WBN / Engineering worksheets

Engineering worksheets

Build a working record of endpoints, fiber paths, coherent conditions or deployment requirements. Keep the source, the observation and the open question together.

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Endpoint requirements record

Record both hosts, exact module identities, port modes and the requirements that must agree across a link.

Read engineering guide Blank PDF

01 Connection identity

Record the actual installed hardware and software. A form factor or optical-standard name alone does not establish compatibility.

Project / link ID / date / engineer A: device, port and software release Z: device, port and software release A: module marking, revision and serial Z: module marking, revision and serial

02 Electrical and optical requirements

Keep electrical host FEC separate from optical line FEC. Use the exact supported application and lane mapping at each endpoint.

Protocol and intended payload rate A and Z host application / electrical lane rate and count A and Z host FEC setting and source Optical interface / lane mapping / line FEC Connector, fiber count, media and reach requirement Host power class, cooling and temperature requirements

03 Evidence and unresolved conditions

No threshold or compatibility result is implied by completing this record.

Applicable documents: title, revision, page and date Validated host / module combination and test evidence Peer interoperability conditions Open questions, owner and next check

Fiber-path record

Record the physical path, connector positions, polarity, losses and measured continuity between endpoints.

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01 Path and construction

Include every patch, trunk, cassette and adapter. Connector keying, gender and polish are independent attributes.

Project / path ID / route / date A and Z port and connector identity Media: SMF or MMF type / installed length Assembly segments: patch, trunk, breakout, cassette Connector type, polish, pinning / gender and key orientation Jacket / environment / applicable installation requirement

02 Position map and continuity

Record the viewing convention used for every connector. A polarity label cannot replace the end-to-end position map.

A position → Z position mapping / drawing reference Transmit → receive mapping for each active optical lane Continuity method / test equipment / calibration date Inspection and cleaning record for all mating interfaces Measured loss, wavelength and reference method by strand Unused fibers / reserved positions / breakout leg lengths

03 Acceptance evidence

Compare measured values to the documented loss budget and required mapping; do not substitute nominal distance for loss measurements.

Applicable budget and source revision Failed / unresolved positions and next checks As-built drawing, test report and record owner

Coherent planning inputs

Keep exact operating modes, line-system conditions and optical measurements together before evaluating a coherent route.

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01 Endpoint and mode identity

A shared rate or media code does not prove equivalent modes. Record the exact model, revision and application at both ends.

Route ID / date / endpoint identities A and Z module / firmware / source document revision Host framing, multiplexing and electrical lane map Line format, payload, modulation, baud rate and FEC Channel frequency / grid / spacing / filter passband

02 Line system and optical conditions

Record OSNR reference bandwidth, measurement point and receive power together. Receiver sensitivity, overload, monitor range and absolute maximum ratings are separate quantities.

Span losses / amplifier or ROADM stages / filter path Transmit power setting and allowed range Receive signal power and total power, per endpoint Measured OSNR, reference bandwidth, method and location Chromatic dispersion / PMD / mode compensation range Amplifier gain, noise, loading and launch constraints

03 Power, thermal and qualification record

Power can depend on host mapping, line mode and dispersion range. Missing test conditions remain unresolved.

Host power budget and documented mode-specific draw Module case temperature, cold start and cooling conditions Pre/post-FEC error record with time interval and units Interoperability / soak evidence and unresolved limits

Deployment supply brief

Describe phased demand, specifications, qualification evidence and delivery requirements without inventing commitments.

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01 Demand and schedule

Separate physical modules, links and cable assemblies. Quantities here are planning inputs, not a supplier commitment.

Program / site / planning date / owner Rack, pod and site phases with required dates Physical transceiver quantities by model and phase Cable assembly quantities by family and phase Spares / attrition assumptions and demand uncertainty

02 Technical and fulfillment requirements

Use a controlled common specification for each WBN model. Record approved alternatives explicitly.

Required models / specification revisions / approved alternatives Qualification plan / host matrix / acceptance evidence Cable construction, labeling, drawing and packaging needs Delivery destinations / receiving windows / staging requirements Lot traceability and documentation required at receipt

03 Review and open conditions

Commercial terms, warranty and shipment commitments require their applicable documented agreement.

Lead-time assumption, source and last verified date Allocation / schedule dependencies / change control Applicable warranty or agreement reference Unresolved inputs, decision owner and next review date

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