Bharat Electronics Limited

The Digital Cross Connect (DCC) is a transmission equipment used in synchronized digital network to cross connect nx64 kbps channels between 2048 kbps access ports. The system has a capacity of 128 E1 ports upgradable to 512 without causing disruption to existing traffic carrying cross connect circuits. DCC can realize unidirectional, bidirectional broadcast, cross connection at 64 kbps, nx64 kbps, CAS ABCD bits and National spare bits. DCC supports exhaustive online and offline maintenance capabilities using loop back, test access at 64 kbps/ 2 Mbps and standard test signals insertion / monitoring. The equipment can be controlled from local as well as remote stations through powerful command set of Man Machine Interface (MMI) running on PC platform under Windows 95/ NT environment.
FEATURES:
Connectivity upto 512 E1 ports with zero blocking factor
Both framed and unframed streams support
CAS and CCS signalling support
Flexible network synchronization schemes
Exhaustive online and offline maintenance capabilities
Fully controllable from local & remote stations
PC based, user friendly, point & click menu driven MMI on windows 95 / NT
Performance monitoring as per ITU-T recommendations G.821 & G.826 conforms to ITU-T
recommendation G.796
Extremely high survivability with self diagnosis & switchover to redundant unit
Highly compact, modular, flexible & robust platform
Meets TEC spec. No. G / DTC-01 / 01 September 94
Highly reliable and cost effective
TECHNICAL SPECIFICATIONS:
GENERAL
Capacity Upto 512 E1 ports (16 E1 ports per card)
Redundancy Control, Switching matrix, Timing signals & Power Supply Units

Timing Signals External, any E1 port/Internal with clock hold over
Unidirectional, Bidirectional, broadcast conference Multipoint
test access,loop backs, signal insertion

Cross connect channels 64 kbps

The High bit rate Digital Subscriber Line (HDSL) is a simultaneous full duplex transmission Scheme which derives substantial capacity advantage in transporting digital signal in the Local Networks over existing copper pairs. This equipment provides 64 kbps Channels, supporting Voice, Fax and Data services while matching fiber quality transmission performance. A complete HDSL System consists of two terminal equipment called central office Terminal (COT) and 2/3 nos. of Remote Terminals (RT) connected by 2/3 pairs of wire.
The A2 /B2 category supports point-to-multi point transportation of 30 channels of 2W POTs, Hotlines and 64 kbps Co directional circuits. Category A2 utilizes a two pairs duplex operating system transporting at a bit rate of 1168 kbps bi-directionally over each of the two pairs in parallel while category B2 utilizes a three pairs duplex operating system with a reduced bit rate of 784 kbps transported bi-directionally over each of the three pairs in parallel. These equipments cover around 3.5/3.75 kms on 0.5 mm unshielded twisted copper pairs.
FEATURES:
Simultaneous transmission of voice and data on copper pair.
Supports POTs, PCOs, Hotlines 64 kbps Co directional interface.
Supports full BORSHT functionality at the RT two wire subscriber interface.
NMS for real time monitoring, performance and fault management.
Remote power feeding thus removes the power arrangement at remote site.
Equipment Conforms to TEC Spec No. G/ANE-02/01. DEC 95
Provide better utilization of existing infrastructure protecting investments already made
Compact design with high reliability using state of art technology.
Human safety incorporated in case of accidental touch/short on DSL Line.
TECHNICAL SPECIFICATIONS:
GENERAL
Line Code 2B1Q
Line bit rate (2 pair system A2) 1168 kbps.
Line bit rate (3 pair system B2) 784 kbps.
Line impedance 135 ohm balanced
Pulse amplitude 2.64 V (nom)
Transmission medium 0.5 m

FEATURES:
PC based generic platform for auto enquiry/ complaint lodging.
Scalable from 8 ports to 60 ports.
Supports both analog Tip / Ring as well as digital trunk (E1) interface.
Application independent platform.
Operates in non AC environment in India.
SALIENT FEATURES
PC- based generic platform.
Table top model.
Ergonomic design.
Operates in non AC environment.
Scalable from 8 ports to 60 ports .
Supports both analog Tip/ Ring as well digi8tal trunk (E1) interface.
The following combinations are supported:
- One 30 channel E1 with Tip & Ring interface.
- One 30 channel E1 with Tip & Ring interface and one 30 channel E1 interface with CAS.
- Two E1s (60 channels) with CAS.
State of the art Digital Signal Processing (DSP) technology has been used.
Supports decadic pulse an DTMF tone detection for digit collection and MF tone generation
for signalling.
Announcements can be recorded online .
Application supported:
User initiated
Interactive changed number announcement
Interactive telephone bill inquiry
Automatic complaint handling
Interactive commercial information and special services assistance
Interactive telephone fault clearance
System initiated
Automatic bulk changed number announcement
Automatic payment reminder

The 8/34 Mbps Digital MUX (FM-34) Equipment combines upto four 8448 kbps plesiochronous tributaries inputs into a single 34368 kbps output. Five terminals of FM-34 can be housed in a single slim rack. The multiplexing is carried out using a process of positive justification and cyclic bit interleaving. Using a bit disinterleaving process, the demultiplexer separates the 34368 kbps input into four signals, A dejustification process convert these to 8448 kbps signals.
FEATURES:
Slim Rack vertical construction
Accepts plesiochronous tributary input of 2048 kbps
Equipments conform to CCITT recommendations
All connections from equipment front hence no dependence on rack hardware
Meet TEC Specifications
Compact design with high reliability using state of art technology
Interface to PC for NMS application
Low power consumption
TECHNICAL SPECIFICATIONS:
GENERAL
Bit rate 34368 kbps 20 ppm
Tributary bit rate 8448 kbps 30 ppm
Number of tributaries 4
Frame structure 1536 bits made up of 4 sets of 384 bits each
Bits per tributary 378
Multiplexing By cyclic bit interleaving in the order of the
tributaries and positive justification

DIGITAL INTERFACE
2048 kbps interface bit rate 8448 kbps 50 ppm
Code HDB-3
Output / input impedance 75 ohm unbalance
Pulse amplitude (peak to zero) 2.37 V 10%
Pulse width 59 ns 25 ns
Ratio of +ve and ve pulse amplitude 1 0.05
Ratio of +ve and ve pulse width 1 0.05
Jitter As per CCITT recommendation

34368 kbps interface bit rate 34368 kbps 20 ppm
Code HDB-3
Output / input impedance 75 ohm unbalance
Pulse amplitude (peak to zero) 1 V 10%
Pulse width 14.55 ns 2.45 ns
Ratio of +ve and ve pulse amplitude 1 0.05
Ratio of +ve and ve pulse width 1 0.05
Jitter

2/34 Mbps Digital MUX (FM-2/34) Equipment combines upto sixteen 2048 Kbps plesiochronous tributaries inputs into a single 34368 Kbps output. Five terminals of FM-2/34 can be housed in a single slim rack. The multiplexing is carried out using a process of positive justification and cyclic bit interleaving. Using a bit disinterleaving process, the demultiplexer separates the 34368 Kbps input into four signals, A dejustification process convert these to 2048 Kbps signals.
An exhaustive list of commands covering all OAM & P activities are available to control local & remote station equipment through a MMI. In built PRBS generator and Checker along with tributary Local / Remote loopback facilities provide easy maintenance obviating the need for any test instruments to check total path. The equipment can also be controlled from a PC for NMS applications Slim Rack vertical construction
Accepts plesiochronous tributary input of 2048 Kbps
Equipments conform to CCITT recommendations
All connections from equipment front hence no dependence on rack hardware
Meet TEC Specifications
Compact design with high reliability using state of art technology
Interface to PC for NMS application
Low power consumption
TECHNICAL SPECIFICATIONS:
GENERAL
Bit rate 34368 kbps 20 ppm
Tributary bit rate 2048 kbps 50 ppm
Number of tributaries 16
Frame Sructure 1536 bits made up of 4 sets of 384 bits each intermediate 8448
kbps streams, Each 8448 kbps stream has 848 bits made up of 4
sets of 212 bits each

Multiplexing By cyclic bit interleaving of intermediate 8448 kbps streams
which in turn are also made by cyclic bit interleaving of four
tributaries at 2048 kbps
DIGITAL INTERFACE
2048 kbps interface bit rate 2048 kbps 50 ppm
Code HDB-3
Output / input impedance 120 ohm balance
Pulse amplitude (peak to zero) 3.0 V

Bharat Electronics Digital Multiplex Hierarchy consists of Primary PCM MUX (2048 kbps), 2/8 Mbps Digital MUX (8448 kbps), 8/34 Mbps Digital MUX (34368 kbps) and 2/34 Mbps Digital SKIP MUX (34368 kbps). Five terminals of 2/8 Mbps Digital MUX (8448 kbps) can be housed in a standard Slim Rack.
BSNL, Private Telecom Operators, Defence
FEATURES:
Slim Rack vertical construction
Accepts plesiochronous tributary input of 2048 Kbps
Equipments conform to CCITT recommendations
All connections from equipment front hence no dependence on rack hardware
Meet TEC Specifications
Compact design with high reliability using state of art technology
Low power consumption
TECHNICAL SPECIFICATIONS:
GENERAL
Bit rate 8448 Kbps 30 ppm
Tributary bit rate 2048 Kbps 50 ppm
No. of Tributaries 4
Frame structure 848 bits made up of 4 sets of 212 bits each
Bits per tributary 206
Multiplexing By cyclic bit interleaving in the order of the
tributaries and positive justification

DIGITAL INTERFACE AT 2048 kpbs
2048 kbps interface bit rate 2048 kbps 50 ppm
Code HDB3
Output & Input impedance 120 ohm balanced
Pulse amplitude 3 V 10% (peak to zero)
Pulse width 244 ns 25 ns
Ratio of +ve and ve pulse amplitude 1 0.05
Ratio of +ve and ve pulse width 1 0.05
Jitter As per CCITT recommendation

8448 kbps interface bit rate 8448 kbps 50 ppm
Code HDB3
Output & Input impedance 75 ohm balanced
Pulse amplitude 2.37 V 10% (peak to zero)
Pulse width 59 ns 10ns
Ratio of +ve and ve pulse amplitude 1 0.05
Ratio of +ve and ve pulse width 1 0.05
Jitter As per CCITT recommendation

POWER SUPPLY
Input voltage -40 to 60V DC
Input power / system 6 W
DC operating voltage +5 V 5%

8 Mbps Optical Line Terminal Equipment is designed to be used in optical fibre network. The equipment works on single mode optical fibre at 1310 nm wavelength. This equipment shall have input signal from HDB3 coded 8448 kbps digital bit stream as per CCITT recommendation G.703. This digital signal is then converted into optical signal by LASER Diode and then transmits it through optical fibre.In receive direction, the optical signal is converted to digital signal using PIN FET. The output signal is HDB3 coded 8448 kbps digital bit stream.
FEATURES:
Slim rack vertical construction
Works on single mode optical fibre
Built-in OrderWre facility
Use of state-of-art Optical Transmitter and Receiver module
Laser Diode Shut-off function provided for safety
Display of fault conditions through LEDs
PC interface for NMS application
Comply with TEC specification
TECHNICAL SPECIFICATIONS:
DIGITAL INTERFACE
Bit rate 8448 kbps 30 ppm
Code HDB-3
Output / input impedance 75 ohm unbalanced
Pulse amplitude (peak to zero) 2.37 V 10%
Pulse width 59 ns 10 ns
Input Jitter acceptance 1.5 UI PP for 20 Hz to 400 Hz
0.2 UI PP for 3 kHz to 400 kHz

Output Jitter 0.75 UI PP for 20 Hz to 3 kHz
0.2 UI PP for 3 kHz to 400 kHz

OPTICAL INTERFACE
Wavelength 1310 nm 20 nm
Type of connector FC-PC

TRANSMIT SIDE
Guaranteed output power 0 dBm to -5 dBm
Optical source Laser Diode
Optical width of optical diode 3 nm

RECEIVE SIDE
Optical detector PINFET
Dynamic range 25 dBm
Minimum receiver sensitivity -35 dBm to -45 dBm at BER of 1010

FAULT INDICATION
Internal power supply failure
Laser bias current out of limit
Loss of incoming Digital Signal
Bit Error Ratio 1x 10-3

The PCM-MUX Equipment processes up to 30 telephone signals (voice & Signalling) in both directions. In the transmit direction, the voice and signalling information are encoded and combined to form a TDM digital signal with 2048 Mbps rate. In the receive direction, the reverse procedure takes place and the equipment extracts the voice and signalling information 2048 kbps. A common E & M card facilitates 2w/4w operations.
FEATURES:
19 inch rack vertical construction
Sliding cages with plug-in PCB
Mono channel PCM code technique
Channel associated signalling
Exchange wiring accessible from front
Conforms to CCITT recommendations
Meets TEC specifications
Low power consumption
TECHNICAL SPECIFICATIONS:
GENERAL
No. of telephone signals 30
Sampling rate for voice signals 8 kHz
Encoding law A 87.6
Number of quantizing intervals 56
Overload level +3.14 dBm 0.5 dBm
Length of pulse frame 125 s
Length of signalling pulse frame 2 ms
Number of bits per time slot 8
Number of bits per signalling word 4 (a,b,c,d)
Characteristics of PCM-MUX equipment As per CCITT Rec. G.732
Performance characteristics of PCM CCITT Rec. G 712 for 2 w
Channels at AF CCITT Rec. G 713 for 4 ws

DIGITAL INTERFACE AT 2048 kbps
Code HDB 3
Bit rate 2048 kbps 50 ppm
Pulse amplitude 3 V 10% (peak to zero V)
Pulse width 244 ns 25 ns
Output and input impedance 120 ohm balanced

POWER SUPPLY
Input voltage -40 to 58V DC
Input power / system 25 W
DC operating voltage +5 V 5%, +12 V

ENVIRONMENTAL
Operating temp. range +0 C to + 50 C
Relative humidity 95% maximum at 35 C

MECHANICAL
Cage (housing I system) 332 mm (H) x 513 mm (W) x 203 mm (D)
Rack (housing 8 cage) 2750 mm (H) x 609 mm (W) x 228 mm (D)

STM-1 (155.52 Mbps) synchronous multiplexer is an SDH based multiplexing equipment.
FEATURES
Provides access to electrical signals through 2Mbps, 34Mbps, 45Mbps, 140Mbps,
155.52 Mbps electrical interfaces.
Ethernet
Standard optical STM-1 interface.
Configurable as terminal multiplexer,
Add / Drop Multiplexer or Regenerator.
19standard sub rack.
Can be used for short haul as well as
Long haul applications.
Provision for operation 1310 nm & 1550 nm wavelength.
Equipment synchronization from internal or external reference