peb2255 Infineon Technologies Corporation, peb2255 Datasheet - Page 111

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

• Generation of control signals to synchronize the CRC checker and the receive elastic
If programmed and applicable to the selected multiframe format, CRC checking of the
incoming data stream is done by generating check bits for a CRC multiframe according
to the CRC 6 procedure (refer to ITU-T G.704). These bits are compared with those
check bits that are received during the next CRC multiframe. If there is at least one
mismatch, the CRC error counter (16 bit) is incremented.
5.1.11
The received bit stream is stored in the receive elastic buffer. The memory is organized
as a two-frame elastic buffer with a maximum size of 48
buffer can be configured independently for the receive and transmit direction.
Programming of the receive buffer size is done by SIC1.RBS1/0 :
• RBS1/0 = 00 : two frame buffer or 384 bits
• RBS1/0 = 01 : one frame buffer or 193 bits
• RBS1/0 = 10 : short buffer or 96 bits :
• RBS1/0 = 11 : Bypass of the receive elastic buffer
The functions of the receive elastic buffer are:
• Clock adaption between system clock (SCLKR) and internally generated route clock
• Compensation of input wander and jitter.
Data Sheet
buffer.
Maximum of wander amplitude (peak-to-peak): (1 UI = 648 ns )
System interface clocking rate: 8.192 MHz:
142 UI in channel translation mode 0
78 UI in channel translation mode 1
System interface clocking rate: 1.544 MHz:
max. wander: 126 UI
average delay after performing a slip: 1 frame or 193 bits
System interface clocking rate: 8.192 MHz:
Max. wander : 80 UI in channel translation mode 0
Max. wander : 50 UI in channel translation mode 1
System interface clocking rate: 1.544 MHz:
max. wander: 74 UI
average delay after performing a slip: 96 bits
System interface clocking rate: 8.192 MHz:
Max. wander : 28 UI in channel translation mode 0; channel translation mode 1 not
supported
System interface clocking rate: 1.544 MHz:
max. wander: 38 UI
average delay after performing a slip: 48 bits
(RCLK).
Receive Elastic Buffer (T1/J1)
111
Functional Description T1/J1
8 bit. The size of the elastic
FALC-LH V1.3
PEB 2255
2000-07