Overview In today’s competitive environment, service providers cannot risk any interruption in service. Finding a problem before it becomes a hard failure does more than just prevent loss of service, it affords service providers sufficient time to address the problem appropriately. With troubleshooting often posing a large, time-consuming expense, service providers have discovered new methods for nonintrusive test access of fiber circuits. A Value-Added Module (VAM) system equipped with monitor modules provides more flexibility and functionality in a variety of monitoring applications. Customer Premises Module Applications A customer premises VAM can be used as a demarcation point for subscribers requiring fiber feeds. The module slides into a fiber frame and fiber jumpers are subsequently installed from each to the network equipment. Equipped with separate ports for local testing, the module uses splitters to route a portion of the transmit and receive signal to a monitoring port. Technicians then test the signal routed to the port via an external test device. This allows technicians access to both directions of the signal without disrupting service to the customer. (See Figure 1.) Monitor Modules Value-Added Module (VAM) System application note Figure 1 Installed at the customer premises location for troubleshooting fiber feeds without disrupting the service Source MON Customer Premises Module Non intrusive testing in both directions Customer Building BSource Building A Rx Customer MON Customer Source Splitter 90% 10% Splitter 10% 90% Tx Rx Tx Customer Equipment ADC Telecommunications, Inc., P.O. Box 1101, Minneapolis, Minnesota USA 55440-1101 Specifications published here are current as of the date of publication of this document. Because we are continuously improving our products, ADC reserves the right to change specifications without prior notice. At any time, you may verify product specifications by contacting our headquarters office in Minneapolis. ADC Telecommunications, Inc. views its patent portfolio as an important corporate asset and vigorously enforces its patents. Products or features contained herein may be covered by one or more U.S. or foreign patents. An Equal Opportunity Employer 1226580 5/02 Original © 2002 ADC Telecommunications, Inc. All Rights Reserved Web Site: www.adc.com From North America, Call Toll Free: 1-800-366-3891 • Outside of North America: +1-952-938-8080 Fax: +1-952-917-3237 For a listing of ADC’s global sales office locations, please refer to our web site. Dual Monitor Cross-Connect Applications The dual monitor module offers another economical method of providing nonintrusive access to fiber circuits. Dual monitor modules are used in cross-connect configurations in which the outside plant cables are terminated to standard bulkhead adapters and fiber optic terminal equipment cables are terminated at the rear of the monitor module. (See Figure 2.) When the outside plant bulkhead terminations on the front are cross-connected to the fiber optic terminal monitor module, access is gained to both the transmit and receive signals of the circuit and monitoring can be performed with no disruption to service. Figure 2 The OSP cable terminates on a standard connector module; FOT equipment terminates on the rear of the monitor module. Technicians connect the two by installing fiber patch cords between the connector module and the monitor module, completing the cross-connect. Value-Added Module (VAM) System Monitor Modules Tx MON Dual Monitor Module Connector Module IFC Cable Cable Vault Splice Point OSP Cable FOT Termination OSP Termination Fiber Distribution Frame Rx MON Tx Rx Rx Tx FOT Splitter 10% 90% Splitter 10% 90% . Value-Added Module (VAM) system equipped with monitor modules provides more flexibility and functionality in a variety of monitoring applications. Customer Premises. Dual Monitor Cross-Connect Applications The dual monitor module offers another economical method of providing nonintrusive access to fiber circuits. Dual monitor