Broadcast B044 User manual

B044
DUAL G703 DETECTOR
Handbook Version 1.0

DUAL G703 Detector B044
2004 dB Broadcast Ltd
dB Broadcast Ltd has made every effort to ensure the accuracy of information contained within this
document which is nevertheless supplied for information purposes only and does not constitute any
form of warranty or guarantee.
All trademarks acknowledged.
The information in this document is subject to change without notice.
dB Broadcast Ltd
Registered Office:
Kestrel House
Sedgeway Business Park
Witchford
Ely
Cambridgeshire
CB6 2HY
UK
Tel: [phone]
Fax: [phone]
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Registered in England No. 2709677

DUAL G703 Detector B044
2004 dB Broadcast Ltd
D
Do oc cu um me en nt t h hi is st to or ry y
Date of first publication 12/06/2004
Current issue and date
Board issue numbers
covered
259-044-011

DUAL G703 Detector B044
2004 dB Broadcast Ltd
C
Co on nt te en nt ts s
INTRODUCTION 1
Main features 2
INSTALLATION 3
SELECTING REAR CONNECTORS 3
Rear panel connections 4
CONFIGURATION AND OPERATION 5
Front panel control 5
CONFIGURATION 6
Channel A link functions and adjustments 6
Channel B link functions and adjustments 6
Mode selection – affects both channels 6
Selecting the relay drive signal 7
Selecting the micro-controller mode 7
SAMPLE PROBLEMS AND THEIR SOLUTIONS 8
ORDERING INFORMATION 9
SPECIFICATION 10

DUAL G703 Detector B044 Introduction
2004 dB Broadcast Ltd 1 Version 1.0
I
In nt tr ro od du uc ct ti io on n
The B044 is part of the Hawkeye range of detector modules for monitoring G703 signals at
2.048MHz rate.
It fits in either 1U or 3U Avitel or Vistek frames and power is derived from the frame PSU. An
on-module regulator provides +/- 5 Volt rails.
The B044 dual G703 detector
The module monitors two incoming signals and provides active loop through outputs on
BNC’s and provides local indications on the front panel of the module. It also provides
remote status signals via open collector or relay outputs.
The design is implemented using an industry standard line receiver/framer chip from PMC. A
micro-controller processes the data from the framer to provide the local and external alarms.
A peak detector provides level detection with adjustable threshold, normally set to –4dB.

DUAL G703 Detector B044 Introduction
2004 dB Broadcast Ltd 2 Version 1.0
Main features
• Two independent detectors per module
• 75R transformer coupled input and output (120R Bal. if req)
• Active loop through output/Input level detector with adjustable threshold
• Four alarm indications per channel
• All alarms are available on open collectors
• Any one of the four alarms is selectable to the summary alarm (Relay)
• Four alarms:
• Signal level indication
• Alarm insertion signal present (AIS) & TS16 AIS
• Loss of Framing or Multi Framing
• CRC 4 quality threshold alarm
• Threshold adjustable ± 6dB, alarm will turn on with loss of signal
• Alarm will turn on when three consecutive incorrect frame alignment signals have been
received
• CRC4 errors are counted internally and update a 10 bit counter every second, with the
alarm being set if the count exceeds a pre- determined level

DUAL G703 Detector B044 Installation
2004 dB Broadcast Ltd 3 Version 1.0
I
In ns st ta al ll la at ti io on n
Selecting rear connectors
The available rear connectors and the frames/signal I/O used are as follows:
Type Frame Connectors Signal types
VMC 3306K 1U/3U Avitel BNCs G703 at 2.048MHz
VB110 1U(F010)/3U
Vistek
BNCs G703 at 2.048MHz
A
vitel style chassis
VMC 3306K
3U Vistek style
chassis VB110

DUAL G703 Detector B044 Installation
2004 dB Broadcast Ltd 4 Version 1.0
Rear panel connections
SIGNAL CONNECTOR COMMENTS
A1 BNC Channel A Input
A2 BNC Not used
A BNC Channel A loop through output
B1 BNC Channel B Input
B2 BNC Not used
B BNC Channel B loop through output
Control and Status - 26 way D type
PIN SIGNAL (pins 1 –13) PIN SIGNAL (pins 14 – 26)
1 Ctrl 0V 14 0V
2 Not connected 15 Relay B1 Com
3 Frame Error A (open collector) 16 Relay B1 NC
4 Level Low A (open collector) 17 Relay B1 NO
5 AIS Present A (open collector) 18 Relay B2 Com
6 CRC 4 High A (open collector) 19 Relay B2 NC
7 Relay A1 Com 20 Relay B2 NO
8 Relay A1 NC 21 CRC 4 High B (open collector)
9 Relay A1 NO 22 AIS Present B (open collector)
10 Relay A2 Com 23 Level Low B (open collector)
11 Relay A2 NC 24 Frame Error B (open collector)
12 Relay A2 NO 25 Not connected
13 0V 26 Ctrl 0V
Note: NO = normally open, NC = normally closed and Com = common

DUAL G703 Detector B044 Configuration and operation
2004 dB Broadcast Ltd 5 Version 1.0
C
Co on nf fi ig gu ur ra at ti io on n a an nd d o op pe er ra at ti io on n
Front panel control
LED Indicators:
VGreen – Indicates DC power present & OK
Frame Red – General Fault alarm
AIS Red – Input selection controlled from front panel
Level Green – Input selection controlled remotely
CRC Yellow – Indicate G703 error detection
Controls:
Threshold Signal loss threshold adjustment
Avitel Vistek
LED Ext Alrm Meaning when lit
Frame Frame Error Loss of framing or multi-framing (if enabled)
AIS AIS Present Alarm insertion signal present (AIS & TS16 AIS)
Level Level low Signal below threshold set by RV1 (CHA) or RV2 (CH B)
CRC CRC4 high Quality below CRC-4 threshold (if enabled)
Note: Relay outputs are programmable – see Configuration.

DUAL G703 Detector B044 Configuration and operation
2004 dB Broadcast Ltd 6 Version 1.0
Configuration
Each channel has a number of configuration jumper links and adjustments.
The B044 Dual G703 Detector showing jumper links
Channel A link functions and adjustments
Adjustment Main Module - Channel A jumpers
JP1 Select detected error to drive relay outputs FRM, LEV, AIS or CRC – see
next section
RV1 Adjust signal loss threshold
JP10 Fit this jumper to enable voltage spike suppression on the Channel A input
Channel B link functions and adjustments
Adjustment Main Module - Channel A jumpers
JP2 Select alarm signal to drive relay outputs FRM, LEV, AIS or CRC – see
next section
RV2 Adjust signal loss threshold
JP11 Fit this jumper to enable voltage spike suppression on the Channel B input
Mode selection – affects both channels
Adjustment Main Module - Channel A jumpers
JP3 Select Micro-controller mode CRC4_1, CRC4_2 or MF-Disable – see next
section

DUAL G703 Detector B044 Configuration and operation
2004 dB Broadcast Ltd 7 Version 1.0
Selecting the relay drive signal
Each channel has a relay with two sets of contacts, which may be driven from one of four
detected error signals.
The error signals are:
Error JP1
CH A
JP2
CH B
Description
Frame FRM FRM Loss of framing or multi-framing (if enabled)
Level LVL LVL Signal level below threshold set by RV1 (CHA) or
RV2 (CHB)
AIS AIS AIS Alarm insertion signal present (AIS & TS16 AIS)
CRC-4 CRC CRC Quality below CRC-4 threshold (if enabled)
Selecting the micro-controller mode
The micro-controller may be operated in one of three modes:
Mode JP3 position Description
Near front panel Not used
CRC4 CRC4_1 CRC-4 threshold alarm enabled (default)
CRC4 CRC4_2 CRC-4 threshold alarm disabled
MF-Dis MF-Dis Multi-frame disabled

DUAL G703 Detector B044 Configuration and operation
2004 dB Broadcast Ltd 8 Version 1.0
Sample problems and their solutions
The unit does not appear to operate correctly
Check that the green ‘V’ LED is illuminated and that the module is seated correctly in the
frame.
Check that the appropriate rear connector has been cabled correctly.
The Level LED keeps blinking on and off for good signals
Check that the front panel threshold sensitivity is set correctly – try backing the sensitivity off a
little (RV1 for CHA and RV2 for CHB).
Check that the incoming signal is not double terminated.
The FRAME or CRC LEDs never operate, even with known bad signals
Check that the micro-controller is being operated in the correct mode.

DUAL G703 Detector B044 Ordering information
2004 dB Broadcast Ltd 9 Version 1.0
O
Or rd de er ri in ng g i in nf fo or rm ma at ti io on n
B035 types
Different frames require different mechanical fittings. All module functionality is identical.
B044 Version for Avitel Chassis
B044/V Version for Vistek Chassis
3U Avitel configuration
ERF 3390K–P1 3U Chassis, 14 Module slots, 1 PSU slot, (no PSUs included)
ERF 3390K–P2 3U Chassis, 12 Module slots, 2 PSU slots, (no PSUs included)
MPS 3392L PSU for above chassis, (no PSUs included)
VMC 3306K BNC Rear connector module, (no PSUs included)
1U Avitel configuration
ERF 1131K 1U Chassis, 3 Module slots, PSU mounted externally, (no PSUs
included)
MPS 0330 PSU for above chassis (requires mounting holsters)
ECA 0331 Mounting holsters for PSU MPS 0330
VMC 3306K BNC Rear connector module
3U Vistek configuration
V1606-dB-2PSU 3U Chassis, 14 Module slots, 2 PSU slots (2 PSUs included)
V1610-dB-48V 3U Chassis, 14 Module slots, 2 48V PSU slots (2 48V PSUs included)
VB110 BNC Rear connector module
1U Vistek configuration (dual PSU)
F010 1U Chassis, 2 Module slots, 2 PSUs ( PSUs included)
VB110 BNC rear connector module

DUAL G703 Detector B044 Specification
2004 dB Broadcast Ltd 10 Version 1.0
S
Sp pe ec ci if fi ic ca at ti io on n
INPUTS & OUTPUTS
Interface G703 75 Ohm or 120 Ohm – factory fitted option – with active loop though
outputs
Framing: CRC4, Multi-frame or Non-CRC4
Data rate: 2.048Mbps +/-50ppm
Connectors 2 x 3 BNCs (two used per channel)