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Provide target prices and acceptable alternatives, if any, to speed up the quotation process.
Quotations are subject to stock availability and may vary with market conditions. Prices and lead times are not guaranteed until a purchase order is confirmed. Ensure your contact details are correct to avoid delays in response.

Step1:Prepare product

Step2:Desiccant Protection

Step3:Vacuum Packaging

Step4:Individual Package

Step5:Anti-collision Filling

Step6:Packaging Box
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2. Some specific products need to reach the minimum order quantity.
3. It may cost additional remote fees for delivery if you are in a remote area.
Currently, our products are shipped through DHL, FedEx, SF, and UPS.
DELIVERY TIME1. Once the goods are shipped, estimated delivery time depends on the shipping methods you chose: FedEx International, 5-7 business days.
2. For in-stock parts, orders normally could be shipped out within 1-2days.
Microchip PM5991B-FEI technical specifications, attributes, parameters and parts with similar specifications to Microchip PM5991B-FEI.
Download datasheets and manufacturer documentation for Microchip PM5991B-FEI.
DIGI-G4 is Microchip's fourth-generation OTN processing solution for next-generation OTN switching and packet-optical transport (POTP/P-OTN), WDM/ROADM, and hyperscale data center interconnect (DCI) equipment. Building on the innovations in Microchip's DIGI-120G, which is widely deployed in service provider and hyperscale data center WAN networks today, DIGI-G4 is a 4x100G multi-service OTN processor, scaling line card capacity by 4x, while reducing power per port by 50 percent,as compared to previous generation OTN processors. DIGI-G4 addresses the requirements of SDN-ready, encrypted optical transport infrastructure. Reusing Microchip's proven, service provider-qualified DIGI family OTN switching software development kit (SDK), DIGI-G4 can be leveraged across multiple applications and equipment platforms, providing OEMs with the lowest risk, fastest time-to-market and lowest cost of development.
Variants available with OTN encryption (PM5990) and without OTN encryption (PM5991).
Benefits for Service Providers & OEMs
• Lowers CAPEX & OPEX of service provider 100G deployments
• High-capacity hybrid packet/OTN switching & aggregation maximizes 100G wavelength utilization
• Universal line card solution simplifies line card inventory management
• Supports hyperscale data center interconnect transport requirements
• Flexible, low latency, protocol agnostic Layer 1 OTN payload encryption
• Flexible on-chip OTN switch & Interlaken interconnects enable design of compact, scalable, ‘rack-and-stack’ data center interconnect WAN transport platforms
• Supports transition to transport SDN-based network architectures
• Flexible hybrid packet/OTN mapping, aggregation & switching enables virtualization of 100G optical infrastructure
• Hitless, on-demand scaling of optical connections
• Features to enable OpenFlow extensions such as network element neighbor discovery
• Accelerates time-to-market & lowers development costs for OEMs
• High-performance, field-proven OTN-SDK built upon the DIGI family code base, allowing OEMs to reuse existing software investments
• ‘Application-centric’ APIs reduce time-to-market by up to 6 months.
• Optimizes power, footprint and cost of line cards:
• Integrated 100G gearbox for direct connect to CFP2, CFP4 and QSFP28 transceivers.
• Connects directly to many off-the-shelf Network Processors & Switch Fabrics
• Integrated PLLs & GCC processor reduces the need for auxiliary components
PM5991B-FEI from Microchip is ready for RFQ submission. Send your target quantity and requirements, and AIChipLink will check current availability, lead time, and quantity-based pricing.
The final price for PM5991B-FEI depends on requested quantity, supply conditions, date code, package option, and destination. An RFQ lets us return the current market quote for your order.
PM5991B-FEI is a Microchip Optical Networking part. Key details include Max SERDES Rates (Gbps): 28 and Max Bandwidth (Gbps): 800; contact us if you need the specifications verified before sourcing.
After you submit the RFQ for PM5991B-FEI, our sales team typically replies within 24 hours with availability, unit pricing, lead time, shipping choices, and possible substitutes.
Once stock for PM5991B-FEI is confirmed, available inventory can generally ship within 1–2 business days. The final schedule depends on quantity, warehouse source, and delivery address.
Yes. If PM5991B-FEI is unavailable, end-of-life, or outside your schedule, we can review comparable Microchip Optical Networking parts and compatible replacement options.
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Listed Part Number3,000+
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In-stock SKU15,000+
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