HomePNA Switch Installation and Setup Manual
24
HomePNA Switch Causes Inoperable or Malfunctioning PBX
There are many models of PBX worldwide today. Some PBX
does not correspond to certain standards when it comes to data
transmission and FDM (Frequency Division Multiplexing).
Occasionally, when a HomePNA switch is installed on a system with a
PBX, the PBX will cease to operate or the HomePNA switch stops
functioning. The problem occurs due to the two devices use FDM to
allow the sharing of the telephone wire. When one device is attached
to the other, the impedance values begin to change the expected
frequency responses, rendering both devices making one of them
unusable.
Solution:
Install an impedance matching filter to correct the frequency
domain shift. Depending on the frequency domain, type of PBX, and
amount of impedance shift a filter may be needed between the PBX and
the MDF or the CPE and Telephone set equipment. Contact your
vendor for more information on troubleshooting impedance matching
and the installations of Filter and Tester kits.
Standard Ethernet Frame Dropping
The HomePNA Switch will discard all illegal frames per Ethernet
Standards:
1. Packets Less Than 64Bytes
2. Oversized Packets Larger Than 1522Bytes
3. Bad CRC Frames
All Ports Show Collision and Flashing Link Lights
Reset the switch through the command interface or power cycle
the unit.
Cannot Connect To Internet or WAN From HomePNA Ports
Verify port and link status connecting to the router in the trunk unit. If
LED is on, ping Gateway to see if routing is configured correctly. If
LED is off, check RJ-45 cable to see if cross-over cable is being used.
