peb2255 Infineon Technologies Corporation, peb2255 Datasheet - Page 100

• Manufacturer Part Number: peb2255
• Description: E1/t1/j1 Framer And Line Interface Component For Long And Short Haul Applications
• Manufacturer: Infineon Technologies Corporation

4.6.5
Each of the 32 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
disturbs 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 30
Data Sheet
RL1
RL2
XL1
XL2
Single Channel Loop Back
Single Channel Loopback (E1)
Clock +
Data
Recovery
Trans.
Framer
RCLK
Rec.
Framer
MUX
100
IDLE Code
MUX
Functional Description E1
Elast.
Store
Elast.
Store
FALC-LH V1.3
ITS09747
PEB 2255
RDO
XDI
2000-07