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The Value of
Non-Intrusive Core Router Monitoring
ADC's Value-Added Module (VAM) Solution
Executive Summary
The evolution of Internet Protocol (IP)−based technology, coupled with
advances in core-routing technology, is changing the way telecommunications
carriers deliver once disparate services to their customers. Enabled by an
IP/Multiprotocol Label Switching (MPLS) technology, next-generation routers
are designed to support multiple applications and services including combined
voice, video and data. Core routers today harness incredible power, supporting
aggregate throughput of 92 terabits and supporting speeds up to OC-768.
Given the advances in core router technology and their important role in
the telecommunications architecture, the ability to non-intrusively monitor
performance across every type of core router application is key to isolating
problems, maintaining service levels and mitigating risks.
This paper addresses why telecommunications carriers need the ability
to non-intrusively monitor the core router and best practices are for
monitoring. In addition, the paper discusses ADC’s Value-Added Module
(VAM) monitoring solution, ADC’s Professional Services role in deploying
core router VAM solutions and highlights a successful implementation for
a major telecommunications carrier.
The Value of Non-Intrusive Core Router Monitoring
Page 2
The Network Core
The evolution of IP-based technology continues to
drive telecommunications carriers to provide next-
generation, converged IP services against a backdrop of
ever increasing bandwidth and performance demands.
Packet-based network infrastructures that support high-
speed Internet, video on demand (VoD), and Voice over
IP (VoIP) services require telecommunications carriers
to upgrade their network architectures to meet the
challenges of networking convergence and multiservice
delivery. At the heart of network migration and
architecture upgrades lay massive core routing solutions
designed to meet the growing demands of the carrier’s
customer base. These high-end routers, geared toward
telecommunications companies with networks that
handle the greatest levels of Internet traffic, represent
the phasing out of multiple single-service networks.
What have emerged are single, integrated networks
capable of delivering disparate services and applications
at unprecedented speeds and performance levels.
Advances in Core Router Technology
Driven by MPLS technology that leverages the
integration of IP and dense wavelength division
multiplexing (DWDM), next-generation routers are
designed to support converged network services.
Today’s core routers, supporting aggregate throughput
of 92 terabits and of up to OC-768, enable carriers to
deliver a suite of data, voice, and video services over
highly available and highly scalable IP infrastructures
that are well-suited for network expansion. Given the
advances in core-router technology and its important
role in the telecommunications architecture, the ability
to perform out-of-band monitoring without disruption
in service is necessary for telecommunications carriers
seeking to isolate problems, maintaining service levels,
and mitigate risks.
Limitations of Built-in Core Router Monitoring
Before next-generation core routers entered the scene,
telecommunications carriers were forced to rely on
multiple routers to assure redundancy and mitigate
risk. Carrier-grade core routers today are designed
with safeguards in place to prevent system crashes
and failures. Core routers incorporate elaborate alarm-
reporting systems, as well as other fault management
features, which alert administrators when thresholds
related to signal loss or signal degradation are crossed
or the system is operating outside a predetermined
service range. Such features are not intended to provide
troubleshooting functionality or advanced performance
diagnostics; rather they are intended to offer high-level
performance data and some trend analysis.
Carriers today are looking for advanced diagnostic
capabilities to enhance core router monitoring
functionality. Given the complexity of today’s
telecommunications networks, carriers must be able
to efficiently identify problems and diagnosis IP, video,
and voice faults - all of which require the ability, for
example, to examine packet levels using third-party
point-monitoring or analysis solutions.
Monitoring the Essential Core
– Taking it to the Next Level
Customers impose extremely high demands on network
carriers to not only deliver high performance, but to
ensure guaranteed service levels to customers across
a variety of industries—including financial, medical
and emergency services. Carriers are routing precious
signals at incredibly high rates through the core. If a
problem arises, the entire network can be at risk. To
remain competitive and satisfy customer agreements,
carriers must be able to troubleshoot problems quickly,
as well as conduct in-depth analysis at the packet level.
Detailed monitoring requires real-time, in-depth visibility
into network traffic, and is necessary for effective risk
mitigation and service-level management.
Enabling Advanced Monitoring
Since the introduction of the next-generation routers,
telecommunications carriers have sought real-time
monitoring functionality. With improved monitoring
functionality, time-consuming and expensive
troubleshooting can be easily averted. The ability to
non-intrusively monitor (i.e., without taking service
down) means telecommunications carriers are able to:
• Provide validation of service-level agreements (SLAs)
without disruption of the network (i.e., obtain end-
user data necessary to monitor end-to-end business
services and SLA compliance).
• Isolate problems and determine whether the
source of the problem resides with the carrier or
customer’s network.
• Enable the measurement of network performance
based on throughput and latency without circuit
disruption.
• Demonstrate effective service delivery via third
party diagnostics that can compile information
and provide reporting and advanced business
intelligence reporting.
Effective Practices for Core Router Monitoring
Best practices for monitoring the core router should
include the following:
• Enable real-time, out-of-band monitoring with non-
intrusive circuit access and signal splitting for testing
and troubleshooting without service disruption.
• Establish a test point that is separate from, or outside
of, the core router equipment so that problem
The Value of Non-Intrusive Core Router Monitoring
Page 3
identification and isolation can occur without the
influence of any active equipment.
• Enable testing, diagnostics and analytics of a small
percentage of the actual signal via third-party
equipment that is location independent.
• Monitor signals in both directions (i.e., transmit and
receive).
• Locate monitoring ports/bays in close proximity to the
core router and monitor all inputs and outputs.
ADC’s Value-Added Module
System: Monitor Modules
In today’s competitive environment, telecom carriers
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.
Deploying a Value-Added Module (VAM) system adjacent
to the core router provides needed flexibility and
functionality in a variety of monitoring applications.
ADC VAM Monitor Modules
Features and Benefits
Service providers can deploy a monitor module as a
non-intrusive tap port for monitoring purposes or for
out-of-band testing. The ADC VAM monitor module
is a platform for adding monitor functionality to fiber-
distribution frames. The VAM module splits the signal
at the physical layer and delivers a small percentage of
the signal to active or passive test equipment for out-of-
band analysis or problem isolation. ADC VAM Monitor
Modules enable out-of-band monitoring, test access and
signal splitting, in modular plug-and-play packaging.
Benefits of ADC’s VAM solution include the following:
• Non-intrusive monitoring and signal access solution.
Using an ADC VAM, a percentage of the signal or
designated wavelength is diverted to a monitor port
or external test equipment, while the remaining signal
or wavelength passes through the network without
interruption. Once the signal or wavelength is peeled
off, it can be relayed via a fiber jumper to a network-
monitoring center where third-party equipment can
perform simple testing or more elaborate analysis and
diagnostics (see Figure 1 for a splitting example). By
utilizing such a small percentage of the actual signal,
there is no significant signal loss or degradation of
service, meaning it is non-intrusive. The ability to non-
intrusively monitor enables providers to troubleshoot
networks without disrupting customer service.
• Access to both Tx and Rx signals. ADC’s VAM “bay”
provides a monitoring point for both transmit and
receive signals or any variation of transmit and receive.
The ability to easily monitor both directions from both
ends of a fiber span greatly reduces the time necessary
to locate failures or degradation points.
• Flexible, highly configurable platforms. ADC VAM
solutions are configurable for any telecommunications
carrier environment, and are available in many
different chassis styles (e.g., Micro VAM, LGX style
VAM, wide VAM, FDF VAM and others). VAMs
are ideal for core-router applications, as well as
demarcation-point applications. VAM monitoring
ports can be used to route signals for long-term
analysis in centralized diagnostic centers or they
can be used to provide access for on-site diagnostic
equipment or test gear.
• Cost effective solution. Carriers have the ability to
monitor core-router performance, a well as diagnose and
troubleshoot problems without disrupting service and
without increasing operational and maintenance costs.
• Flexible coupler and interface configurations. The
VAM can incorporate any variation on the number
of monitoring/test ports in multiple configurations,
enabling easy deployment and access. Various
combinations of all-front access to input/output ports
or rear access to both input/output ports are also
available (see Figure 2).
Rear Front
Connectorized
Pigtail
Adapter Port
Adapter
Port
Optical
Components
Connectorized
Pigtail
(3 mm Jacketed)
Bare Pigtail
(2 mm Jacketed)
OSP
Cable
OSP VAM
Core
Router
Splice
Test
Eq
Splitter
Splitter
Rx
Tx
Rx
Tx
10%
90%
10%
90%
Figure 1. Illustration of non-intrusive core router
monitoring and signal access.
Figure 2. VAM monitor modules can be tailored to meet
application requirements. Modules include most industry
standard single-mode and multi-mode connectors. Most
inputs and outputs use adapter, pigail or bare fiber.
WHITE PAPERWHITE PAPER
Implementing ADC Monitoring Solutions –
ADC Professional Services
In response to the growing requirement to enable advanced core router monitoring, ADC
Professional Services is designing ADC VAM monitoring solutions to fit virtually any carrier
router implementation. When a new router is installed, more often than not, so is the ADC
VAM non-intrusive monitoring solution. For existing core router environments, APS can
integrate a VAM solution, regardless of vendor, service, or technology. ADC equipment is
extremely flexible and configurable, and can map to any fiber frame footprint (e.g., Next
Generation Frames (NGF), LGX-style frames, Optical Distribution Frames (OMX), and others).
Telecom Carrier Core Router VAM
Implementation
ADC Professional Services recently deployed a VAM solution on a Cisco CRS-1 for a major
national telecommunications carrier. The challenge for the carrier was the desire to examine
packet levels. The CRS-1 incorporates alarming features for power failure and signal
degradation and can monitor routing capacity and speed, but does not perform analyses at
the packet level to the extent as required by the carrier. The VAM solution deployed (called the
Monitor X-Connect in Figure 3) enables the carrier to peel off a piece of the signal and pass it
to third-party packet-analyzing equipment (called Monitoring Equipment in Figure 3) without
any disruption or interference with the circuit.
Service Level Agreements with customers typically dictate finite performance levels, including
acceptable latency and throughput. Any degradation of service that the carrier causes can
result in serious financial ramifications, particularly when the customers are huge enterprises
with complex, high-performance networks. The ability to monitor optical signals off the core
router can enable the determination of the root cause of problems before they manifest
themselves in actual service outages. Coupled with VAM monitoring solutions located at the
furthest customer demarcation points, VAM solutions can provide considerable efficiency in
troubleshooting network problems.
Figure 3. VAM monitor module
deployment on a CRS-1, 9-panel
LGX, carrier configuration.
Monitor X-connect
AC/front/rear
9 Panel LGX Complex
-2 panels per CRS1
(96 ports)
-1 panel for cross-connect
to monitoring equipment
Monitoring
Equipment
90/10
90/10
90/10
90/10
CRS-1
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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.
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104775AE 5/07 Original © 2007 ADC Telecommunications, Inc. All Rights Reserved
. Practices for Core Router Monitoring
Best practices for monitoring the core router should
include the following:
• Enable real-time, out-of-band monitoring. Built-in Core Router Monitoring
Before next-generation core routers entered the scene,
telecommunications carriers were forced to rely on
multiple routers
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