Pendulum WM-10 User manual

Wandermeters
WM-10 & WM-11
Users Manual

II
4031 600 10001
Rev. 05 (February 2003)
This manual, in whole or in part, may not be copied without permission.
All product names are trademarks of their respective companies.
© 2000 Pendulum Instruments AB
All rights reserved. Printed in Sweden.

Table of Contents
EC DECLARATION OF CONFORMITY . . I-IV
1 Preface
Introduction ........................1-2
2 Safety Instructions
Introduction ........................2-2
Safety Precautions ..................2-2
Grounding .........................2-3
Power Switch.......................2-3
Disposal of Hazardous Material.........2-3
3 Preparations for Use
Unpacking Instructions ...............3-2
Installation .........................3-2
Orientation and Cooling ...............3-3
Connecting to a PC ..................3-3
Ethernet Connection (WM-11)..........3-4
4 Using the Controls
About This Chapter ..................4-2
Basic Controls ......................4-2
Rear Panel.........................4-6
Presentation Modes..................4-7
5 WanderView
Introduction ........................5-2
Installation .........................5-2
The WanderViewäScreen ............5-3
Graphs in WanderViewä..............5-9
Application Hints ...................5-11
Introduction to ADEV and MADEV .....5-12
6 Performance Check
General Information .................6-2
Preparations .......................6-2
Outputs ...........................6-2
Test of PC Connection ...............6-3
Front Panel Controls .................6-3
7 Preventive Maintenance
Calibration and Adjustment ............7-2
Backup Battery .....................7-2
8 Specifications
Technical Specification ...............8-2
Ordering Information .................8-6
9 Program Commands
Remote Control .....................9-2
Command Reference Guide ...........9-6
10 Index
11 Service
Sales and Service Office .............11-II
Guarantee Statement ...............11-III
III

EC DECLARATION OF CONFORMITY
Number: PQWM11200206
The undersigned, representing the following manufacturer:
Manufacturer: Pendulum Instruments AB
Karlsbodavägen 39, Box 20020
SE-161 02 Bromma, Sweden
Representative: Kali Rahman
Function: Quality Manager
herewith declares that the product:
Product Identification:
Product: Wandermeter
Brand: Pendulum
Model: WM-10, WM-11
Version: All models
Additional Information:
is in conformance with the EC Directive 89/336/EEC based on test results using harmonized
standards in accordance with Article 10(1) of the directive LVD-73/23/EEC.
Harmonized Standards Used:
Safety: EN 61010-1 (1990) + A1 (1992) + A2 (1995)
Safety Requirements for Electronic Measuring Apparatus.
EMC: EN 61326-1 (1997)
Electrical equipment for measurement, control and laboratory use - EMC
requirements.
EN 55022 (1994) + A1 (1995) + A2 (1997) Class B
Limits and methods for measurement of radio disturbance characteristics
of information technology equipment (ITE).
EN 61000-6-2 (1999)
EMC - generic standards - immunity for industrial environments.
The tests have been performed in a typical configuration.
Place: Bromma Date: 2002-06-03 Signature:
This Conformity is indicated by the symbol , i.e. “Conformité européenne”.
IV

Chapter 1
Preface

Introduction
A wander of the synchronization clock in digi-
tal communication networks can cause severe
transmission problems. Quality control of the
synchronization clock requires monitoring of
wander over a long period (hours or days) using
an ultra-stable clock as reference.
So far measurement of wander has involved
bulky, complex and very expensive instrumen-
tation. To be able to view the wander parame-
ters MTIE and TDEV specified in international
standards, external computers were needed.
Congratulations for choosing the Wandermeter
from Pendulum Instruments. The portable, very
accurate and easy-to-use solution for wander
measurements on sync clocks and encoded data
signals.
Applications
nWM-10
The WM-10 Wandermeter can be used for sev-
eral purposes:
1. Clock quality verification according to stan-
dards (ITU G811-813) for telephone network
operators.
2. Clock quality verification according to ITU
or ETSI standards for leasers of synchroniza-
tion services, e.g. other telephone operators.
3. Troubleshooting in SDH or PDH networks
when a node is suspected not to operate cor-
rectly.
4. Preventive (diagnostic) maintenance of local
exchange stations (SDH or PDH).
5. Troubleshooting in GSM networks that use
the E1 clock for synchronization.
nWM-11
The Wandermeter WM-11 can be used for the
same purposes as the WM-10 (see preceding
paragraph) but has also additional areas of ap-
plication:
1. Troubleshooting in SONET networks when a
node is suspected not to operate correctly.
2. Preventive (diagnostic) maintenance of local
exchange stations (SONET).
Product Key Features
nWM-10
The WM-10 Wandermeter has the following
features:
–Wandermeter for verifying 2.048 MHz
(sync clock) or 2.048 Mbit/s (HDB3 data)
in SDH-network nodes (ITU G811-813).
–Self-contained unit with built-in Rubidium
Reference and graphical display. Can be
left unattended for automatic measure-
ments, without a PC, for diagnostic and
troubleshooting measurements.
–Graphical presentation of TIE, MTIE and
TDEV. Comparison with standard masks.
–Very easy to use.
–Transportable.
–Self-adjusting internal reference when con-
nected to a stable reference, e.g. Cesium or
GPS-controlled Rubidium frequency stan-
dard.
nWM-11
The WM-11 Wandermeter can perform the
same tasks as the WM-10 (see preceding para-
graph) but has also additional features:
–Wandermeter for verifying 1.544 MHz
(sync clock) or 1.544 Mbit/s (HDB3 data)
in SONET network nodes.
1-2 Introduction
Preface

–Wandermeter for other customary frequen-
cies in data, video and frequency distribu-
tion systems:
4 kHz, 8 kHz, 15.750 kHz (NTSC),
15.625 kHz (PAL), 64 kbit/s, 5 MHz,
10 MHz, 27 MHz, 34 Mbit/s, 45 Mbit/s,
52 Mbit/s
–Ethernet interface for remote control over
Internet.
–48 V DC power supply as backup
Working Principle
The Pendulum WM-10/WM-11 Wandermeter
is built in an EMI-proof metal cabinet and con-
tains a Rubidium Reference and a special Time
Interval Error (TIE) measuring circuitry that
phase-compares the connected clock (or data)
signal with the Rubidium reference. The
Wandermeter communicates with the user via
the front panel keyboard and a graphical dis-
play, and with a PC via an RS-232 port. The
WM-11 has also an Ethernet port.
The Wandermeter operates in two different
modes:
nLocal Mode:
The WM-10/WM-11 Wandermeter can be op-
erated stand-alone. During the measurement,
the TIE curve on the display is continuously up-
dated, showing the performance of the
sync-clock “so far”. This mode is intended for
fully automated diagnostics and/or trouble-
shooting measurement “on-site”, with direct vi-
sual feedback at any time. The sampling rate is
approx. 1 Sa/s. The Wandermeter calculates
and presents the MTIE or TDEV curves after a
completed TIE measurement, and compares
with stored masks.
nRemote Mode
The Wandermeter can be remotely controlled
from a PC, running a PC-SW called
WanderViewä. In this mode the
Wandermeter acts as a sampling front-end and
transfers the TIE values one by one to the PC.
The local display of the Wandermeter is not up-
dated. Sample speed is >30 TIE values/s and
the storage is only limited by the PC, which
means that the fast sample rate can be main-
tained during a 24h period (or longer if re-
quired). The PC-SW calculates and presents the
TIE, MTIE or TDEV curves after a completed
measurement period and compares with stan-
dard masks, but it is also possible to take snap-
shots during a running measurement. This
mode is mainly intended for protocolled verifi-
cation measurements according to ITU or ETSI
standards.
Two additional presentation modes, ADEV and
MADEV, can be used from WanderView. See
introduction on page 5-12.
RS-232 Connection
A PC is connected to the RS-232 port at the rear
of the instrument. A suitable cable should have
female DB9 connectors at both ends and be de-
signed as a “null-modem” cable. Such a cable is
delivered with the instrument.
Ethernet Connection (only WM-11)
After configuration by means of the
WanderView SW over the auxiliary RS-232 in-
terface marked CONFIG IP, the Ethernet inter-
face lets the operator communicate with the
Wandermeter in much the same way as with
any Ethernet node. Remote control and data
logging over the Internet is thus a simple task.
Standard Cat 5 patch cords of good quality with
RJ45 connectors can be used.
Note: There are two types available,
straight-through and cross-wired. The first one
is used when connecting to a wall outlet or a
hub, the second one when connecting directly
to a PC or other controller.
1-3 Introduction
Preface

Easy to Use
A fully automatic signal check informs the user
whether he/she has connected the right signal
from the rack (e.g clock or data signal).
The unit can be left unattended. It stops after set
measuring time and can even delay its measure-
ment start if certain conditions are met. This
function is intended for letting the instrument
warm up properly before a critical measure-
ment. The invoked timer starts automatically on
power-up, so if the desired delay has already
passed when the command is entered, nothing
will happen.
On-line context-sensitive help is available,
making the users manual obsolete in most
cases.
1-4 Introduction
Preface

Chapter 2
Safety Instructions

Introduction
Read this page carefully before you install and
use the instrument.
This instrument has been designed and tested
according to safety Class 1 requirements of IEC
publication EN61010-1 and CSA 22.2 No.231,
and has been supplied in a safe condition. The
user of this instrument must have the required
knowledge of it. This knowledge can be gained
by thoroughly studying this manual.
This instrument is designed to be used by
trained personnel only. Removal of the cover
for repair of the instrument must be done by
qualified personnel who are aware of the haz-
ards involved. There are no user-serviceable
parts inside the instrument.
Safety Precautions
To ensure the correct and safe operation of this
instrument, it is essential that you follow gener-
ally accepted safety procedures in addition to
the safety precautions specified in this manual.
Caution and Warning
Statements
CAUTION: Shows where incorrect
procedures can cause damage to,
or destruction of equipment or
other property.
WARNING: Shows a potential danger
that requires correct procedures
or practices to prevent personal
injury.
Symbols
Shows where the protective ground
terminal is connected inside the instru-
ment. Never remove or loosen this
screw.
Indicates that the operator should con-
sult the manual.
2-2 Introduction
Safety Instructions
Z
Z
Z
...
SAFETY
Figure 2-1 Do not overlook the
safety instructions!