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Design Guidelines for TERIDIAN 78P235x LIUs
Eye Diagram
The Eye Diagram provides a longer-term view of the signal, taking into account the relative time position of
successive pulses. It provides less information about pulse shape but allows a more thorough analysis of the
cumulative effects of wander and jitter. Eye diagrams require the use of DPO mode or other long-term persistence
method to preserve information from the preceding pulses then overlaying them in a continuous fashion. The
timing and pulse width variations are then displayed as a widening of the eye diagram’s traces, which must
remain within the template to meet specification.
“Maximum Eye Diagram” @ 0ft
and
“Small Eye Diagram” @ 225ft
A few words about transmit timing modes in the 78P235x
The 78P235x LIUs use delay lock loop (DLL) technology to track the incoming data and recovery timing. In the
78P235x, there are two different modes in which the integrated CDR is used to recovery the transmit clock. This
section will describe both and their effects on CMI pulse mask testing.
Most transmit timing modes of the 78P235x are synchronous (re-timing) modes where a system reference
clock is provided to the LIU that is source synchronous with the timing of the transmit data source (i.e. SDH
Overhead Processor), E4 Mapper). In this mode of operation, the transmit output is re-timed to eliminate any jitter
caused by clock recovery or serialization.
For application where only data is available at the system (NRZ) interface, a plesiochronous transmit timing
mode is available. In this mode, the recovered transmit clock is used for CMI encoding and pulse shaping.
System Reference
+/- 20ppm for STM1
+/- 15ppm for E4
235x Transmit - Synchronous (re-timing) modes
622 MHz
PLL / VCO
Div/2
TX DATA OUT
Tx Data In
BW ~ 1 MHz
DLL
D
CK
FIFO
De-coupled Tx output exhibits lower phase
jitter due to re-timing with FIFO
+/- 70ppm or better
XO
235x Transmit - Plesiochronous mode
622 MHz
PLL / VCO
BW ~ 1 MHz
Div/2
DLL
TX DATA OUT
Tx Data In
?
?
?
BW = 80 kHz
32 phase taps (100ps )
Direct coupled Tx output will exhibit
high freq. phase jitter
Page 14 of 15
? 2008 Teridian Semiconductor Corp.
Rev 2.1
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相关PDF资料
79-WHITE-1"X60YD TAPE GLASS CLOTH 1"X 60YD WHT
79059-2701 CONN RECEPT R/A 50POS 4-40 SCSI
79059-2702 CONN RECEPT R/A 68POS 4-40 SCSI
79059-2726 CONN RECEPT R/A 50POS 2-56 SCSI
79278 TAPE CLR ESD YEL STRIPE 2"X72YDS
796014-2 CONN CHAMP GUIDE PIN .050
796055-2 CONN RCPT 68POS .8MM R/A
796068-1 CONN RCPT 40POS .050 VERT
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