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78P2344-IGT Datasheet(PDF) 3 Page - Teridian Semiconductor Corporation |
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78P2344-IGT Datasheet(HTML) 3 Page - Teridian Semiconductor Corporation |
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3 / 37 page  78P2344JAT 4-port E3/DS3/STS-1 LIU with Jitter Attenuator Page 3 of 37 2005 Teridian Semiconductor Corporation Rev 2.2 LOCAL LOOPBACK AND REDUNDANCY MUX Each receiver has a 4-input MUX as shown in the adjacent figure. In multiport applications where redundant channels are required, the receiver MUX can be configured to provide the necessary multiplexing functions. This allows the user to use one port as a redundant monitor for the other port. The tables below show the register settings for selecting the desired receiver input source. LLBKA (Port 1) LLBKB (Port 1) Receiver #1 Input Source 0 0 LINP1/LINN1 0 1 LOUTP1/LOUTN1 1 0 LINP2/LINN2 1 1 LOUTP2/LOUTN2 LLBKA (Port 2) LLBKB (Port 2) Receiver #2 Input Source 0 0 LINP2/LINN2 0 1 LOUTP2/LOUTN2 1 0 LINP1/LINN1 1 1 LOUTP1/LOUTN1 LLBKA (Port 3) LLBKB (Port 3) Receiver #3 Input Source 0 0 LINP3/LINN3 0 1 LOUTP3/LOUTN3 1 0 LINP4/LINN4 1 1 LOUTP4/LOUTN4 LLBKA (Port 4) LLBKB (Port 4) Receiver #4 Input Source 0 0 LINP4/LINN4 0 1 LOUTP4/LOUTN4 1 0 LINP3/LINN3 1 1 LOUTP3/LOUTN3 Note: The LLBKA and LLBKB bits are located in the Mode Control Register (MDCR). The Register Control bit, REGEN, should be enabled when using the register settings to avoid conflict with external loopback setting pins. Transmitter #1 Receiver #1 00 01 10 11 Transmitter #2 Receiver #2 00 01 10 11 Transmitter #3 Receiver #3 00 01 10 11 Transmitter #4 Receiver #4 00 01 10 11 LOUTP1, LOUTN1 LINP1, LINN1 LOUTP2, LOUTN2 LINP2, LINN2 LOUTP3, LOUTN3 LINP3, LINN3 LOUTP4, LOUTN4 LINP4, LINN4 LLBKA,B(1) LLBKA,B(2) LLBKA,B(3) LLBKA,B(4) When serial interface control is not available, the respective LPBKx pin for each of the channels can also be used to activate local loopback mode as shown below. Note that redundant channel modes can only be activated using the serial interface. LPBKx pin Loopback Mode L Normal Operation Same as LLBKA,B = ‘00’ Z Remote (Digital) Loopback Same as RLBK = ‘1’ H Local (Analog) Loopback Same as LLBKA,B = ‘01’ |
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