PEB22554 SIEMENS [Siemens Semiconductor Group], PEB22554 Datasheet - Page 79

• Manufacturer Part Number: PEB22554
• Description: ICs for Communications
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

PEB 22554
Functional Description E1
the QuadFALC (framing, CRC, Sa/Si bit signaling, remote alarm) will be ignored. With
register TSWM the Si-bits, A-bit or the Sa4-8 bits could be selectively enabled to send
data transparent from port XDI to the far end. For complete transparency the internal
signaling controller, IDLE code generation and AIS alarm generation, single channel and
payload loop back has to be disabled.
Pseudo-Random Bit Sequence Generation and Monitor
15
20
The QuadFALC has the added ability to generate and monitor 2
-1 and 2
-1 pseudo-
random bit sequences (PRBS). The generated PRBS pattern will be transmitted
optionally inverted or not to the remote end via pins XL1/2 resp. XDOP/N. Generating
and monitoring of PRBS pattern is done according to ITU-T O. 151.
The PRBS monitor senses the PRBS pattern in the incoming data stream.
Synchronization is done on the inverted and non inverted PRBS pattern. The current
synchronization status is reported in status and interrupt status registers. Enabled by bit
LCR1.EPRM each PRBS bit error will increment
an error counter (CEC2).
Synchronization will be reached within 400 msec with a probability of 99.9% and a BER
of 1/10.
Semiconductor Group
79
09.98