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參數(shù)資料
| 型號： | XRT4500CV |
| 廠商： | EXAR CORP |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | MULTIPROTOCOL SERIAL NETWORK INTERFACE IC |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PQFP80 |
| 封裝： | 14 X 14 MM, 1.40 MM HEIGHT, TQFP-80 |
| 文件頁數(shù)： | 40/99頁 |
| 文件大?。?/td> | 1384K |
| 代理商： | XRT4500CV |
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XRT4500
MULTIPROTOCOL SERIAL NETWORK INTERFACE IC
REV. 1.0.7
37
1.0
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
SYSTEM DESCRIPTION
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*
N
OTE
:
*Option Signals, per the “ITU-T V35 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.
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