PEB22554 SIEMENS [Siemens Semiconductor Group], PEB22554 Datasheet - Page 266
PEB22554
Manufacturer Part Number
PEB22554
Description
ICs for Communications
Manufacturer
SIEMENS [Siemens Semiconductor Group]
Datasheet
1.PEB22554.pdf
(397 pages)
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Single Channel Loop (loopback of time-slots)
The channel loopback is selected via LOOP.ECLB = 1.
Each of the 24 time-slots may be selected for loopback from the system PCM input (XDI)
to the system PCM output (RDO). This loopback is programmed for one time-slot at a
time selected by register LOOP. During loopback, an idle channel code programmed in
register IDLE is transmitted to the remote end in the corresponding PCM route time-slot.
For the time-slot test, sending sequences of test patterns like a 1 kHz check signal
should be avoided. Otherwise, an increased occurrence of slips in the tested time-slot
will disturb testing. These slips do not influence the other time-slots and the function of
the receive memory. The usage of a quasi-static test pattern is recommended.
Figure 68
Channel Loopback
Semiconductor Group
RL1
RL2
XL1
XL2
Clock +
Data
Recovery
Trans.
Framer
RCLK
Rec.
Framer
MUX
266
IDLE Code
MUX
Functional Description T1 / J1
Elast.
Store
Elast.
Store
PEB 22554
ITS09747
RDO
XDI
09.98
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