pef22504 Infineon Technologies Corporation, pef22504 Datasheet - Page 91

• 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

In the first (“non-generic”) application only the analog switch is used. These switch is ´on´ in the active and ´off´ in
the stand-by channel. The 300
´0´). Also the transmit interface works in a non-generic mode (see
both channels is always ´0´. The configuration (additional to that of
Table 20
120
110
100
75
In the generic redundancy application different line impedances Z
Additionally to the the analog switch the 300
line impedances Z
impedance is 75
Also the transmit interface works in a generic mode (see
channels.
The configuration (additional to that of
Table 21
120
110
100
75
Table 22
Table 22
Channel
Active channel
Stand-by channel
3.7.4
There are different definitions for detecting Loss-Of-Signal (LOS) alarms in the ITU-T G.775 and ETS 300233. The
QuadLIU
and activating a status bit. Additionally a LOS status change interrupt is programmable by using register GCR.SCI.
•
Data Sheet
Line Impedance Z
Line Impedance Z
Detection: An alarm is generated if the incoming data stream has no pulses (no transitions) for a certain
number (N) of consecutive pulse periods. A pulse with an amplitude less than Q dB below nominal is the criteria
for “no pulse” in the analog receive interface (LIM1.DRS = ´0´) (LIM1). The receive signal level Q is
programmable by three control bits LIM1.RIL(2:0) see
(PCD). The contents of the PCD register is multiplied by 16, which results in the number of pulse periods, i.e.
the time which has to suspend until the alarm has to be detected. The programmable range is 16 to 4096 pulse
TM
illustrates the switching in the receive path used in the “generic” redundancy application:
[Ohm]
[Ohm]
covers all these standards. The LOS indication is performed by generating an interrupt (if not masked)
Configuration for “non-generic” Redundancy Applications, Switching with only one Board
Signal
Configuration for “generic” Redundancy Applications, Switching with only one Board Signal
Switching in “Generic” Redundancy Application
Loss-of-Signal Detection
0
and ´off´ otherwise. In the stand-by channel this switch is always óff´, see
(register bit LIM2.MPAS of both channels). In the active channel this switch is ´on´ if the line
Off, if Z
On, if Z
Off
0
0
95
70
95
0
0
is 120
is 75
switch is unused (always ´off´, register bit LIM2.MPAS of both channels is always
R
R
S
S
[Ohm]
[Ohm]
Table
(LIM2.MPAS = ´1´)
,110
300 Ohm Switch
19) is shown in
or 100
switch is used to match the termination resistance to the different
5.5 or 0, see
Table 28
0
R
R
SER
SER
91
(GPC1.MPAS = ´0´)
Chapter
Table
[Ohm]
[Ohm]
Table
56. The number N can be set by an 8-bit register
3.9.1) using the register bit PC6.TSRE of both
Chapter
Table
21:
0
can be used without changing the board.
0
0
1
19) is shown in
LIM2.MPAS
LIM2.MPAS
3.9.1): The register bit PC6.TSRE of
On
Off
Analog Switch
Functional Description
Table
Rev. 1.3, 2006-01-25
0
See
Table
20:
PC6.TSRE
PC6.TSRE
Table 28
QuadLIU
PEF 22504
22.
TM