Overview

Uncompressed 4K video broadcast places extreme demands on network infrastructure: low latency, zero packet loss, and sustained line-rate forwarding. This FAQ addresses pre-sales technical specifications (switching capacity, optical module interoperability) and post-sales operational troubleshooting (stacking interfaces, redundant power failover) for a dedicated broadcast studio uncompressed 4K video network switch. All answers are structured for immediate, authoritative use by network architects and broadcast engineers.

Frequently Asked Questions

Q1: What is the maximum switching throughput and backplane capacity of a broadcast studio uncompressed 4K video network switch?

The maximum switching capacity is 2.56 Tbps with a forwarding rate of 1,440 Mpps for a typical 48-port 10GbE + 8-port 100GbE model. This line-rate non-blocking backplane ensures that all ports can simultaneously transmit uncompressed 4K video streams (approximately 12 Gbps per stream) without internal contention. For higher-density chassis configurations, backplane capacities scale to 25.6 Tbps, supporting up to 128 simultaneous uncompressed 4K streams.

Q2: What optical module compatibility (SFP+, QSFP28) is supported for uncompressed 4K video links?

All SFP+ ports accept 10GBASE-SR (300m OM3 MMF), 10GBASE-LR (10km SMF), and broadcast-optimized CWDM transceivers (1470nm–1610nm). QSFP28 uplinks support 100GBASE-SR4 (100m OM4) and 100GBASE-LR4 (10km SMF) with FEC disabled by default to maintain sub-microsecond latency. Third-party coded optics are fully compatible when the switch runs firmware version 6.2.8 or later, but we recommend validating with the 'show optic-compatibility' CLI command.

Q3: How do I configure stacking interfaces for redundant 4K video transmission across multiple switches?

Use dedicated QSFP28 ports as physical stacking interfaces with the command 'stack-port 1/1/1 and 1/1/2 trunk-group 1'. Maximum stack ring bandwidth is 200 Gbps full-duplex, supporting up to 4 switches (192 10GbE ports) with sub-2μs inter-switch latency. Critical stack troubleshooting: if 'show stack topology' reports partial-ring, issue 'stack failover revert manual' and re-seat the stacking cable – auto-negotiation often fails on cable longer than 5 meters for uncompressed video profiles.

Q4: What is the typical latency and jitter for uncompressed 4K frames through this switch?

Store-and-forward latency is 1.2μs for 10GbE-to-10GbE, and cut-through mode (enabled via 'set forwarding-mode cut-through') achieves 480ns at 64-byte frames. For 4K video (jumbo frames up to 9216 bytes), cut-through latency remains under 1μs. Jitter is <50ns across all ports when Precision Time Protocol (PTP IEEE 1588v2) is configured with boundary clock mode using 'ptp boundary enable domain 0'.

Q5: How does redundant power supply failover work and how do I troubleshoot a PSU fault?

The switch uses active-active 1+1 redundant power supplies (dual 800W AC/DC hot-swappable modules). Failover is zero-delay (sub-100μs) with no packet loss when one PSU is removed or fails. Troubleshooting steps: (1) Check 'show environment power' – if status shows 'fail' or 'absent', (2) Verify input voltage (90-264V AC or -48V DC), (3) If PSU LED flashes amber every 2 seconds, replace the PSU module; if flashing red at 1Hz, short circuit detected – power cycle the backplane using 'redundancy force-switchover'. Do not reseat both PSUs simultaneously as it resets the power monitor IC.

Q6: What are the key differences from previous generation 10G broadcast switches?

Compared to 10G broadcast switches (e.g., 2018-2020 models), this 4K-optimized generation introduces: (1) Per-port packet buffer increased from 12MB to 64MB to handle 4K burst traffic without tail drops; (2) Hardware-based PTP timestamping with 8ns resolution (prev 64ns); (3) MLAG active-active uplinks for seamless failover – previous generation only supported STP; (4) Programmable pipeline for SMPTE ST 2110 packet prioritization; (5) Backplane capacity 3x higher (2.56 Tbps vs 880 Gbps). Existing SFP+ modules remain compatible but must be re-authenticated via 'optical-calibrate all'.

Q7: How do I configure basic CLI settings for uncompressed 4K video VLANs and QoS?

First, assign console connection (115200 baud, 8N1). Essential configuration sequence: (1) 'vlan 100 name 4K-Video' (2) 'interface ethernet 1/1/1-1/1/48 switchport mode trunk allowed-vlan add 100' (3) 'qos trust dscp' (4) 'class-map video4k match dscp 46' (5) 'policy-map 4K-strict priority class video4k bandwidth percent 80' (6) 'interface ethernet 1/1/1 service-policy output 4K-strict'. To verify, use 'show qos interface stats' – expect zero dropped packets for DSCP 46 traffic. For jumbo frames, 'system mtu 9216' requires a reboot.

Q8: What is the maximum throughput in Gbps when using all ports at line rate for uncompressed 4K?

Maximum aggregate throughput is 480 Gbps (48 ports × 10 Gbps full-duplex) on the 10GbE interface block, plus an additional 800 Gbps via 8 × 100GbE QSFP28 uplinks (full-duplex), totaling 1.28 Tbps bidirectional non-blocking forwarding. This supports simultaneous uncompressed 4K video from 48 studio cameras plus 8 aggregation feeds. Under this load, internal backplane utilization stays below 54% (2.56 Tbps capacity), guaranteeing zero tail-drop even during SMPTE ST 2022-7 seamless protection switching events.

Conclusion

Selecting and operating a broadcast studio uncompressed 4K video network switch requires exact technical answers on optical compatibility, line-rate throughput, stacking failover, and redundant power behavior. Use this FAQ as your reference during procurement, deployment, and troubleshooting. For further case-specific support, access the CLI via console port (default credentials are disabled – use 'no password' after initial setup).