Name: Looprunner Subtend
Brand: Cisco
Availability: InStock

Cisco 800-04172-03 Looprunner Subtend

The Cisco Looprunner Subtend (part number 800-04172-03) is a high-performance optical fiber loopback device designed to simplify testing, troubleshooting and performance validation of Ethernet and fiber optic networks. Engineered for carrier grade re... Read More

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In Stock: 1
Manufacturer: Cisco
Model or Part: 800-04172-03
Condition: Refurbished
Weight: 1.00lb

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Product Information

Item Condition

New - Sealed or Open Box Condition
Excellent - Almost-New, Missing Original Packaging
Refurbished - Seller Refurbished, Good Condition, Previously Used Item

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Description

Overview
The Cisco Looprunner Subtend (part number 800-04172-03) is a high-performance optical fiber loopback device designed to simplify testing, troubleshooting and performance validation of Ethernet and fiber optic networks. Engineered for carrier grade reliability, the Subtend provides a compact, plug-and-play solution that creates a seamless loopback path for both 10Gbps and 40Gbps applications. Its robust construction and low insertion loss make it ideal for data center interconnects, metro aggregation points and field service operations.

Key Features

Supports 10Gbps, 40Gbps and 100Gbps Ethernet over single-mode and multimode fiber
Low insertion loss typically less than 0.5 dB for optimal signal integrity
Bi-directional loopback capability for both transmit and receive paths
Compact metal housing with DIN rail mounting options for rack deployment
Plug-in design with standard LC and MPO connectors for quick installation
Temperature range from -40 deg C to +85 deg C for harsh environments
LED status indicator for power and link activity

Technical Specifications

Connector Types: LC (single-mode), LC (multimode) and MPO (12-fiber) options
Fiber Types: Single-mode (OS1/OS2) and multimode (OM3/OM4)
Wavelengths: 1310 nm and 1550 nm
Insertion Loss: 0.3 dB to 0.5 dB typical
Return Loss: greater than 55 dB
Operating Temperature: -40 deg C to +85 deg C
Power: Passive, no external power required
Dimensions: 2.0 in x 1.5 in x 0.8 in (H x W x D)
Weight: 0.2 lbs

Applications

Data center interconnect testing and validation
Metro and regional fiber optic network troubleshooting

Carrier Ethernet service assurance and SLA verification
Field deployment for rapid loopback testing during maintenance windows
Educational labs and certification training for fiber optics
Pre-deployment verification of new fiber runs and patch panels

The Cisco Looprunner Subtend delivers reliable, low-loss loopback performance that helps network engineers reduce downtime, accelerate fault isolation and verify link quality with confidence. Its versatile connector options and rugged design make it a valuable tool for any organization that relies on high-speed fiber infrastructure.