Sdh/Sonet Frequency Offsets; Specifications; Description; Equipment Required - HP 37718A Installation And Verification Manual

Performance Tests

SDH/SONET Frequency Offsets

SDH/SONET Frequency Offsets
Specifications

Description

The test uses a Frequency Counter connected to the Multirate Analyzer
module Clock Trigger output port. This output is derived from the Clock
module and is directly related to the SDH/SONET output rate. An
external 10 MHz reference from a Signal Generator is used to clock the
HP 37718A/19A and also provides a timebase reference for the
Frequency counter. The counter measures the Clock Trigger frequency to
check the offset accuracy and range.

Equipment Required

Signal Generator
Frequency Counter
T Connector

Procedure

1 Recall the HP 37718A/19A DEFAULT SETTINGS as shown on page 3-
4. Set the Transmitter Output to SDH/SONET.
2 Select CLOCK SYNC [10MHz REF] ON THE HP 37718A/19A
display.
TRANSMIT
3 Connect the HP8657A to the HP 37718A/19A Unbalanced 75
REF IN port on the Clock Module.
4 Set the Signal Generator frequency to 10.000MHz and amplitude to
+10dBm.
5 Check the Clock Loss Alarm Led is not lit.
3-64
±999 ppm
Range
Resolution 0.1 ppm
Accuracy 0.02 ppm
: HP 8657A
: HP 5335A Opt 010
: HP 1250-0781
Ω
2M