Instruction manual

CHAPTER 1.
INTRODUCTION
Contents Page
Functional Description ......................... 1-1
Typical Applications and System Design Considerations ....... 1-7
Technical Specifications ........................ 1-14
1-1. FUNCTIONAL DESCRIPTION
Purpose and Main
Features
The DV-MUX3 is a versatile adaptive time division multiplexer (TDM) for voice,
fax, and data. The DV-MUX3 allows the multiplexing of one or two low bit rate
voice/fax channels with one synchronous data channel, for transmission through a
dial-up or leased-line modem link operating at rates in the range of 9.6 through
256 kbps. Asynchronous data can also be transmitted by using asynchronous-to-
synchronous converters, or by oversampling (for oversampling, the asynchronous
data rate must not exceed 1/4 of the synchronous channel rate).
Bandwidth efficiency is obtained by very low multiplexing and link supervision
overhead. In addition, the DV-MUX3 offers three user-selectable multiplexing
modes that allow maximization of the bandwidth efficiency while taking into ac-
count the characteristics of the user equipment:
• Maximal bandwidth efficiency is achieved in the proprietary adaptivemode.
In this mode, the DV-MUX3 dynamically reassigns the link bandwidth used
by the voice channels to the data channel when both voice channels are idle.
In this mode, the data channel can serve statistical multiplexers, remote
bridges, and other equipment that tolerates changes in the link data rate.
• The other two multiplexing modes, intended for use with equipment that is
not capable of handling the varying clock rate of the adaptive mode, are
standard (non-adaptive) modes that support predetermined channel data
rates (see para. 1-2). The non-adaptive modes differ only in the supported
data rates:
°
One non-adaptive mode supports the standard data rates (based on the
n × 75 bps scheme). In this mode, the data channel can serve all types of
data terminal equipment.
DV-MUX3 Installation and Operation Manual 1-1