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| 78P2244 Quad E3/DS3/STS-1 Transceiver Advanced Product Notice June 2000 DESCRIPTION The 78P2244 is a quad channel version of the 78P2241. Each of the four channels is a complete line interface transceiver for E3, DS3, STS-1, North America T3 and ATM applications. Each channel includes clock recovery and transmitter pulse shaping functions for applications using 75-ohm coaxial cable at distances up to 1100 feet. These applications include DSLAMs, T3/E3 digital multiplexers, SONET Add/Drop multiplexers, PDH equipment, DS3 to Fiber optic and microwave modems and ATM WAN access for routers and switches. Each receiver recovers clock and data from a B3ZS or HDB3-coded AMI signal. The receiver can compensate for over 12dB of cable and 6dB of flat loss. Each transmitter has the B3ZS/HDB3 ENDEC with a receive line code violation detector, a loop-back mode, a clock polarity selection mode, and the ability to receive a DSX3 monitor signal. Signals generated meet the standard pulse shape requirements. The 78P2244 is manufactured in an advanced BiCMOS process and operates at both 3.3V and 5V power supply voltages. BLOCK DIAGRAM FEATURES * * * Quad channel transmit and receive interface for E3, DS3 and STS-1 applications Interfaces to 75 ohm coaxial cable over 1100 feet at speeds up to 51.84 Mbit/s Compliant with ANSI T1.102-1993, Telcordia GR-499-CORE and GR-253-CORE, ITU-T G.703, G.823 and G.824 for jitter tolerance and G.775 for loss of signal Compliant with ATM FORUM af-phy-0034 (E3 public UNI) and af-phy-0054 (DS3 public UNI) Easily Interfaced to ATM framer ICs such as PMC-Sierra 7345 , and 7346 QJET Receive DS3-high and DSX3 monitor signals Diagnostic loop-back for AMI and digital signals Selectable B3ZS/HDB3 ENDEC Receive Line Code Violation Detector 128-lead TQFP package 3.3V or 5V operation Input circuit works transformer or AC coupled * * * * * * * * * Signal from Adjacent Port DLPBK ENDEC TPOS/TNRZ TNEG TCLK B3ZS/ HDB3 Encoder ENDEC PULSE SHAPER TXEN LBO LOUTP LOUTN RPOS/RNRZ RNEG/RLCV B3ZS/ HDB3 Decoder Data Slicer Adaptiv e Equalizer Clock Reco ver y Signal Detector LINP LINN RCLK PWDN Biasing LF RXLPBK LOS MON Port 1 Port 2 Port 3 Port 4 78P2244 Quad E3/DS3/STS-1 Transceiver FUNCTIONAL DESCRIPTION The 78P2244 contains all the necessary transmit and receive circuitry for connection between E3, DS3, or STS-1 signals and digital Framer/Deframer ICs. Operating Rate The DS3 and E3 pins determine which mode the chip operates in according to the table below. They control the PLL center frequency, the equalizer response, the transmitter pulse shape, and the transmitter amplitude. Standard E3 DS3 STS-1 STS-1 DS3 PIN Low High Low High E3 PIN High Low Low High The decoder also detects Receive Line Code Violations (RLCV) and outputs a pulse via the RNEG/RLCV pin. Three different classes of line code violations are detected. 1) 2) Too many zeros: More than two (three) consecutive zeros in B3ZS (HDB3) mode. Not enough zeros between bipolar pulse (B) and bipolar violation pulse (V): (B,V) for B3ZS. (B,V) or (B,0,V) for HDB3. Code violation: Even number of bipolar pulses (B) detected between bipolar violation pulses (V). 3) B3ZS/HDB3 ENDEC WITH LINE CODE VIOLATION DETECT The 78P2244 includes a selectable B3ZS/HDB3 Encoder/Decoder (ENDEC). When the ENDEC pin is low, the ENDEC is selected and the decoder generates a composite NRZ logic data stream following the B3ZS (for DS3/STS-1) or HDB3 (for E3) substitution codes via the RPOS/RNRZ pin as shown below. ENDEC High Low RPOS/RNRZ Positive AMI NRZ data RNEG/RLCV Negative AMI Receive Line Code Violation Indicator On the transmit side, when the ENDEC pin is low, NRZ input data is encoded to Positive and Negative logic data following the B3ZS (for DS3/STS-1) or HDB3 (for E3) substitution codes. The NRZ data is input to the TPOS/TNRZ pin as shown below. ENDEC High Low TPOS/TNRZ Positive AMI NRZ data TNEG Negative AMI No Connect No responsibility is assumed by TDK Semiconductor Corporation for use of this product nor for any infringements of patents and trademarks or other rights of third parties resulting from its use. No license is granted under any patents, patent rights or trademarks of TDK Semiconductor Corporation and the company reserves the right to make changes in specifications at any time without notice. Accordingly, the reader is cautioned to verify that the data sheet is current before placing orders. TDK Semiconductor Corporation, 2642 Michelle Drive, Tustin, CA 92780-7019, (714) 508-8800, FAX: (714) 508-8877 (c)2000 TDK Semiconductor Corporation 06/06/00- rev. A 2 |
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