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QuadFALC
TM
PEF 22554 E
Functional Description T1/J1
Data Sheet
196
Rev. 1.2, 2006-01-26
enabled through configuration register bits ALS.SILS (ALS_T) 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) will
be set to 1
B 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 status register bits RSP.LLBDD and RSP.LLBAD.
Detection and generation of In-Band Loop code is supported on line and system side independent from each other.
Framed and unframed In-Band loop code can be generated and detected.
Automatic loop switching is logically ORd with the appropriate loop switching by register bits.
If a remote loop is activated by an automatic loop switching the register bit LIM0.JATT controls also if the jitter
attenuator is active or not.
If ALS.LILS is set, the remote loop is activated after an activation In-Band loop code (see ANSI T1 404, chapter
9.4.1.1.) was detected from the line side and if the local loop is not activated by LIM0.LL = 1
B. The remote loop is
deactivated after a deactivation In-Band loop code (see ANSI T1 404, chapter 9.4.1.2.) was detected from the line
side. (But if the remote loop is additionally activated by LIM0.RL = 1
B the remote loop is still active, because
automatic loop switching is logically ORd with the appropriate loop switching by register bits.).
If ALS.SILS is set, the local loop is activated after an activation In-Band loop code (see ANSI T1 404, chapter
9.4.1.1.) is detected from the system side. The local loop is deactivated after a deactivation In-Band loop code
(see ANSI T1 404, chapter 9.4.1.2.) is detected from the system side. (But if the local loop is additionally activated
by LIM0.LL = 1
B the local loop is still active, because automatic loop switching is logically ORd with the appropriate
loop switching by register bits.).
ALS.SILS and ALS.LILS both must not be set to 1
B simultaneous.
If ALS.SILS or ALS.LILS are set after an In-Band loop code is detected, no automatic loop switching is performed.
If ALS.LILS is cleared, an automatic activated remote loop is deactivated.
If ALS.SILS is cleared, an automatic activated local loop is deactivated.
The detected type of In-Band loop code is indicated in the interrupt status register bits ISR6.(3:0).
To avoid lock up of the QuadFALC
TM an activation of the remote loop is not possible by In-band loop codes if the
5.5.8
Bit Oriented Messages (BOM): Generation, Detection and Loop Switching
(T1/J1)
The QuadFALC
TM performes the following functionalities regarding the Out-band loop codes (bit oriented
messages, BOM) on all four channels independent from each other:
Generation of Out-band loop codes (BOM) by setting of the appropriate DL-bits by the micro controller, see
Automatic loop switching (activation and deactivation, for remote loop, see Chapter 4.7.2 and payload loop,
Loop switching (“Out-band loop switching”) is possible by enabling of the BOM receiver 1 signaling (MODE.BRAC
= 1
B and CCR1.EITS = 1B) and detection of the following Out-Band loop messages related to ANSI-T1.403, 1999,
table4:
Table 60
Out-band Loop Messages for Loop Switching (T1/J1)
Function
Message (BOM Code)
Line loopback activate
00001110 11111111
B
Line loopback deactivate
00111000 11111111
B
Payload loopback activate
00010100 11111111
B
Payload loopback deactivate
00110010 11111111
B
Universal loopback deactivate
00100100 11111111
B