compression

CoS

Glossary

The running of a data set through an algorithm that reduces the space required to store or the bandwidth required to transmit the data set. Compare with companding and expansion.

Class of service. An indication of how an upper-layer protocol requires a lower-layer protocol to treat its messages. In SNA subarea routing, CoS definitions are used by subarea nodes to determine the optimal route to establish a given session. A CoS definition comprises a virtual route number and a transmission priority field. Also called ToS.

D

DHCP

Dynamic Host Configuration Protocol. Provides a mechanism for allocating IP

 

addresses dynamically so that addresses can be reused when hosts no longer

 

need them.

dial peer

An addressable call endpoint. In Voice over IP (VoIP), there are two types of

 

dial peers: POTS and VoIP.

DNS

Domain Name System. System used on the Internet for translating names of

 

network nodes into IP addresses.

DSL

Digital subscriber line. Public network technology that delivers high bandwidth

 

over conventional copper wiring at limited distances. There are four types of

 

DSL: ADSL, HDSL, SDSL, and VDSL. All are provisioned via modem pairs,

 

with one modem located at a central office and the other at the customer site.

 

Because most DSL technologies do not use the whole bandwidth of the twisted

 

pair, there is room remaining for a voice channel.

DSP

DTMF

Digital signal processor. Specialized hardware and software algorithms that perform complex processing of digitized data that was originally analog data. Typically segments a voice signal into frames and stores the frames in voice packets.

Dual tone multifrequency. A type of signaling that combines two distinct frequencies to generate a tone for each digit or character dialed, which is used by customers to signal the network. Sometimes referred to as “touchtone,” because a customer generally touches keypad keys to generate the tones.

 

 

Cisco IP Phone Models 7905G and 7912G Administrator Guide (SIP)

 

 

 

 

 

 

OL-4277-01

 

 

GL-3

 

 

 

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Cisco Systems 7912G, 7905G manual GL-3
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7912G, 7905G specifications

Cisco Systems is a leading provider of networking and telecommunications equipment, and among its extensive range of products, the Cisco 7900 Series of IP phones has made a notable impact in enterprise communication. Key models in this series include the Cisco 7905G, 7912G, and 7902G, each designed to enhance productivity through advanced features, intuitive interfaces, and robust technology.

The Cisco 7905G is designed for basic telephony needs and is ideal for administrative environments or areas with high call volumes. It features a large single-line LCD display, providing users with clear visibility of call information. The phone supports Power over Ethernet (PoE), making installation easier and reducing clutter by eliminating the need for an additional power supply. Its hands-free and headset support enhances user convenience, allowing for easy multitasking during calls.

Moving on to the Cisco 7912G, this model is designed for more demanding communication requirements. It features a larger, backlit display, providing improved visibility in various lighting conditions. The Cisco 7912G supports up to 12 programmable line or feature keys, giving users the flexibility to tailor the phone to their specific needs. Additionally, it incorporates advanced audio technologies, such as wideband audio for enhanced voice clarity and a built-in speakerphone, allowing users to communicate effectively in busy environments.

The Cisco 7902G, while offering basic features, is a reliable choice for users who need straightforward, cost-effective telephony solutions. It features an intuitive design with three dedicated buttons for line status, a built-in speakerphone, and support for wideband audio. The phone is geared for users who require essential telephony features without the complexity of additional functionalities, making it suitable for front-desk and general office use.

Overall, these models within the Cisco 7900 series exemplify the company's commitment to providing high-quality enterprise communication tools. With a focus on advanced audio technologies, user-friendly interfaces, and adaptability to various business environments, the Cisco 7905G, 7912G, and 7902G cater to the diverse needs of modern organizations. As companies continue to pursue seamless communication, these IP phones remain a valuable asset in their telephony infrastructure, enhancing collaboration and productivity among teams everywhere.
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