PM5345 S/UNI-155
DATA SHEET
PMC-930305
ISSUE 4
SATURN USER NETWORK INTERFACE
Pin Name Type
Pin
No.
Function
PAIS
Output 37
The path AIS (PAIS) signal is set high when
STS-path AIS is declared. This occurs when
an all ones pattern is observed in the pointer
bytes (H1, H2) for three consecutive frames.
Path AIS is removed when the same valid and
normal pointer is detected for three
consecutive frames or a legal pointer with an
active NDF is received. This alarm indication is
also available via register access. PAIS is
updated on the falling edge of RCLK.
PYEL
Output 39
The path yellow (PYEL) signal is set high when
STS-path yellow alarm is declared. This
occurs when bit 5 of the path status byte (G1)
is set high for ten consecutive frames. Path
yellow is removed when bit 5 of the G1 byte is
set low for ten consecutive frames. This alarm
indication is also available via register access.
PYEL is updated on the falling edge of RCLK.
TLAIS
Input
29
The active high transmit line alarm indication
(TLAIS) signal controls the insertion of line
AIS. Line AIS is inserted by overwriting the
SONET/SDH frame contents with all ones
(before scrambling). The section overhead is
not overwritten. This function can also be
performed via register access. Line AIS
insertion is internally synchronized to frame
boundaries. The TLAIS input takes
precedence over the TTOH and TTOHEN
inputs. TLAIS is sampled on the rising edge of
POCLK.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
23
PMC [ PMC-SIERRA, INC ]
