
maximum) although it will use much less than 15.4W in reality. See table 3 for IEEE 802.3af
power classification details.
If your PSE is capable of providing PoE based on IEEE 802.3af and still the device is not
powered, then you should check the following PSE settings (depending on specific product
features the following settings may be adjustable by the administrator):
• The PoE port is enabled
• The PoE port is set to provide Class 0 or Class 3 power level
• The PoE port is set to IEEE 802.3af (not pre-standard)
If power class is not set correctly, the Jack-PC may not start or it may start and disconnect
during the boot process or during operation.
It is important to note that the Jack-PC does not consume the full 15.4W. This class 0 setting
is only essential to assure proper PSE response to peak power requirements. In steady state
