OFM

The Optical Fiber Monitoring (OFM) uses Optical Time Division Reflectometry (OTDR) to detect link degradation and faults over user-defined spans and thresholds. It returns high-resolution fault location measurements to the network operations center within minutes, which can be further analyzed to pin point exact fault location. This helps user to rectify network fault quickly and efficiently minimizing the network downtime. Featuring a powerful, easy to use configuration interface, the OFM unit can be deployed in a range of applications for in-building and access/metro fiber networks.

It can be housed in a standalone 1 RU 19’’ sub-rack. This unit is interfaced to Element Management Software (EMS) as standalone unit or integrated through the product using the RJ45 NMS port. Featuring a powerful, easy to use configuration interface. Standard OTDR trace file returned by the unit can be analyzed at any point of time offline using the interface.

OFM unit is used for monitoring dark fiber or live fiber carrying customer traffic. OFM inserts out-of-band OTDR signal at 1625nm into live fiber and performs real-time link measurement without affecting performance of live channels.

OFM unit has following key features:

• Monitoring and fault detection:
  • Inserts out-of-band OTDR signal (1625 nm) into live fiber to perform real time link measurement.
  • High-resolution link monitoring up to 30dB spans.
  • 12 independent optical fibers monitored per chassis.
  • On-demand measurement and analysis available.
  • Automated fault detection and fault location.
  • Configurable fault detection threshold.
  • Exports data to Telcordia SR-4731 compatible Standard OTDR Record (SOR) format.

    

OFM - Power specifications

Alarm Relay port

The OFM supports three sets of two pin alarm relays: Critical, Major and Minor. These alarm relays can be configured to form a normally open, alarming on closed circuit. Access to the alarm relays is made through the DB9 Alarm relay on the front of the unit.

Serial port

Serial port uses DB9 female connector and supports RS-232 standard. This port is used for local access. It supports local configuration of the node’s IP address.

OSC port

The OSC SFP port supports both SFP and SFP+ pluggable modules with GbE and 100MbE data rates

Two LEDs on the SFP port indicate RX LOS and TX state.

NOTE: OSC port is not supported for this release.

Craft port

Serial craft port provides direct craft connections bypass the need for a known IP address. Craft connections are used to establish a direct connection to the equipment in order to perform initial configuration of the equipment, including the configuration of an IP address, enabling subsequent Ethernet connections.

The craft serial port uses standard RS232 signals; the pin out allows straight through cables to be used to connect to standard PC serial ports.

Optical ports

OFM unit has 12 optical ports which supports SC/APC connectors. The optical connections are 8-degree angle polish, for 9/125 G.652 single mode fiber.

Reset Button

A recessed reset button provides the opportunity to initiate a warm or cold reset of a device without a management session. The recessed style button requires a tool to activate.

Depressing the button for between 200ms and 5 seconds initiates a warm restart of the main CPU. Depressing the button for more than 5 seconds initiates a cold restart of the entire module. This cold restart has the same effect on the equipment as a "power-on" restart.

Power connector

Electrical power is supplied to the OFM unit through a 5-pin power connector plugged into a power socket located on the front face of the unit. The power connector is connected directly to a -48 V DC power source, or a -48 V AC/DC power adapter. The center pin of the power connector is ground.

The OFM unit is also grounded through a connection between the grounding terminal on the front face of the unit and the mounting grounding solution.

Fan module

The OFM unit is fan-cooled with airflow from front to back and left to right. It has one field replaceable fan module at the front of the chassis, powered through its internal connection to the equipment, and held in place with a thumbscrew. The fan unit pulls air through the chassis from its front faceplate mesh openings.

Temperature thresholds and supported fan speeds are set in the factory and are not user configurable.

Ethernet ports

OFM unit supports 2 RJ-45 DCN ethernet ports (10/100/1000BaseT). These ports share the node’s DHCP or user-assigned IP address. DHCP can be disabled and a static IP address assigned via a command line interface (via the craft ports) or the Multi-Node Manager software.

All Ethernet ports are RJ45 with standard pin outs supporting up to GigE connections, per IEEE 802.3z, with both full and half duplex mode, and auto-negotiation. Auto MDI-X allows the use of straight-through or cross-over cabling.

Two LEDs are provided for each port which indicates link state and traffic.

OFM - Ethernet port LEDs indications

Visual indicators details

LEDs indicate the operating state of equipment (chassis, and ports) without requiring a management session. There are two basic categories of front panel LEDs on the OTDR unit: equipment level LEDs and Port level LEDs.

OFM - Card level LEDs indications

OFM - port level LEDs indications

OFM - Optical specifications