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STU2071 View Datasheet(PDF) - STMicroelectronics

Part Name
Description
Manufacturer
STU2071
ST-Microelectronics
STMicroelectronics ST-Microelectronics
STU2071 Datasheet PDF : 18 Pages
First Prev 11 12 13 14 15 16 17 18
STU2071
LT mode COMMANDS (DIN)
ACT
1000
AL
1001
L2
1010
LTD
0011
DEAC
0000
RES
1101
SSP
0101
L4
1011
LT mode INDICATION (DOUT)
ACT
1000
RDS
0111
CT
1100
DEAC
DC
RSYN
HI
0001
1111
0100
0011
Activate.
UIC is set in power-up state, executing the complete activation of Layer 1. The
transparent channel transmission is enabled.
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.
Loop 2.
Command to close Loop 2 in NT.
Line Transmission Disabled.
UIC stops transmitting signals on the line and is powered down.
Deactivate.
Request to deactivate UK0.
Reset.
Reset the UIC to the initial state.
Send Single Pulse.
The UIC transmits single pulse at 1 ms time intervals with alternate polarity.
Repeter loop
Activation running.
UIC is powered-up and the activation procedure is running.
Running Digital Sum.
Given during activation procedure. The receiver has reached synchronization.
Connection Through.
Layer 1 activation procedure has been completed. B and D channels are
transparently connected.
Deactivation running.
UIC is deactivating in response of a DEAC, RES or LTD command.
Deactivation confirmation.
UIC has completed the deactivation procedure.
Resynchronization.
The receiver has lost framing and is attempting to resynchronize.
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.
POWER DOWN STATE
Power consumption of most functions is reduced;
module interface is not active; C/I messages can-
not be exchanged.
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.
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.
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.
11/18
 

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