參數(shù)資料
型號(hào)： LXT332
廠商： Digital Data Communications GmbH
英文描述： 3941
中文描述： 雙T1/E1線路接口單元與水晶無(wú)衰減
文件頁(yè)數(shù)： 8/32頁(yè)
文件大小： 777K
代理商： LXT332
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ECE0
DI
Encoder Enable - Port 0.
In the Unipolar mode, a High on this pin enables
the B8ZS or HDB3 encoder and decoder for port 0.
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BPV0
DO
Bipolar Violation - Port 0.
In the Unipolar mode this indicator output goes
High when a bipolar violation is received at port 0.
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RDATA0
DO
Receive Data - Port 0.
In the Unipolar mode, RDATA is a Non-Return-to-
Zero (NRZ) output. CLKE determines the RCLK edge which RDATA is
stable and valid.
êé
éí
RDATA1
DO
Receive Data - Port 1.
In the Unipolar mode, RDATA is a Non-Return-to-
Zero (NRZ) output. CLKE determines the RCLK edge which RDATA is
stable and valid.
êè
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BPV1
DO
Bipolar Violation - Port 1.
In the Unipolar mode this indicator output goes
High when a bipolar violation is received at port 1.
ê
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ECE1
DI
Encoder Enable - Port 1.
In the Unipolar mode, a High on this pin enables
the B8ZS or HDB3 encoder and decoder for port 1.
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TDATA1
DI
Transmit Data - Port 1.
In the Unipolar mode, the data to be transmitted
onto the twisted-pair line from port 1 is input at this pin.
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TRSTE
DI
Tristate Output Enable Input Pin.
Forces all output pins to high-Z Tri-state
when held High. Enables Bipolar I/O mode when held Low. In this mode the
framer interface is bipolar (TPOS/TNEG and RPOS/RNEG), and the B8ZS/
HDB3 encoders are disabled. Enables Unipolar I/O mode when clocked by
MCLK. In this mode the framer interface is unipolar (TDATA and RDATA),
and the TNEG and RNEG pins are re-mapped. The TNEG pins are re-mapped
as Encoder Enable (ECE) to individually enable the B8ZS/HDB3 encoder/
decoder for each port. The RNEG pins are re-mapped as Bipolar Violation
(BPV) indicators to report BPVs received at the respective ports.
Transmit Clock - Port 0.
1.544 MHz for T1, 2.048 MHz for E1. The trans-
mit data inputs are sampled on the falling edge of TCLK.
Transmit Data Positive and Negative - Port 0.
In the Bipolar I/O mode,
these pins are the positive and negative sides of a bipolar input pair for port 0.
Data to be transmitted onto the twp line is input at these pins. However, when
TRSTE is clocked by MCLK, the LXT332 switches to a unipolar mode. Uni-
polar mode pin functions are described separately.
Receive Data Positive and Negative - Port 0.
In the Bipolar I/O mode, a sig-
nal on RNEG corresponds to receipt of a negative pulse on RTIP/RRING. A
signal on RPOS corresponds to receipt of a positive pulse on RTIP/RRING.
RNEG/RPOS outputs are Non-Return-to-Zero (NRZ). RPOS and RNEG are
stable and valid on the rising edge of RCLK.
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TCLK0
DI
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TPOS0
(Bipolar)
TNEG0
(Bipolar)
RNEG0
(Bipolar)
DI
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RPOS0
(Bipolar)
DO
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