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Feature Reference
Trunks and trunk groups
1742
Administrator’s Guide for Avaya Communication Manager
November 2003
Analog tie trunks
The number of tie trunks in a connection and the technology of any multiplex systems used in the
facilities affect the maximum data transfer rate. Generally, for transfer rates up to 300 bps, a connection
can have 5 tie trunks in tandem. For data rates of 301–2,400 bps, a connection can have up to 3 tie trunks
in tandem. For data rates of 2,401–4,800 bps, a connection can have up to 2 tie trunks in tandem.
Analog tie trunks used in unswitched connections can support up to 9,600 bps.
Digital tie trunks
The digital tie trunk is a high-speed and high-volume trunk interface to a T1 or E1 carrier. It uses a digital
signal level 1 (DS1) protocol. By multiplexing 24 64-kbps digital channels onto a single 1.544-Mbps T1
carrier, or 32 64-kbps digital channels onto a single 2.048-Mbps E1 carrier, DS1 offers an economical
alternative to the analog tie trunk as well as a high-speed, fully digital (without modems) connection
between the media servers or switches.
The maximum per-channel data rate for DS1 is 64 Kbps, and DS1 trunks can carry voice, voiceband data,
or high-speed data communications.
WATS — Wide Area Telecommunications
Service
Outgoing WATS service allows calls to certain areas (“WATS bands”) for a flat monthly charge.
Incoming WATS trunks allow you to offer toll-free calling to customers and employees.
Applications for different trunk types
To help you select the right type of trunk for a specific application, the following table gives you an
overview of key characteristics of different trunk groups. Remember that all analog trunks can carry only
voice and voice-grade data.
Type of trunk
Direction
Analog or
Digital?
Traffic supported
Transmits
digits?
CO, FX, WATS
Incoming
Outgoing
Two-way
Either
Any kind of voice or
data traffic.
No
CPE
N.A.
Either
Any kind of voice or
data traffic.
No
DID
Incoming
Either
Only voice and
voice-grade data.
Yes
DIOD
Incoming
Outgoing
Two-way
Either
Any kind of voice or
data traffic.
Only for
incoming calls
Содержание Communication Manager
Страница 320: ...Setting Up Telecommuting Training Users 320 Administrator s Guide for Avaya Communication Manager November 2003...
Страница 416: ...Managing Group Communications Observing Calls 416 Administrator s Guide for Avaya Communication Manager November 2003...
Страница 502: ...Administering Media Servers SNMP Agents 502 Administrator s Guide for Avaya Communication Manager November 2003...
Страница 602: ...Phone Reference Internet Protocol IP Softphones 602 Administrator s Guide for Avaya Communication Manager November 2003...
Страница 1338: ...Screen Reference Vector Directory Number 1338 Administrator s Guide for Avaya Communication Manager November 2003...
Страница 1832: ...Glossary and Abbreviations Z 1832 Administrator s Guide for Avaya Communication Manager November 2003...
Страница 1854: ...Index X 1854 Administrator s Guide for Avaya Communication Manager November 2003...