XRT4500CV datasheet(40/99 Pages) EXAR

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XRT4500

MULTIPROTOCOL SERIAL NETWORK INTERFACE IC

REV. 1.0.7

1.0

SYSTEM DESCRIPTION

The XRT4500 Multi-protocol Serial Network Interface

IC is a flexible transceiver chip that is capable of sup-

porting the following “Communication Interfaces”.

• ITU-T V.35

• ITU-T V.28/EIA-232

• EIA-449

• ITU-T V.36

• ITU-T X.21

• EIA-530

• EIA-530A

The XRT4500 uses the following “electrical interfac-

es” in order to realize each of these “Communication

Interfaces”.

• ITU-T V.11/EIA-422

• ITU-T V.10/EIA-423

• ITU-T V.35

• ITU-T V.28/EIA-232

1.1

THE DIFFERENCE BETWEEN AN ELECTRI-

CAL INTERFACE AND A COMMUNICATIONS

INTERFACE

It is important to describe the difference between an

Electrical Interface specification and a Communica-

tions Interface specification. An Electrical Interface

specification defines the electrical characteristics of a

transmitter or receiver. These characteristics include

voltage, current, impedance levels, rise/fall times and

other similar parameters. Examples of electrical inter-

faces are ITU-T V.10 (EIA-423), ITU-T V.11 (EIA-

422), V.35 and V.28 (EIA-232).

In contrast, a Communications Interface specification

describes a “Physical Layer” interface in its entirety.

This description includes the names and functions of

all of the involved signals. The Communications Inter-

face specification identifies which electrical interface

is to be used to realize each of these signals as well

as the connector type. Examples of communication

interface types include ITU-T V.35, ITU-T V.28 (EIA-

232), EIA-449, EIA-530A, ITU-T X.21, and ITU-T

V.36.

For example, the “ITU-T V.35 Communications Inter-

face” specification requires that each of the following

signals must comply with the “ITU-T V.35 Electrical

Interface” requirements.

• RXD - Receive Data (CCITT Circuit 104)

• TXD - Transmit Data (CCITT Circuit 103)

• RXC - Receive Clock (CCITT Circuit 115)

• TXC - Transmit Clock (CCITT Circuit 114)

• SCTE (or TXCE) - Transmit Clock Echo

Also, the ITU-T V.35 Communications Interface speci-

fication states that each of the following signals must

comply with the “ITU-T V.28 Electrical Interface” re-

quirements.

• RTS - Request to Send (CCITT Circuit 105)

• CTS - Clear to Send (CCITT Circuit 106)

• DTR - Data Terminal Ready

• DSR - Data Set Ready (CCITT Circuit 107)

• DCD - Data Carrier Detect (CCITT Circuit 109)

• RL - Remote Loop-back Indicator*

• LL - Local Loop-back Indicator*

• TM - Test Mode Indicator*

NOTE: *Option Signals, per the “ITU-T V.35 Electrical Interface”

Finally, the “ITU-T V.35 Communications Interface”

recommends the use of the ISO-2593 34 pin Connec-

tor. (See Figure 46 connector drawings on page 73).

The XRT4500 contains a sufficient number of receiv-

ers, transmitters and transceivers to transport all of

the signals required for each of the above-mentioned

Communication Interface standards. By configuring

the XRT4500 to operate in a particular “Communica-

tion Interface” Mode, each of the Transmitters and

Receivers will automatically be configured to support

the appropriate “Electrical Interface” requirements.

Table 3 and Table 4 present the relationship between

the Communication Interface Mode that the

XRT4500 has been configured to operate in and the

corresponding Electrical Interface Mode that a giv-

en Transmitter or Receiver will be automatically con-

figured in.

Table 3 presents this information for the XRT4500

configured to operate in the DTE Mode. Table 4 pre-

sents this information when the XRT4500 has been

configured to operate in the DCE Mode.

XRT4500CV Datasheet(PDF) 40 Page - Exar Corporation

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