PEB24911HV13 Lantiq, PEB24911HV13 Datasheet - Page 60

• Manufacturer Part Number: PEB24911HV13
• Manufacturer: Lantiq

Specifications of PEB24911HV13

• Lead Free Status / Rohs Status: Supplier Unconfirmed

PEF 24911
Functional Description
3.11
Cyclic Redundancy Check
An error monitoring function is implemented covering the 2B + D and M4 data
transmission of a U-superframe by a Cyclic Redundancy Check (CRC).
The computed polynomial is:
12
11
3
2
G (u) = u
+ u
+ u
+ u
+ u + 1
(+ modulo 2 addition)
The check digits (CRC bits CRC1, CRC2, …, CRC12) generated are transmitted in the
U-superframe. The receiver will compute the CRC of the received 2B + D and M4 data
and compare it with the received CRC-bits generated by the transmitter.
A CRC-error will be indicated to both sides of the U-interface, as a NEBE (Near-end
Block Error) on the side where the error is detected, as a FEBE (Far-end Block Error) on
the remote side. The FEBE-bit will be placed in the next available U-superframe
transmitted to the originator.
Far-end or near-end error indications increment the corresponding block error counters
of exchange and terminal side.
Figure 24
illustrates the CRC-process.
Data Sheet
50
2001-07-16