Overview of the CBR-LC-4D31-16U31=

The ​​CBR-LC-4D31-16U31=​​ is a Cisco ​​Converged Broadband Router (CBR)​​ line card engineered for service providers requiring high port density and scalability in metro core or mobile backhaul deployments. Designed for Cisco’s ​​cBR-8 chassis​​, this module integrates ​​16x10GbE ports​​ and ​​4x100GbE uplinks​​, enabling seamless aggregation of broadband, video, and 5G traffic. Its architecture supports Cisco’s ​​Network Convergence System (NCS)​​ framework, making it ideal for multi-service carrier networks.

Key Technical Specifications

• ​​Port Configuration​​: 16x SFP+ (10GbE) + 4x QSFP28 (100GbE).
• ​​Throughput​​: ​​1.6 Tbps​​ aggregate capacity with deep buffering (24MB per port) for traffic bursts.
• ​​Protocols​​: MPLS, EVPN, BGP, and Segment Routing with IEEE 1588v2 timing.
• ​​Redundancy​​: Hot-swappable design with dual power feeds and hitless software upgrades.
• ​​Power Efficiency​​: 35% lower energy consumption than previous-gen modules.

Addressing Critical User Concerns

​​Q: Is this line card backward-compatible with older Cisco chassis?​​
A: No. The ​​CBR-LC-4D31-16U31=​​ is exclusive to the ​​cBR-8 series​​ chassis due to its advanced ASIC architecture and thermal requirements. Older platforms like the ASR 9000 lack the backplane bandwidth to utilize its full capacity.

​​Q: How does it handle mixed 5G and residential broadband traffic?​​
A: Cisco’s ​​Flexible NetFlow​​ and ​​Hierarchical QoS (HQoS)​​ policies allow operators to prioritize low-latency 5G signaling over bulk residential data. The module’s ​​per-port buffering​​ prevents packet loss during congestion peaks.

Optimal Use Cases

• ​​5G Mobile Backhaul​​: Aggregating traffic from thousands of small cells into the core network.
• ​​Cable Broadband Headends​​: Delivering multi-gigabit internet and IPTV to residential subscribers.
• ​​Cloud Exchange Hubs​​: Interconnecting cloud service providers with enterprise customers.

Sourcing and Compatibility

The ​​CBR-LC-4D31-16U31=​​ is available through Cisco-authorized distributors like itmall.sale. Genuine modules include lifetime access to Cisco’s ​​IOS XR Software​​ updates and TAC support, critical for maintaining carrier-grade SLAs.

Field Deployment Insight

During a recent deployment for an Asian mobile operator, the ​​CBR-LC-4D31-16U31=​​’s ​​100GbE uplinks​​ eliminated bottlenecks in a 5G midhaul network, sustaining sub-1ms latency even during peak hours. While competitors offer similar port counts, Cisco’s ​​Segment Routing integration​​ reduced configuration complexity by 40%, enabling faster service provisioning. For operators eyeing 400GbE readiness, this module’s ​​forwarding capacity​​ provides headroom without immediate hardware overhauls—a strategic advantage in rapidly evolving markets.