Bluebell BC625 User manual

Operation Guide
BC625
Fibre Audio Interface
Ref: BC625-OperationGuide-v2
BC625
SETUP AUDIO I/OOPTI/O
VR2
S/L LOCK
VR1

BC625-OperationGuide-v2 2
Bluebell Opticom Ltd.
Unit 2, The Quadrant
Howarth Road
Maidenhead
Berkshire
SL6 1AP
United Kingdom
Tel: [phone]
Fax: [phone]
Email: [email protected]
Web: www.bluebell.tv
Please note that all documentation herein is of a confidential nature and may not be
reproduced without written confirmation from Bluebell Opticom Ltd. The technical descriptions
and schematics are to aid service and repair only. Dissemination to a third party or parties will
constitute breach of copyright.
Information in this document is subject to change without notice and does not represent a
commitment on the part of Bluebell Opticom Ltd.
Bluebell Opticom Ltd. has taken all possible steps to ensure that the information given here
is both correct and complete. In no event can Bluebell Opticom Ltd. accept any liability or
responsibility for any loss or damage to the owner of the equipment, any third party, or any
equipment which may result from use of this manual or the equipment which it describes.
Declaration of Conformities
The components of the Bluebell Opticom BC625 Fibre-optic Transmission System complies
with the essential requirements of the following EU directives, where appropriate:
EMI/RFI: complies with:
89/336/EEC, EN55022B
EN61000-4-2, EN61000-4-4 (Level 2), EN61000-4-4FTB
EN61000-4-5, EN61000-4-11
Electrical: complies with:
EN61000-6-1, EN61000-6-2, EN61000-6-3, EN61000-6-4
Laser Safety: Dependent on SFP fitted.
Complies with Class 1 laser product

BC625-OperationGuide-v2 3
RoSH and WEEE declaration
Bluebell Opticom Ltd. complies with EU RoSH Directive 2002/95/EC, which restricts
theuseofsubstanceshazardous to humans and their environmentinthemanufacture
of electrical and electronic equipment.
The “crossed out wheelie bin” symbol on the enclosures and represented above is there to
remind users of the obligation of selective collection of waste. This label is applied to various
products to indicate that the product is not to be thrown away as unsorted municipal waste.
At the end of life, dispose of this product by returning it to the point of sale or to your local
municipal collection point for recycling of electric and electronic devices.
Customer participation is important to minimize the potential effects on the environment and
humanhealththatcanresultfromhazardoussubstancesthatmaybecontainedinthisproduct.
Please dispose of this product and its packaging in accordance with local and national
disposal regulations, including those governing the recovery and recycling of waste electrical
and electronic equipment. Contact your local waste administration, waste collection company
or dealer.

BC625-OperationGuide-v2 4
Table of Contents
Overview ...................................................................................................... 5
Introduction ...............................................................................................................................................5
Physical formats.....................................................................................................................................5
Power requirements..............................................................................................................................5
BC625 connections ......................................................................................6
System block diagram...................................................................................8
Configuration and setup options..............................................................................................9
Appendix ......................................................................................................9
Specifications – BC625.............................................................................................................10
Optical wavelengths.....................................................................................................................11

BC625-OperationGuide-v2 5
Overview
Thank you for purchasing this Bluebell Opticom professional broadcast video product. If you
are new to Bluebell products, or to the subject of transmitting audio or other types of signals
over fibre links, please take the time to read through this document before putting the BC625
to use.
Introduction
The BC625 plug-in card belongs to the range of the Bluebell Opticom BC Series modular
fibre interfaces, designed primarily for Outside Broadcast (OB) applications. It is a 4-channel
transceiver, permitting transport of four analogue audio signals in each direction between two
locations remote from each other over a dual-fibre optical link.
As they are transceivers, BC625 cards will normally be used in pairs.
Physical formats
BC625 cards fit the Bluebell BC100 or BC160 19” modular frames. The frames can house
six (BC160) or fifteen (BC100) interface cards, and are fitted with dual internal AC power
supplies. Alternatively, cards may be fitted into smaller aluminium chassis; the BC101 and
BC102 hold one and two cards respectively and require an external DC power source, while
the BC120 holds three cards and has an integral mains PSU.
All plug-in cards are fitted with cartridge-style SFP dual fibre transceiver modules; both
single-mode and multi-mode versions are available. Single-mode operation will normally be
at 1310 nm or 1550 nm; alternative CWDM grid wavelengths are also possible. The optical
option must be specified at the time of order.
Power requirements
For all versions, power supply requirements are dictated by the enclosure type used.
BC-100 modular frames:
These may be fitted with either one or two AC mains PSU modules (number specified at time of
order). Each module has sufficient capacity to power a fully-loaded frame. TheAC connection
is via standard IEC cables, DC power distribution inside the frame is via the motherboard. See
the User Guide supplied with the frame units for more details.
BC-160 modular frames:
These are fitted as standard with dual internal AC mains power supplies each of sufficient
capacity to power a fully-loaded frame. The AC connection is via standard IEC cables, DC
power distribution inside the frame is via the motherboard. See the User Guide supplied with
the frame units for more details.
BC101 and BC102 single- and dual-slot chassis:
These are supplied with an external Universal AC adaptor which connects to the chassis via a
flying lead terminated in a 4-pin locking XLR connector. Mains is via an IEC connector.
BC120 triple-slot chassis:
This housing for three plug-in cards is fitted with an internalAC mains supply; mains connection
is via a rear IEC connector.

BC625-OperationGuide-v2 6
BC625 connections
BC625
7
2
3
1
4
56
AUDIO I/OOPTI/O
VR2
S/L LOCK
VR1
SETUP
1. AUDIOI/O– all audio connections are made via the hi-density 26-pin female Dsub connector.
All audio inputs and outputs are electronically balanced and at line level, nominally 0 dBu
(0.775 Vrms).
Wire the mating Dsub connector according to the pinout listed below:
PIN FUNCTION PIN FUNCTION PIN FUNCTION
1 I/P A Left + 10 I/P A Left Gnd 19 I/P A Left -
2 I/P A Right + 11 I/P A Right Gnd 20 I/P A Right -
3 I/P B Right + 12 I/P B Right Gnd 21 I/P B Right -
4 I/P B Left + 13 I/P B Left Gnd 22 I/P B Left -
5 O/P A Left + 14 O/P A Left Gnd 23 O/P A Left -
6 O/P A Right + 15 O/P A Right Gnd 24 O/P A Right -
7 O/P B Left + 16 O/P B Left Gnd 25 O/P B Left -
8 O/P B Right + 17 O/P B Right Gnd 26 O/P B Right -
9 No connection 18 No connection
1
10
19
9
18
26
Rear (solder side) of mating male connector
Rear (solder side) of mating male connector
I/P A LeftI/P B RightO/P A LeftO/P B Left
Hot
Cold
Gnd
I/P A RightI/P B LeftO/P A RightO/P B Right

BC625-OperationGuide-v2 7
2. OPTICAL I/O - SFP dual fibre connector. The connector is mounted on a removable
cartridge. The BC625 uses single-mode fibre as standard, at a wavelength of 1310 nm;
alternative CWDM wavelengths or multi-mode operation are available if specified at the
time of order. A list of alternative SFP modules and wavelengths can be found in the table
at the end of this User Guide. Modules may be retrofitted.
3. SETUP - this hexadecimal switch has no current function; it is reserved for future use.
4. S/L – this red LED illuminates when the received power at the optical input is below the
minimum threshold for correct operation.
5. LOCK - this red LED illuminates when the unit is not locked to a signal received at the optical
input.
6. VR1 - this preset control is set at the factory to give the correct digital output for a given
analogue audio input.
7. VR2 - this preset control is set at the factory to give the correct analogue audio output level
from a given digital audio input signal.
IMPORTANT: VR1 and VR2 should not require adjustment by the user.

BC625-OperationGuide-v2 8
System block diagram
InputA
InputB
L
R
R
L
Output
A
Output
B
L
R
R
L
The four analogue inputs are electronically balanced, and will accept a maximum level of
+24 dBu (ref. 1 mW into 600 ohms). A-D conversion is 24-bit, 48 kHz sampling rate.
Post-conversion, the four audio inputs are converted into two AES3 signals before modulation
onto the optical carrier.
The received optical signal is demodulated and the AES3 signals passed for D-A conversion.
The analogue audio outputs are electronically balanced, and can supply a maximum level of
+18 dBu (ref 1 mW into 600 ohms).
Note that overall gain throughout the system – transmitter > optical fibre > receiver – is
unity (0 dB).

BC625-OperationGuide-v2 9
Configuration and setup options
The BC625 has only one setup option which may need to be altered by the user. This controls
the audio signal level relationship between analogue and digital domains.
The jumper, LK1, is located at the rear of the left-hand PCB, as the module is viewed from the
rear.
LK1
3
1
2
3
1
2
(LK1 enlarged view)
-24 dBFS
-18 dBFS
0 dBu ≡
The jumper position sets the digital output level relative to an analogue signal level of 0 dBu.
The table below summarises the options:
SETTING ANALOGUE LEVEL DIGITAL LEVEL
Pins 1 and 2 linked 0 dBu -18 dBFS
Pins 2 and 3 linked -24 dBFS
The setting of 0 dBu = -18 dBFS is widely used throughout Europe. The second setting of
0 dBu = -24 dBFS may be encountered in other territories, particularly in the USA, where it is
normally written as +4 dBu = -20 dBFS.
The jumper may be moved and repositioned with a small pair of long-nosed pliers.
Other settings:
The BC625 has further jumpers located on the other PCB; these are for factory use only and
should not be disturbed.

BC625-OperationGuide-v2 10
Appendix
Specifications – BC625
Analogue audio Inputs (4)
Input impedance 24 kohm (balanced)
Max. input level +24 dBu (ref 1mW into 600 ohms)
Noise < -90 dB pk-pk weighted full scale
Frequency response 20 Hz – 20 kHz ±0.5 dB
Analogue audio Outputs (4)
Output impedance 44 ohms (balanced)
Max. output level +18 dBu (ref 1mW into 600 ohms)
Noise < -90 dB pk-pk weighted full scale
Frequency response 20 Hz – 20 kHz ±0.25 dB
Optical Input/Output
Physical SFP Module
Connector Dual LC
Wavelength 1310 nm single-mode or 850 nm multi-mode. User-specified CWDM
wavelengths (see following table) are also available
Optical Power -2 dBm @ 1310/1510 nm (typical)
Conformities
EMI/RFI
Complies with:
89/336/EEC, EN55022B, EN61000-4-2, EN61000-4-4 (Level 2),
EN61000-4-4FTB,
EN61000-4-5 & EN61000-4-11
Electrical Complies with:
EN61000-6-1, EN61000-6-2, EN61000-6-3 & EN61000-6-4
Laser Safety SFP-dependent; complies with Class 1 laser product
RoHS Complies with Directive 2002/95/EC
Physical
Depth 80 mm (inc. connector)
Width 20 mm (4TE)
Height 129 mm (3RU)
Weight 100 g
Operating Temp -30 to +70°C
Power 4.8 W

BC625-OperationGuide-v2 11
Optical wavelengths
Part Ref. Transmitter Receiver
Standard wavelengths:
DTR/M/SFP Multimode dual fibre SFP transceiver, 850nm
Wideband
DTR/S/SFP Single mode dual fibre 40 km SFP transceiver, 1310 nm
DTR/S/WDM/13/SFP Single mode single fibre 10 km SFP transceiver, 1310 nm
DTR/S/WDM/15/SFP Single mode single fibre 10 km SFP transceiver, 1550 nm
CWDM wavelengths:
DTR/S/SFP/CWDM/27 Single mode, single channel CWDM SFP transmitter, 1270nm
Wideband
DTR/S/SFP/CWDM/29 Single mode, single channel CWDM SFP transmitter, 1290nm
DTR/S/SFP/CWDM/31 Single mode, single channel CWDM SFP transmitter, 1310nm
DTR/S/SFP/CWDM/33 Single mode, single channel CWDM SFP transmitter, 1330nm
DTR/S/SFP/CWDM/35 Single mode, single channel CWDM SFP transmitter, 1350nm
DTR/S/SFP/CWDM/37 Single mode, single channel CWDM SFP transmitter, 1370nm
DTR/S/SFP/CWDM/39 Single mode, single channel CWDM SFP transmitter, 1390nm
DTR/S/SFP/CWDM/41 Single mode, single channel CWDM SFP transmitter, 1410nm
DTR/S/SFP/CWDM/47 Single mode, single channel CWDM SFP transmitter, 1470nm
DTR/S/SFP/CWDM/49 Single mode, single channel CWDM SFP transmitter, 1490nm
DTR/S/SFP/CWDM/51 Single mode, single channel CWDM SFP transmitter, 1510nm
DTR/S/SFP/CWDM/53 Single mode, single channel CWDM SFP transmitter, 1530nm
DTR/S/SFP/CWDM/55 Single mode, single channel CWDM SFP transmitter, 1550nm
DTR/S/SFP/CWDM/57 Single mode, single channel CWDM SFP transmitter, 1570nm
DTR/S/SFP/CWDM/59 Single mode, single channel CWDM SFP transmitter, 1590nm
DTR/S/SFP/CWDM/61 Single mode, single channel CWDM SFP transmitter, 1610nm