PEB24911HV13 Lantiq, PEB24911HV13 Datasheet - Page 107

• Manufacturer Part Number: PEB24911HV13
• Manufacturer: Lantiq

Specifications of PEB24911HV13

• Lead Free Status / Rohs Status: Supplier Unconfirmed

4.4.2
For bit error rate monitoring the DFE-Q V2.1 features a 16-bit Bit Error Rate counter
(BERC) per line. The function is channel selective. The user can direct that the
measurement is performed only for the B1 or for the B2 or for the B1-, B2- and the D-
channel. Prerequisite is that the corresponding loop #2 of the addressed channel(s) has
been closed on the NT side before by an EOC command.
Operation:
• The respective loopback command has to be transmitted to the NT (EOC message
• The system sets the respective channel to ’all zeros’.
• The respective lineport is adressed by setting the LP_SEL register.
• The BERC counter is reset to ’0000’ by reading register BERC.
• The BERC counter can be started after some time (full round trip delay) by selecting
• The BERC is stopped by setting TEST.BER to ’00’.
• The number of bit errors (received ’1’s) can be read in register BERC.
• The system can enable the tested channel again.
4.4.3
The DFE-Q V2.1 provides internal counters for far-end and near-end block errors. This
allows a comfortable surveillance of the transmission quality on the U-interface. In
addition MON-messages indicate the occurrence of near-end errors, far-end errors and
the simultaneous occurrence of both error types.
A block error is detected each time when the calculated checksum of the received data
does not correspond to the control checksum transmitted in the successive superframe.
One block error thus indicates that one U-superframe has not been transmitted correctly.
No conclusion with respect to the number of bit errors is therefore possible.
The following two sections describe the operation of near and far-end block error
counters as well as the commands available to test them.
4.4.3.1
A near-end block error (NEBE) indicates that the error has been detected in the receive
direction (i.e. NEBE = NT => LT error). Each detected NEBE-error increments the 8-bit
NEBE-counter. The NEBE counter stops at its maximum value FF
overflow.
The current value of the NEBE counter can be read by the MON-8-command RBEN. The
response comprises two bytes: the first byte always indicates that a MON-8-message is
replied (80
operation resets the counter to (00
Data Sheet
LBBD, LB1, or LB2).
the channel (s) to be checked in bits TEST.BER.
H
Bit Error Rate Counter
Block Error Counters
Near-End and Far-End Block Error Counter
), the second represents the counter value (00
H
).
97
Operational Description
H
) … (FF
H
H
and does not
). Each read
PEF 24911
2001-07-16