7905 go only in 10/half

Unanswered Question
Nov 23rd, 2007
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Hi all, we have a problem with ip phones 7905, it seems that they only work in 10/half mode.

We have connected them to different catalyst switch (2950 and 2960), all in auto/auto configuration.

We observe many errors like this:


%ETHCNTR-3-HALF_DUX_COLLISION_EXCEED_THRESHOLD: Half-duplex loopback detected, collision threshold exceeded on FastEthernet0/12.


We have tried to force connection in 100full but into the phone appear a message "ethernet disconnected".


If we configure the port in trunk mode, then the phone work in 100full.


But for another problem (ip phone sw upgrade doesn't work), opening a tac case, a cisco engineer suggest us to not use trunk configuration for ip phones, and now upgrades work...


Any idea/suggestion?


Thanks

Daniele

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Rob Huffman Sat, 11/24/2007 - 10:26
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Hi Daniele,


This is the expected behaviour for the 7905G as it only only has a 10BaseT Ethernet port :)


Phones with no PC ports and with 10 Mb switch ports (Cisco Unified IP Phones 7902, 7905, and 7910) should be allowed to auto-negotiate to 10 Mb, half-duplex.


Because these phones support only 10 Mb Ethernet and their ports cannot be manually configured, the upstream switch port should be set to either AUTO negotiate or 10 Mb, half-duplex. In both cases, these phones will negotiate to 10 Mb, half-duplex.


http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_implementation_design_guide_chapter09186a00806e8c42.html


Cisco Unified IP Phone 7905G


The Cisco Unified IP Phone 7905G supports a single line, and it has a single 10BaseT Ethernet port on the back of the phone. The speaker operates in one-way listen mode only.


http://www.cisco.com/en/US/docs/voice_ip_comm/cucme/srnd/design/guide/endpts.html#wp1043347



Hope this helps!

Rob


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