Numerics

10BaseT

G L O S S A R Y

10-Mbps baseband Ethernet specification using two pairs of twisted-pair cabling (Categories 3, 4, or 5): one pair for transmitting data and the other for receiving data. 10BASET, which is part of the IEEE 802.3 specification, has a distance limit of approximately 328 feet (100 meters) per segment.

A

A-law

ITU-T companding standard used in the conversion between analog and digital signals in PCM

 

systems. A-law is used primarily in European telephone networks and is similar to the North American

 

µ-law standard. See also companding and µ-law.

AVT tones

Out-of-bound signaling as defined in RFC 2833.

C

category-3 cable

One of five grades of UTP cabling described in the EIA/TIA-586 standard. Category 3 cabling is used

 

in 10BaseT networks and can transmit data at speeds up to 10 Mbps.

CED tone detection

Called station identification. A three-second, 2100 Hz tone generated by a fax machine answering a

 

call, which is used in the hand-shaking used to set the call; the response from a called fax machine to

 

a CNG tone.

CELP

code excited linear prediction compression. Compression algorithm used in low bit-rate voice

 

encoding. Used in ITU-T Recommendations G.728, G.729, G.723.1.

CLIP

Calling Line Identification Presentation. Shows your identity to callers with Caller ID.

CLIR

Calling Line Identification Restriction. Hides your identity from callers with Caller ID.

CNG

Comfort Noise Generation.

codec

coder decoder. In Voice over IP, Voice over Frame Relay, and Voice over ATM, a DSP software

 

algorithm used to compress/decompress speech or audio signals.

companding

Contraction derived from the opposite processes of compression and expansion. Part of the PCM

 

process whereby analog signal values are rounded logically to discrete scale-step values on a nonlinear

 

scale. The decimal step number then is coded in its binary equivalent prior to transmission. The process

 

is reversed at the receiving terminal using the same nonlinear scale. Compare with compression and

 

expansion. See also a-law and µ-law.

Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide (H.323)

 

OL-4008-01

GL-1

 

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Cisco Systems ATA 188 manual GL-1
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ATA 188 specifications

The Cisco Systems ATA 188 is a versatile Analog Telephone Adapter designed to facilitate the integration of traditional telephone systems with Voice over Internet Protocol (VoIP) networks. This device has been key in bridging the gap between legacy telephony and modern IP-based communication, allowing users to leverage their existing analog phones while enjoying the benefits of digital connectivity.

One of the main features of the ATA 188 is its ability to connect regular analog phones to a VoIP network, enabling users to make and receive calls over the internet. This significantly reduces calling costs, especially for long-distance and international calls. The ATA 188 supports two phone lines, allowing simultaneous voice calls. This dual-line capability makes it a suitable choice for small businesses or home offices that require multiple lines without the need for extensive infrastructure.

The device is equipped with various technologies that enhance its functionality. It supports the Session Initiation Protocol (SIP) and H.323, making it compatible with a wide range of VoIP service providers. Additionally, the ATA 188 features Quality of Service (QoS) settings, which prioritize voice traffic over the internet, ensuring clear voice quality without interruptions or delays. This is essential for maintaining a professional communication experience, especially in business environments.

Another characteristic of the ATA 188 is its user-friendly configuration interface. It allows users to easily set up and manage their devices through a web-based portal. The configuration process is straightforward, with options to adjust settings such as codec selection, call features including call waiting, and call forwarding functionalities.

Security is also a priority for the ATA 188, as it provides robust protocols to protect call data. The device supports Secure Real-time Transport Protocol (SRTP) and Transport Layer Security (TLS) to encrypt voice traffic and manage signaling securely. This ensures that sensitive conversations remain confidential.

Overall, the Cisco Systems ATA 188 is a reliable and efficient solution for users looking to transition from traditional telephony to VoIP. Its dual-line capacity, compatibility with multiple VoIP standards, user-friendly configuration, and built-in security features make it a valuable asset for both personal and professional communication solutions. In an ever-evolving telecommunications landscape, the ATA 188 remains a relevant and practical choice for integrating legacy telephony with modern internet-based services.
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