MC145574AAER2 Freescale Semiconductor, MC145574AAER2 Datasheet - Page 20

• Manufacturer Part Number: MC145574AAER2
• Manufacturer: Freescale Semiconductor

Specifications of MC145574AAER2

• Number Of Line Interfaces: 1
• Control Interface: HDLC
• Lead Free Status / Rohs Status: Compliant

2–2
2.3
2.4
SHORT PASSIVE BUS OPERATION
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.
EXTENDED PASSIVE BUS OPERATION
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.
TR
TR
TR
TR
<
<
TxP TxN RxP RxN
TxP TxN RxP RxN
MC145574
MC145574
TE
TE
Freescale Semiconductor, Inc.
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For More Information On This Product,
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Figure 2–3. Extended Passive Bus
TxP TxN RxP RxN
Figure 2–2. Short Passive Bus
MC145574
MC145574
>
TE
TxP TxN RxP RxN
MC145574
TE
D2
D4
TxP TxN RxP RxN
MC145574
TE
TR
TR
TR
TR
>
>
TxP
TxN
RxP
RxN
TxP
TxN
RxP
RxN
MOTOROLA
MC145574
MC145574
NT
NT