Internal Sdh Transmitter Clock (Options Us1, [Us5], A1T, [A1U], A3R [A3S]); Specification; Description; Equipment Required - HP 37717C Calibration Manual

Performance Tests
Internal SDH Transmitter Clock (Options US1, [US5], A1T, [A1U], A3R
[A3S])
Internal SDH Transmitter Clock (Options US1, [US5],
A1T, [A1U], A3R [A3S])
Specification
Bit Rate Accuracy
155.52 Mb/s

Description

The test uses a Frequency Counter connected to the SDH Signal Out port to measure
the STM-1 All Ones data rate. This gives an indirect measure of the transmitter
clock frequency as the data is clocked by the internal 10MHz clock oscillator. The
test limits assume the instrument is within the annual calibration cycle. The STM-1
Framing is disabled for this test using the MODULE DEBUG function of the HP
37717C.

Equipment Required

Frequency Counter
75 Termination
T Connector

Procedure

1. Recall the HP 37717C DEFAULT SETTINGS as shown on 3-2.
2. Connect the HP 37717C STM-1 OUT port to the Frequency Counter Input A,
terminated in 75 (use the T Connector).
4.5 ppm
: HP 5335A Option 010
: HP 15522-80010
: HP 1250-0781
3-77