PEF22558EV11GXP Lantiq, PEF22558EV11GXP Datasheet - Page 53

• Manufacturer Part Number: PEF22558EV11GXP
• Manufacturer: Lantiq

Specifications of PEF22558EV11GXP

• Screening Level: Industrial
• Mounting: Surface Mount
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Lead Free Status / RoHS Status: Compliant

12
12.1
Different PRBS modes which are using different bits and time slots in a E1/T1/J1 frame
can be selected, see
In the so called “unframed” mode all bits of all slots in a E1/T1/J1 frame are used for
PRBS.
In the so called “framed” mode the frame byte (time slot 0) of an E1 frame or the frame
bit in a T1/J1 frame is not used for PRBS respectively.
Selection of the PRBS modes “unframed” and “framed”is done by TPC0.PRM = ´00b´
and TPC0.FRA.
For TPC0.PRM not ´00b´, each time slot of an E1/T1/J1 signal can be selected indiviually
to send and receive a PRBS signal. Selection is done by the registers PRBSTS1 to
PRBSTS4. Here the used time slot numbers are the same as used normally for
numbering of the time slots:
-In E1 frames time slot 0 (TS0) up to time slot 31 (TS31), were TS0 is the frame byte
(time slot number 0 indicates the frame byte).
-In T1/J1 frames the time slot number 0 indicates the frame bit and the time slot numbers
1 up to 24 indicates the TS1 up to TS24.
If a time slot is used or not for PRBS sending and reception is controlled by the registers
PRBSTS1..4. The number of used time slots for PRBS is so called as “N”. The range of
N is 1, ..., 32 for E1 and 1, ..., 25 for T1/J1 (if no channel translation mode is selected)
because of the frame bit. The time slot selection 0 up to 31 for E1 or 0 up to 24 for T1/J1
(if no channel translation mode is selected) by PBBSTS(1:4) is common for all eight ports
respectively.
If channel translation mode is selected, the time slot numbers are the same as used in
the ordering of the active time slots at the system interface (0, ..., 31), see also table 31
of QuadFALC
The N multiple time slots are selected arbitrarily for PRBS. The PRBS data stream has
to be written into or read from the time slots consecutive respectively.
The selected time slot numbers are related to the mapping used on the system interface.
Note that deselection of time slot 0 (PRBSTS1.TS0 = ´0´) perfomes a “framed” mode for
E1/T1/J1.
For TPC0.PRM not ´00b´, normally all eight bits of the time slots are used for PRBS
(“N
are selected for PRBS can be optionally used for PRBS to avoid CAS disturbance
(“N
for PRBS. Setting of this mode is performed by setting the register bits TPC0.PRM(1:0)
Delta Sheet
64 kbit/s”). To allow CAS-BR in T1 mode, only 7 MSBs of the all time slots which
56 kbit/s”), the eight´s bit of all time slots (which is the CAS bit in T1) is not used
Test and Maintenance
PRBS Test Signal
®
data sheet.
Table
22.
53
Test and Maintenance
Rev. 2.0, 2005-05-03
OctalFALC
PEF 22558 E
TM