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There are also other versions of this article available: Reference | Reference9 | Reference13r1 (this version)

The transmission mode of the Ethernet interface is defined here. On phones with a configurable switch the PC and the LAN port can be configured.


The auto transmission mode is pre-selected:

auto: Automatic selection of the transmission speed.
10m-hdx: Corresponds to 10 MBit Half Duplex.
10m-fdx: Corresponds to 10 MBit Full Duplex.
100m-hdx: Corresponds to 100 MBit Half Duplex.
100m-fdx: Corresponds to 100 MBit Full Duplex.
1000m-fdx: Corresponds to 1000 MBit Full Duplex.

Phones starting with serial number from 00-90-33-03-08-68 having 10/100 MBit Ethernet.

Phones (old IP200/IP202) before this serial number are only with 10Mbit Ethernet

Disable link LED: On IP110, IP200A, IP230 and IP240/241 the link LED´s can be disabled

Isolate PC Link: see Prevent the PC Port of the Ethernet Switch from receiving Frames directly from the Phone Firmware

Use Autoneg for all speeds: By default, auto-negotiation is not used when the port is set to anything but auto. However, when this check-mark is ticked, auto-negotiation is used in the other modes too, to report the desired setting to the remote switch. Thus reduces the risk of a port configuration mismatch (provided the remote switch port is set to use auto-negotiation). This option is not available on all models.

Isolate VoIP VLAN: On IP10x and IP11x you can isolate all traffic which is tagged with the configured VlanID in the phone from the PC Port. If traffic comes in and was tagged with the same id like the phone it will not forwarded to the PC Port.

Allow 100M-LAN port and 1000M PC port: On IP241 IP222 and IP232 the link is renegotiated if one port runs at 100Mbit while the other port runs at 1000M to avoid buffer overruns in the switch. This mechanism can be disabled by setting "Allow 100M-LAN port and 1000M PC port". This settings prevents link changes e.g on the LAN link if the PC link is changing.

Disable Energy Efficient Ethernet (EEE) On IP241, IP111, IP112, IP222 and IP232 energy efficient ethernet is implemented. This feature can be disabled. On some PC´s the EEE link was not reliable, disabling EEE can solve the problem.


In addition, the status of the interface (Up or Down) and the Auto-negotiation used (for example, 100m-fdx) are displayed.

If on IP241 IP222 and IP232 one port runs at 100Mbit the other port should not use 1000M to avoid buffer overruns. In this case the 1000M port is reconfigured to 100M, the status display this.

On IP222 and IP232 EEE is implemented, the status shows if EEE is negotiated.

There is also a possibility of tracing with help of a special traceflag, which gives us information to the Link negotiation.

!config add ETH0 /ltrace
!config write

Afterwards you'll find the information in the buffer trace.

We suggest to activate this traceflag just for a testing purpose. To remove this traceflag you'll need this command:

!config rem ETH0 /ltrace
!config write
!config activate

Special Features: Ethernet MDX and EEE

IP400, IP21 and IP3000 the Ethernet interface has a switch to configure the port to be connected to a hub/switch or terminal.

On gateways with 2 Ethernet interfaces ETH0 can be connected directly to a switch port, ETH1 can be connected directly to terminal. Other connections are possible if auto-MDX is supported in the switch or in the gateway or if a crossover cable is used.

IP-Phones have an Ethernet switch, form the firmware this is seen as a single Ethernet interface. Again, the first interface can be connected directly to a switch, the second directly to a terminal ( e.g. a PC ). IP-Phones based on the INCA-IP ( IP110..IP240) do not support Auto-MDX, newer IP-Phones and IP-Phones with GIGABit Ethernet support Auto-MDX.

On IP800 and IP6000 initially a Ethernet phy is used that supports Auto-MDX only if autoneg is enabled. Leadfree versions of that phy allowed no reliable Auto-MDX at all. On newer build the phy was replaced with a type that supports Auto-MDX in all modes.

For details see this table:

Product HWBuild MDX EEE
IP400 no no
IP3000 no no
IP21 yes no
IP22 IP24 IP28 IP38 IP302 IP305 no no
IP101 IP102 n.a. no
IP110 IP150 IP200 IP230 IP240 no no
IP230-1000 IP240-1000 yes no
IP241 IP222 IP232 yes yes
IP111 IP112 yes yes
IP800 ..107 if autoneg is enabled no
IP800 108..299 no no
IP800 300.. yes no
IP6000 ..199 if autoneg is enabled no
IP6000 IP2000 200..299 no no
IP6000 IP2000 300.. yes no
IP6010, IP3010, IP0010, IP1060, IP810 yes no
IP29 IP311 IP411 IP811 IP1130 IP3011 IP0011 yes no