HP OMNIBER 718 37718A User Manual page 65

Selecting Test Features
Adding Pointer Adjustments
OFFSET - You can frequency offset the line rate or the SPE/VT rate,
relative to each other, thus producing pointer movements. If you offset
the SPE pointer, an 87:3 sequence of pointer movements is generated.
The available configurations are listed in the following table.
If you are currently adding Frequency Offset to the SONET interface
or payload, pointer OFFSET is not available.
Pointer Type
SPE Constant
SPE Offset
VT Constant
VT Offset
T1.105/GR-253 - Provides pointer movements according to T1.105 and
GR-253:
4 Choose the T1.105/GR-253 ADJUSTMENT TYPE.
5 Choose the POLARITY, INTERVAL and PATTERN (where applicable)
for the selected sequence.
6 Choose POINTER SEQUENCES
G.783 sequence and
T1.105/GR-253 Pointer Sequences Explained
In addition to the BURST, NEW POINTER and OFFSET pointer
movements described, the HP 37718A can also generate pointer
sequences (pointer movements) according to T1.105.03 and GR-253.
Before running a pointer sequence you can elect to run an initialization
sequence, followed by a cool down period, and then run the chosen
sequence. This is selected using the START INIT softkey shown in the
display on the previous page. Initialized pointer sequences are made up
of three periods: the Initialization Period, the Cool Down Period, and the
Sequence (Measurement) Period, an example is given in the following
figure:
Line Rate SPE Rate
Offset
Constant
Constant
Tracks Line Rate
START INIT
to stop the pointer sequences.
STOP INIT
VT Rate
Tracks AU Payload
Constant
Offset
Constant
to generate the selected
55