Managed Fiber Wide Area Network

Deploy a Managed Multi-Service Fiber WAN with CWDM

This application example illustrates how the iConverter Multi-Service Platform enables the delivery of managed Ethernet and T1 services over a Wide Area Network. The iConverter Multi-Service Platform consists of Network Interface Devices, media converters, transponders, T1/E1 multiplexers and CWDM multiplexers.

The example of a Municipal fiber network is used in this application diagram, but the same topology can be applied to a Campus WAN or a Utility WAN that is deploying Ethernet and T1s. The T1s are used for PBX voice traffic between different departments, and are connected to a Service Provider network at City Hall for outside calls. The Ethernet data is shared throughout the city-wide network, and segregated by department with VLANs.

The top of the application diagram shows the topology of the CWDM network that is used to transport multiple data channels (CWDM wavelengths) over a dual fiber strand that runs the length of the city’s Main Street. At City Hall, T1 circuits from a Service Provider are connected to the central PBX, and a Gigabit Ethernet switch provides connectivity to servers.

OADM-SchematicAn iConverter CWDM MUX is deployed at City Hall to multiplex the five different data channels onto the fiber cable (the Common Fiber Line). The first channel is Gigabit Ethernet transported over the 1470nm wavelength, and the other four channels are T1s (four per channel) using the 1550nm, 1570nm, 1590nm and 1610nm wavelengths. At each municipal building, an iConverter CWDM/AD Add+Drop MUX is used to drop off one channel of Ethernet and one channel of four T1s. The CWDM/AD is an Optical Add+Drop Multiplexer (OADM) that filters out the appropriate wavelengths traversing the CWDM Common Line to be dropped off at each location.

The 2-Channel OADM has Left and Right Channel ports that enable traffic to be terminated at a building using one of the Channel Ports, or travel in both directions along the CWDM common lines using both Left and Right Channel Ports (see the schematic diagram at right). The T1 data channels are terminated at each building using the Channel 1 Left Port. The Ethernet data is shared throughout the network and travels in both directions using the Channel 2 Right and Left ports.

Municipal WAN

The call outs at the bottom of the application diagram show how the iConverter equipment is deployed at the different city departments along Main Street.

At City Hall, an iConverter NMM2 Network Management Module, an xFF transponder, an 8-Channel CWDM/X multiplexer, and four groups of Modular T1/E1 multiplexers are installed in a 2U high 19-Module Chassis. The iConverter NMM2 enables management of the entire network of iConverter equipment using NetOutlook SNMP Management Software. The iConverter xFF is a transponder with two SFP transceiver ports that provides wavelength conversion between the 1310nm fixed fiber interface on the VLAN-capable Ethernet switch and the 1470nm channel port on the CWDM/X MUX.

The iConverter Modular T1/E1 Multiplexers consist of a fiber transport module and a four-port T1 module (up to four T1 modules can be installed alongside a fiber transport module). The fiber transport module digitally multiplexes the T1 circuits onto a fiber link. A CWDM SFP transceiver in the fiber transport module enables connectivity to the channel ports on the CWDM MUX modules.

At the Police Department, the Fire Department and the Courthouse, a 1U high iConverter 5-Module Chassis is deployed with a CWDM A/D Multiplexer, a Modular T1 Multiplexer and two GX/TM2 Network Interface Device (NID) modules. The CWDM A/D provides the Add+Drop functionality described above. The Modular T1 Multiplexer takes the CWDM channel from the Channel 1 Left port on the CWDM A/D module and delivers four T1s via RJ-45 ports that are connected to a department PBX system.

The GX/TM2 NIDs are intelligent media converters with integrated SNMP management that support advanced features, including VLAN, Quality of Service and bandwidth control. The Gigabit Ethernet switches at the department buildings do not support VLAN, so the GX/TM2 NIDs provide the VLAN functionality to segregate the Ethernet data between departments and preserve the investment in the legacy switches. The GX/TM2 NIDs also feature encrypted IP-less management so there are no network IP addresses in the 5-Module Chassis. This improves network security by preventing unauthorized access to the network management.

Two GX/TM2 NID modules are used at the first three departments along the CWDM common lines because the CWDM traffic must travel in both directions, and connect to the Channel 2 Left and Channel 2 Right ports on the CWDM/AD MUX. At the Library, only one GX/TM2 NID is deployed because the Library is the last location along the CWDM Common Line.

This Wide Area Network application demonstrates how the iConverter Multi-Service platform enables new services over an existing network infrastructure without installing new fiber or upgrading legacy network equipment. The iConverter management system reduces operating costs and improves network reliability with remote configuration, performance monitoring and fault management tools.

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