Cisco Systems 8861 Manual De Usuario
Not all Cisco IP Telephony products support external devices, cords or cables. For more information,
consult the documentation for your endpoint.
consult the documentation for your endpoint.
Note
Depending on the quality of these devices and their proximity to other devices, such as mobile phones or
two-way radios, some audio noise may still occur. In these cases, Cisco recommends that you take one or
more of these actions:
two-way radios, some audio noise may still occur. In these cases, Cisco recommends that you take one or
more of these actions:
• Move the external device away from the source of the RF or AF signals.
• Route the external device cables away from the source of the RF or AF signals.
• Use shielded cables for the external device, or use cables with a better shield and connector.
• Shorten the length of the external device cable.
• Apply ferrites or other such devices on the cables for the external device.
Cisco cannot guarantee the performance of external devices, cables, and connectors.
In European Union countries, use only external speakers, microphones, and headsets that are fully compliant
with the EMC Directive [89/336/EC].
with the EMC Directive [89/336/EC].
Caution
USB Port Information
The Cisco IP Phones 8851 and 8861 support a maximum of five devices that connect to each USB port. Each
device that connects to the phone is included in the maximum device count. For example, your phone can
support five USB devices on the side port and five additional standard USB devices on the back port. Many
third-party USB products count as multiple USB devices; for example, a device containing a USB hub and
headset can count as two USB devices. For more information, see the USB device documentation.
device that connects to the phone is included in the maximum device count. For example, your phone can
support five USB devices on the side port and five additional standard USB devices on the back port. Many
third-party USB products count as multiple USB devices; for example, a device containing a USB hub and
headset can count as two USB devices. For more information, see the USB device documentation.
Note
• Unpowered hubs are not supported, and powered hubs with more than four ports are not supported.
• USB headsets that connect to the phone through a USB hub are not supported.
Each Cisco IP Phone 8800 Key Expansion Module (KEM) connected to the phone counts as a USB device.
If three KEMs are connected to the phone, these count as three USB devices.
If three KEMs are connected to the phone, these count as three USB devices.
Phone Configuration Files
Configuration files for a phone are stored on the TFTP server and define parameters for connecting to Cisco
Unified Communications Manager. In general, any time you make a change in Cisco Unified Communications
Manager that requires the phone to be reset, a change is automatically made to the phone configuration file.
Unified Communications Manager. In general, any time you make a change in Cisco Unified Communications
Manager that requires the phone to be reset, a change is automatically made to the phone configuration file.
Configuration files also contain information about which image load the phone should be running. If this
image load differs from the one currently loaded on a phone, the phone contacts the TFTP server to request
the required load files.
image load differs from the one currently loaded on a phone, the phone contacts the TFTP server to request
the required load files.
Cisco IP Phone 8811, 8841, 8851, and 8861 Administration Guide for Cisco Unified Communications Manager 10.5
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USB Port Information