參數(shù)資料
型號: 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): 20/164頁
文件大小: 1072K
代理商: MC145574
MC145574
2–2
MOTOROLA
The short passive bus is intended for use when up to eight TEs are required to communicate with
one NT. The TEs can be distributed at any point along the passive bus, the only requirement being
that the termination resistors be located at the end of the passive bus. Figure 2–2 illustrates this wiring
configuration. CCITT I.430, ETSI ETS 300012, and ANSI T1.605 specify a maximum operational dis-
tance from the NT of 200 meters. This corresponds to the distance D2 as shown in Figure 2–2.
D2
NT
TR
TxP
TxN
RxP
RxN
MC145574
TR
TR
TR
TxP TxN RxP RxN
TE
MC145574
TxP TxN RxP RxN
TE
MC145574
TxP TxN RxP RxN
TE
MC145574
Figure 2–2. Short Passive Bus
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A wiring configuration whereby the TEs are restricted to a grouping at the far end of the cable, distant
from the NT, is shown as the “Extended Passive Bus.” This configuration is shown in Figure 2–3. The
termination resistors are to be positioned as shown in Figure 2–3.
D4
NT
TR
TxP
TxN
RxP
RxN
MC145574
TR
TR
TR
TxP TxN RxP RxN
TE
<
MC145574
TxP TxN RxP RxN
TE
>
MC145574
D3
Figure 2–3. Extended Passive Bus
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F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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