IPS d.o.o. - VFA V5.2 Access Node

SDN- System for remote power feeding over multiple copper pairs

Trends in Telecommunications and related problems

The demand for bandwidth in copper access network is expanding exponentially and thus putting high pressure on existing networks. For sure fibre can provide the best answer for bandwidth-hungry applications, however it is an also capital-hungry and time consuming solution. Telecom operators can not afford to wait for the »final solution«. The »solution today« is to bring the edge of the network to remote locations, closer to end customers. In this case copper pairs can deliver enough bandwidth for today's need (triple play).

Installing the edge equipment (e.g. DSLAMs) closer to end-users has one major problem: how to power the remote equipment? When providing electricity supply one always faces many problems: construction and safety problems, local authority’s permissions, building permits, private property legal problems, electricity counters installation, charging& billing. etc ...... And it is even more difficult to ensure uninterruptible power supply (UPS) which on top of everything needs regular maintenance!

Trends in Telecommunications and related problems

The solution is to use SDN Remote Powering System to provide power from existing edge points (e.g. central offices, existing street cabinets....) where uninterruptible power supply is already available. SDN system uses up to 16 copper pairs in order to provide up to 200 W on 48 VDC on remote location, using 48 VDC source in Central Office.

System consists of two units: Central-office Unit (CU) unit which connects to 48 VDC power source (UPS) in Central Office or similar place and Remote Unit (RU) unit which is installed on remote premises in small street cabinet or similar. Up to 16 parallel copper pairs are used to transport the power from CU to RU. The system is built modularly, meaning for each pair there is a dedicated module on CU and RU which may be omitted if less than 16 copper pairs are available or lesser power is needed. Range of transported power is from 15 to 170 W. Both units fit into standard 19'' rack with 1 HU height.

Technology used in SDN System

48 VDC from Central office side is transported in the most efficient way over up to 16 pairs to remote side, strictly following safety standards EN60950 and EN60950-21. Control circuits on RU constantly regulate input currents on all lines in order to adapt to load changes and provide minimum losses on the line. Output current limiter on RU protects the unit and equipment from in-rush currents. Ethernet and RS-485 ports are available for management and supervision of the system. Additional general purpose input/output pins are available for optional sensors and/or activators.

Technical characteristics

SDN-016-S (RU)
Input
Max number of line used(inputs)	16
Max current on the line	55mA
Typical input voltage	300 VDC
Output
Max out power	200 W
Max efficiency	75%
Output voltage	52 V ± 4 V
Output voltage	52 V ± 4 V
Earthing
Earthing connection	4-pole connector(+ or -, user selectable)

SDN-016-E (CU)
Output
Max. number of lines used for powering (outputs)	16(tip SDN-16)
Max current on the line	60mA
Typical output voltage	300 VDC
Input
Input voltage range	from 36VDC to 72VDC
Max. input power	400 W
Max. efficency (SDN- 16E)	75%
Earthing
Earthing connection	+ pole grounded

SDN-016 system
Standards
Safety	EN60950, EN60950-21
EMC	EN55022 class B, ETSI EN 300386
Operating temperature range
Min./max. ambient temperature at relative humidity 0%- 95%, without condensation	-20°C to 50°C
Dimensions
Height	44 mm(1HU)
Width	482 mm(19'')
Depth	167 m
Management and control
Ethernet	RJ-45
RS485	RJ-11, galvanic isolated interface, with additional galvanic isolated power supply for power feeding of extern sensor units,(8-12 VDC, 2mA (internally limited), 1W, 1500 VDC insulation voltage.
Digital inputs(2)	Max. Voltage 80V, max. Control current 2mA (internally limited), galvanic isolated
Digital outputs(2)	300VDC, max. current 100mA, galvanic isolated

Management system(option)
Ethernet interface	Ethernet 10Mbps, HTTP, SNMP v1.
Communication interface 2(option)	RJ-485, RJ-11
Information/commands available over HTTP and SNMP	Number of powering copper pairs available, Number of powering copper pairs in operation, Values of input/output currents and Number of powering copper pairs available, Number of powering copper pairs in operation, Values of input/output currents and voltages, Temperature inside of the unit, Status of digital input pins, Control of digital output pins.
Optional features	With additional control modules, which communicate via RS 485 is possible to supervise additional parameters like: Room temperature, Water outflow etc.

Product Data Sheet

SDN.pdf (312 KB)

	© 2005-2010 IPS d.o.o., All Rights Reserved. \| Design: studio OX d.o.o. \| Production: hipergo>>>