peb2255 Infineon Technologies Corporation, peb2255 Datasheet - Page 216

• Manufacturer Part Number: peb2255
• Description: E1/t1/j1 Framer And Line Interface Component For Long And Short Haul Applications
• Manufacturer: Infineon Technologies Corporation

Pulse Count Detection Register (Read/Write)
Value after RESET: 00
PCD7…0…
Pulse Count Recovery (Read/Write)
Value after RESET: 00
PCR7…0…
Data Sheet
PCD
PCR
PCD7
PCR7
7
7
A LOS alarm is detected if the incoming data stream has no
transitions for a programmable number T consecutive pulse
positions. The number T is programmable via the PCD register and
can be calculated as follows:
T= 16
The maximum time is: 256 x 16 x 488 ns = 2 ms. Every detected pulse
resets the internal pulse counter. The counter is clocked with the
receive clock RCLK.
A LOS alarm is cleared if a pulse density is detected in the received
bit stream. The number of pulses M which must occur in the
predefined PCD time interval is programmable via the PCR register
and can be calculated as follows:
M = N+1 ; with 0
The time interval starts with the first detected pulse transition. With
every received pulse a counter is incremented and the actual counter
is compared with the contents of PCR register. If the pulse number is
active. In this case the next detected pulse transition starts a new time
interval.
Pulse Count Detection
Pulse Count Recovery
the PCR value the LOS alarm is reset; otherwise the alarm stays
H
H
(N+1) ; with 0
N
255.
216
N
255.
FALC-LH V1.3
PCD0
PCR0
E1 Registers
0
0
PEB 2255
2000-07
(36)
(37)