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SONET/SDH Configuration and Testing
Modifying the Value of the Payload Pointer
4
4-17
Table 4-3. Description of STS-3c/STM-1 Errors (cont)
Errors
Description
Path FEBE: TX1-TX8
Pressing ENTER forces the transmitted
PATH FEBE
indicator
to indicate a
Far End Block Error
. Each time ENTER is
pressed another FEBE indication is sent.
The Right or Left Arrow key can be used to change the TX1
setting to TX2…TX8. Each of these selections represents an
increase in the number of transmitted FEBE indications that
can be sent with each press of the ENTER key (for example,
selecting TX4 results in the transmission of four FEBE
indications every time you press ENTER).
Modifying the Value of the Payload Pointer
Both the SONET and SDH transmit overhead contains a payload pointer, which is
used to determine where the beginning of the
Synchronous Payload Envelope
(SPE) is located. The starting location of the SPE within the frame may change in
order to respond to small frequency differences among various elements in a
communications network. For this reason, you may need to modify the value of
the payload pointer to determine the location of the first byte of the SPE. This
pointer can take on any value from 0 to 782 decimal. It represents the offset from
the start of the frame required to locate the SPE.
To change the value of the payload pointer, follow these steps:
1.
Press the
SONET
key. The
SONET SELECTIONS
menu is displayed.
2.
Press the
Down Arrow
key to move the
Pointer Actions
option to the selection
line:
SONET SELECTIONS
Setup STS-3c
Pointer Actions
Loopback STS-3c OFF
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