Cisco Systems 7940G 사용자 설명서

The back of the Cisco Unified IP Phones 7960G and 7940G have two RJ-45 ports labelled 10/100 SW 
and 10/100 PC. Each port supports 10/100 Mbps half- or full-duplex connections to external devices. 
You can use either Category 3 or 5 cabling for 10-Mbps connections, but you must use Category 5 for 
100 Mbps connections. On both the network port and access port, use full-duplex mode to avoid 
collisions.

Use the 10/100 SW port to connect the phone to the network. You must use a straight-through cable on 
these ports. The phone can also obtain inline power from the Cisco Catalyst switch over these 
connections. See the 

 for details.

Use the 10/100 PC port to connect a network device, such as a computer, to the phone. You must use a 
straight-through cable on this port.

The handset is designed especially for use with a Cisco Unified IP Phone. It includes a light strip that 
indicates incoming calls and voice messages waiting.

To connect a handset to the Cisco Unified IP Phone, plug the cable into the handset and the Handset port 
on the back of the phone.

By default, the speakerphone is enabled on Cisco Unified IP Phones.

You can disable the speakerphone through the Cisco Unified Communications Manager Administration 
application. To do so, choose Device > Phone and locate the phone you want to modify. In the Phone 
Configuration window for the phone, Product Specific Configuration area, check the Disable 
Speakerphone check box. 

Although Cisco Systems performs internal testing of third-party headsets for use with the Cisco Unified 
IP Phones, Cisco does not certify or support products from headset or handset vendors.

In some instances, the mechanics or electronics of various headsets can cause remote parties to hear an 
echo of their own voice when they speak to Cisco Unified IP Phone users.

Cisco recommends the use of good quality external devices, for example, headsets that are screened 
against unwanted radio frequency (RF) and audio frequency (AF) signals. Depending on the quality of 
headsets and their proximity to other devices such as cell phones and two-way radios, some audio noise 
or echo may still occur. An audible hum or buzz may be heard by either the remote party or by both the 
remote party and the Cisco Unified IP Phone user. Humming or buzzing sounds can be caused by a range 
of outside sources; for example, electric lights, electric motors, or large PC monitors.

 

, for more information.

In some cases, hum may be reduced or eliminated by using a local power cube or power injector.