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Data summary

General This equipment is designed to meet the appropriate sections of ITU-T Recommendations G.664, G.703, G.704, G.707, G.783, G.957, Ethernet-to-SDH schemes of: GFP - G.7041 and LCAS - G.7042, and IEEE802.3


2 x STM-1/STM-4 line interfaces 4 x E1 Tributary interfaces (Balanced or Unbalanced), 4 x Fast Ethernet data interfaces 1 x FastE for Management Access and IP Tunnelling, 1 x RS232 for local LCT access 2 x Auxiliary V.11 (64 kbit/s) 1 x T4 clock output (2 Mbit/s, 2 MHz, SSMB), 1 x T3 clock input 1 x EDI (User I/O: 6 inputs, 2 outputs) 1 x Power Supply (48V with integrated alarm signalling for battery option)

Customer connectors

RJ45, Coax (DIN 1.0/2.3 mm), LC duplex receptacle, 9-SubD type male

Supply voltage

-48V to -60V DC nominal


45 mm high, 450 mm wide, 210 mm deep Battery, Fibre handling, Wall, Desktop or Rack mounting options


Storage: Transport: Operation:

ETSI EN 300 019-1-1 Class 1.2 ETSI EN 300 019-1-2 Class 2.3 ETSI EN 300 019-1-3 Class 3.2


The OMS840 is managed centrally from ServiceOn via Element Management and Network Management systems.

Software download from the central management system facilitates the addition of new features, as the standards of the technologies and services evolve.

The management architecture is partitioned to match operator expertise and organization. The SDH domain provides bearer capacity and the data domain configures and monitors the parameters associated with the data service. Alarm data is automatically shared between the domains.

All units contain both fixed and configurable inventory information, which can be read from the management system.

Efficient bandwidth usage The OMS840 transports Ethernet traffic efficiently over N x VC-12, 3 or 4 channels providing configurable and flexible bandwidth utilization options (via Virtual Concatenation), with the ability to upgrade or downgrade the links in service (via LCAS). LCAS additionally allows the benefit of re-use of protection bandwidth for traffic, and the ability to offer differentiated service classes. Virtual Concatenation allows the best use of network bandwidth via the ability to diversely route traffic, whilst avoiding the need to upgrade intermediate nodes.

Carrier-class reliability and availability The carrier-class reliability inherent in the OMS840 design significantly reduces wholelife costs by minimizing the number of customer site visits needed to maintain service. The carrier-class availability of the OMS840 and the underlying SDH transport mechanism ensures that delivery of Ethernet traffic is as dependable as a conventional telephone call.

Easy installation The OMS840, with its focused functionality and telecommunications equipment base, can be installed without needing costly and specialist skills from outside your traditional sources.

This approach allows different personnel, if required, to be responsible for the different domains without needing knowledge of the other domain. Alternatively, the two domains can be managed via the same systems.

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