Datenblatt-Suchmaschine für elektronische Bauteile |
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STU2071 Datenblatt(PDF) 11 Page - STMicroelectronics |
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STU2071 Datenblatt(HTML) 11 Page - STMicroelectronics |
11 / 18 page 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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Ähnliche Beschreibung - STU2071 |
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