txc-03456 TranSwitch Corporation, txc-03456 Datasheet - Page 13

• Manufacturer Part Number: txc-03456
• Description: Device Level Mapper
• Manufacturer: TranSwitch Corporation

RECEIVE DESYNCHRONIZER
Symbol
STUFF
PLEQ0
CTRL
CTRL
PJ
NJ
Pin No.
143
14
15
20
72
13
I/O/P
O
O
O
O
O
O
CMOS4mA Phase Detector Output Positive: Normally connected to low
CMOS4mA Phase Detector Output Negative: Normally connected to low
TTL4mA
TTL4mA
TTL4mA
TTL4mA
Type
pass filter as part of the desynchronizer phase-locked loop.
See Figure 25.
pass filter as part of the desynchronizer phase-locked loop.
See Figure 25.
Stuff (Justification) Opportunity Indication: This lead pro-
vides a status of the stuff (justification) S-bit in the Z byte for
each row in the nine subframes in the 140 Mbit/s SDH/SONET
format. The pin is high for one SONET/SDH row when there is
a stuff indication, and low when this bit is information. The out-
put on this pin is updated each row based on majority voting of
the five c-bits.
Positive Justification Indication: This lead provides a posi-
tive pulse when a positive pointer movement is detected. The
pulse width is one DCLK cycle wide.
Negative Justification Indication: This lead provides a posi-
tive pulse when a negative pointer movement is detected. The
pulse width is one DCLK cycle wide.
Pointer Leak Counter Equal to Zero Indication: This lead
provides a positive indication when the internal pointer leak
counter is equal to zero. This signal is reset to zero when the
internal counter is preset. A positive pulse, one DCLK cycle
wide, is then output for each time a bit is leaked out of the
L4M’s Desynchronizer. The last bit leaked out is represented
by the last rising edge of the PLEQ0 signal lead.
DATA SHEET
- 13 -
Name/Function
Ed. 1A, January 2000
TXC-03456
TXC-03456-MB
L4M