pef22504 Infineon Technologies Corporation, pef22504 Datasheet - Page 112

• 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

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, see also
If ALS.LILS is set (ALS), 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´. 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´ the remote loop is still active,
because automatic loop switching is logically OR´d 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.) was 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.) was detected from the system side. (But if the local loop is additionally
activated by LIM0.LL = ´1´ the local loop is still active, because automatic loop switching is logically OR´d with the
appropriate loop switching by register bits.).
ALS.SILS and ALS.LILS both must not be set to ´1´ simultaneous.
If ALS.SILS or ALS.LILS are set after an In-Band loop code was 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 kind of detected In-Band loop codes is shown in the interrupt status register bits ISR6.(3:0).
To avoid deadlocks in the QuadLIU
local loop (see
3.11.3
In the remote loop-back mode the clock and data recovered from the line inputs RL1/2 or ROID are routed back
to the line outputs XL1/2 or XOID through the analog or digital transmitter, see
normal mode they are also sent to the framer interface. The remote loop-back mode is activated by
•
•
Received data can be looped with or without the jitter attenuator (JATT buffer) dependent on LIM1.JATT (LIM1).
Figure 43
Data Sheet
Control bit LIM1.RL or
After detection of the appropriate In-band loop code, if enabled by ALS.LILS and if LIM0.LL = ´0´ (LIM0) (to
avoid deadlocks), see
Transmit Line
Interface
Receive Line
Interface
RL1/ROID
XL1/XOID
RL2
XL2
Remote Loop
Remote Loop
Chapter
Equalizer
3.11.4) is closed (LIM0.LL is set).
Chapter
TM
3.11.2.
Figure
DAC
an activation of the remote loop is not possible by In-band loop codes if the
38.
Shaper,
Pulse
LBO
Recovery
Clock &
Data
DPLL
112
Buffer
JATT
Decoder
Encoder
Figure 43
clocking
Functional Description
Q LIU _rem ote_loop
Rev. 1.3, 2006-01-25
and
Figure
QuadLIU
PEF 22504
RDATA
XDATA
38. As in
TM