pef20550 Infineon Technologies Corporation, pef20550 Datasheet - Page 336

• Manufacturer Part Number: pef20550
• Description: Extended Line Card Interface Controller Elic
• Manufacturer: Infineon Technologies Corporation

Figure 114
Connection of Redundant PCM Transmission Lines to the ELIC
5.8.3
Usually the repetition rate of the applied framing pulse PFS is identical to the frame
period (125 s). If this is the case, the ’loss of synchronism indication function’ can be
used to supervise the clock and framing signals for missing or additional clock cycles.
The ELIC internally checks the PFS period against the duration expected from the
programmed clock rate. The clock rate corresponds to the frequency applied to the PDC
pin. The number of clock cycles received within one PFS period is compared with the
values programmed to PBNR (number of bits per frame) and PMOD:PCR (single/double
clock rate operation). If for example single clock rate operation with 24 timeslots per
frame is programmed, the ELIC expects 192 clock cycles within one PFS period. The
synchronous state is reached after the ELIC has detected two consecutive correct
frames. The synchronous state is lost if one erroneous frame is found. The
Semiconductor Group
EPIC
OUT0
TSC0
IN0
PMOD AIS0
ISTA PIM
R
PCM Framing Supervision
:
:
Logical Ports
=1
1
0
Physical Pins:
TXD0
TSC0
RXD0
RXD1
TSC1
336
Line Drivers
& Receivers
®
Application Hints
PCM Transmission
Line #1
PCM Transmission
Line #2
PEB 20550
PEF 20550
ITD08094
01.96