參數(shù)資料
型號(hào)： MC145574
廠商： Motorola, Inc.
英文描述： ISDN S/T-Interface Transceiver
中文描述： 綜合業(yè)務(wù)數(shù)字網(wǎng)S / T的接口收發(fā)器
文件頁數(shù)： 19/164頁
文件大?。?/td> 1072K
代理商： MC145574
MC145574
2–1
MOTOROLA
The MC145574 ISDN S/T transceiver conforms to CCITT I.430, ETSI ETS 300012, and ANSI T1.605
specifications. It is a layer 1 transceiver designed for use at the ISDN S and T reference points. It
is designed for both point–to–point and multipoint operation. The S/T transceiver is designed for use
in either the network terminating (NT) mode or in the terminal endpoint (TE) applications. Two 64 kpbs
B channels and one 16 kbps D channel are transmitted in a full–duplex fashion across the interface.
Sections 2.2 through 2.6 contain suggested wiring configurations for use. These configurations are
deemed to be the most common but by no means the only wiring configurations. Section 16 specifies
the recommended circuitry for interfacing the MC145574 to the S/T bus. Note that when operating
in the TE mode, only one TE has the 100
termination resistors in the transmit and receive paths.
Figures 2–1 through 2–4 illustrate where to connect the termination resistors for the described loop
configurations.
A description of the most commonly used loop configurations is as described below.
In the point–to–point mode of operation, one NT communicates with one TE. As such, 100
termina-
tion resistors must be connected across the transmit and receive paths of both the NT and TE transceiv-
ers. Figure 2–1 illustrates this wiring configuration.
When using the MC145574 in this configuration, the NT must be in adaptive timing. This is accom-
plished by holding the FIX pin low; i.e., connecting it to VSS. Refer to Section 6 for a more detailed
description of this pin function. CCITT I.430, ETSI ETS 300012, and ANSI T1.605 specify that the
S/T transceiver must be able to operate up to a distance of 1 km in the point–to–point mode. This
is the distance D1 as shown in Figure 2–1.
NT
MC145574
D1
TE
TR
RxP
RxN
TxP
TxN
MC145574
TR
TR
TR
TxP
TxN
RxP
RxN
Figure 2–1. Point–to–Point
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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相關(guān)PDF資料
PDF描述
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MC14559B Successive Approximation Registers
MC14559BCP Successive Approximation Registers
MC1455 Timing Circuit
MC1455BD Timing Circuit
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MC145574AEG 制造商:Freescale Semiconductor 功能描述:
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