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STU2071FN bảng dữ liệu(PDF) 11 Page - STMicroelectronics

tên linh kiện STU2071FN
Giải thích chi tiết về linh kiện  4B3T U INTERFACE CIRCUIT
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POWER DOWN STATE
Power consumption of most functions is reduced;
module interface is not active; C/I messages can-
not be exchanged.
ACTIVATION DEACTIVATION
The ACTIVATION procedure consists of three
steps: AWAKE, SYNCHRONIZE and CONNECT
THROUGH.
Activation times are (max):
COLDSTART 1 sec
WARMSTART 170 msec
The DEACTIVATION procedure consists of two
steps: line DEACTIVATION and POWER DOWN.
Deactivation time is (typ) 4 ms.
OSCILLATOR
Oscillators of 15.36 MHz are required. When in
NT a tollerances of +/-30 ppm is allowed, it is ad-
visable to use in LT a tollerances of +/-20 ppm.
LINE RANGE
The LINE RANGE depends on the cable section.
Typically:
up to 4.2Km with 0.4mm cable
- 5.5Km - 0.5mm -
- 8.0Km - 0.6mm -
Assumed noise level for such performances is
10uV/SQRT(Hz) on a 200KHz bandwidth.
LT CLOCK JITTER
The
phase
jitter
between
Master
Clock
(15.36MHz)
and
interface
clock
(4.096MHz)
should not exceed 50ns.
LT mode COMMANDS (DIN)
ACT
1 0 0 0
Activate.
UIC is set in power-up state, executing the complete activation of Layer 1. The
transparent channel transmission is enabled.
AL
1 0 0 1
Analog Loop.
The analog transmitter output is looped back to the receiver input which is
disconnected from UK0 interface. A pseudo wake-up procedure is executed.
L2
1 0 1 0
Loop 2.
Command to close Loop 2 in NT.
LTD
0 0 1 1
Line Transmission Disabled.
UIC stops transmitting signals on the line and is powered down.
DEAC
0 0 0 0
Deactivate.
Request to deactivate UK0.
RES
1 1 0 1
Reset.
Reset the UIC to the initial state.
SSP
0 1 0 1
Send Single Pulse.
The UIC transmits single pulse at 1 ms time intervals with alternate polarity.
L4
1 0 1 1
Repeter loop
LT mode INDICATION (DOUT)
ACT
1 0 0 0
Activation running.
UIC is powered-up and the activation procedure is running.
RDS
0 1 1 1
Running Digital Sum.
Given during activation procedure. The receiver has reached synchronization.
CT
1 1 0 0
Connection Through.
Layer 1 activation procedure has been completed. B and D channels are
transparently connected.
DEAC
0 0 0 1
Deactivation running.
UIC is deactivating in response of a DEAC, RES or LTD command.
DC
1 1 1 1
Deactivation confirmation.
UIC has completed the deactivation procedure.
RSYN
0 1 0 0
Resynchronization.
The receiver has lost framing and is attempting to resynchronize.
HI
0 0 1 1
High Impedance.
When pin PFOFF is HIGH indication HI is output and UIC starts transmitting
INFO U0. Normally used to indicate that remote feeding has been switched off.
STU2071
11/18


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