pef22504 Infineon Technologies Corporation, pef22504 Datasheet - Page 111

• Manufacturer Part Number: pef22504
• Description: Quad E1/t1/j1 Line Interface Component For Long- And Short-haul Applications Pef 22504 E, Pef 22504 Ht, Version 2.1
• Manufacturer: Infineon Technologies Corporation

the pattern, for example once per second, using the ISR3.SEC interrupt. In case PRBSSTA.PRS(2:1) is unequal
´11
Because every bit error in the PRBS sequence increments the bit error counter BEC, no special status information
like “PRBS detected with errors” is given here.
Table 33
TPC0.PRP(1:0)
00
01
10
11
XX
XX
3.11.2
Detection and generation of In-band Loop code is supported by the QuadLIU
side independent from another. On the framer side it is only supported in single rail mode.
The QuadLIU
In-band signaling information.The so called loop-up code (for loop activation) and loop-down code (for loop
deactivation) are recognized.
The maximum allowed bit error rate within the loop codes can be up to 10
One “In-band loop sequence” consists of a bit sequence of 51200 consecutive bits. The In-band loop code
detection is based on the examination of such “In-band loop sequences”.
The following In-band loop code functionality is performed by the QuadLIU
•
•
•
•
•
Only unframed In-Band loop code can be generated and detected.
Automatic loop switching is logically OR´d with the appropriate loop switching by register bits.
Data Sheet
B
The necessary reception time of In-band loop codes until an automatic loop switching is performed is
configured for the system side by the register bits INBLDTR.INBLDT(1:0) (INBLDTR). Configuring for the line
side is done by INBLDTR.INBLDR(1:0). If for example INBLDTR.INBLDR(1:0) = ´00
loop sequences” (16 x 51200 bits) is selected for the line side.
The interrupt status register bits ISR6.(3:0) reflects the type of detected In-band loop code. Masking can be
done by IMR6(3:0). The status bits are set after one “In-band loop sequence” is detected (no dependency on
INBLDTR).
Transmission of In-Band loop codes is enabled by programming MR3.XLD/XLU in E1 mode or MR5.XLD/XLU
in T1/J1 mode. Transmission of codes is done by the QuadLIU
The QuadLIU
(LCR1.LLBP = ´1´) (LCR1). Programming of these patterns is done in registers LCR2 and LCR3 (LCR2). The
pattern length is individually programmable in length from 2 to 8 bits by LCR1.LAC(1:0) and LCR1.LDC(1:0).
A shorter pattern can be inplemented by configuring a repeating pattern in the LCR2 and LCR3.
Automatic loop switching (activation and deactivation, for remote loop, see
Chapter
defined in ANSI-T1.403, 1999 in chapter 9.4.1.1 and 9.4.1.2. respectively. Automatic loop switching must be
enabled through configuration register bits ALS.SILS for the In-Band Loop codes coming from the system side
and ALS.LILS for the In-Band Loop codes coming from the line side respectively. Masking of ISR6.(3:0) for
interrupt can be done by register bits IMR6.(3:0). The interrupt status register bits ISR6.(3:0) (ISR6) will be set
to ´1´ if an appropriate In-Band code were detected, independent if automatic loop switching is enabled.
(Because the controller knows if automatic loop switching is enabled, it knows if a loop is activated or not.)
Code detection status only for the line side is displayed in E1 mode in status register bits LSR2.LLBDD /
LLBAD and in T1/J1 mode in LSR1.LLBDD / LLBAD.
´, the interrupt mask bits should be cleared to return to normal operation.
3.11.4) based on In-band Loop codes can be done. Two kinds of line loop back (LLB) codes are
Supported PRBS Polynomials
In-Band Loop Generation, Detection and Loop Switching
TM
generates and detects unframed In-band codes where the complete data stream is used by the
TM
also offers the ability to generate and detect flexible In-band loop-up and loop-down patterns
TPC0.PRM
01 or 11
01 or 11
01 or 11
01 or 11
00
00
LCR1.LLBP
X
X
X
X
0
1
111
TM
Kind of Polynomial Comment
2
2
2
2
2
2
lasting for at least 5 seconds.
11
15
20
23
15
20
-1
-1
-1
-1
-1
-1
-2
TM
for proper detection of the loop codes.
TM
:
Chapter 3.11.3
on the line side and on the framer
Functional Description
b
´ a time of 16 “In-band
SW compatible to
QuadLIU
Rev. 1.3, 2006-01-25
and local loop, see
QuadLIU
PEF 22504
TM