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FLASHWAVE CDS HD32 OTN Muxponder
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Mid-Span Meet Applications
A “meet point” or a “mid-span meet” is a demarcation point between two service providers, and the point at which traffic passing between the two
providers is handed off from one to the other. This is typically implemented between separate central offices owned by each of the two carriers,
although it can also be set up in a co-location cage owned by one of the carriers and located on the other’s premises.
This handoff is generally implemented using an agreed-upon protocol, from which a tariff is defined to cover the specifications of the handoff and
the billing agreement between the two carriers.
OTN: The Protocol of Choice for Mid-Span Meet Applications
OTN (Optical Transport Network) is quickly becoming the protocol of choice for this handoff. OTN provides a standard that can easily be followed,
and it provides OAM capabilities that enable each carrier to isolate portions of the network to facilitate investigation of faults. OTN technology also
ensures that management data can flow transparently across multiple vendors.
A particular tier 1 carrier is suggesting an OTU2 connection as the preferred meet-point protocol. To provide this connection, they have suggested
the FLASHWAVE® CDS Micro Packet Optical Networking Platform (ONP) populated with the OTN switch element, the HD32 OTN muxponder plug-in
units, as the equipment for the second carrier’s side, since it has been proven by this tier 1 carrier to interoperate with their network.
Topologies and Protocols
The handoffs can take several different forms, but for this particular mid-span meet application, an OTU2 is required. However, this OTU2 can use
one of several possible configurations. It could be a protected interface, it could be over a wideband interface, or it could be over a DWDM
interface. This application note provides specific examples of some of these handoff interfaces.
Mid-span
Meet
Tier 1
FLASHWAVE
CDS
OTU2
DWDM Filters
Independent
Carrier
OTU2
HD32 OTN Mux
FLASHWAVE
CDS
HD32 OTN Mux
Figure 1: Unprotected Mid-Span Meet
Mid-span
Meet
Tier 1
FLASHWAVE
CDS
HD32 OTN Mux
OTU2
Independent Carrier
OTU2
DWDM Filters
FLASHWAVE
CDS
HD32 OTN Mux
Figure 2: Protected Mid-Span Meet
Figure 1 and 2 illustrate the application with narrowband mux and demux. These same protected and unprotected configurations can also be
implemented with just wideband or gray optics.
On the independent carrier side, the advantage of using the FLASHWAVE CDS platform in this application is that the tier 1 carrier is already using
the FLASHWAVE CDS or FLASHWAVE 7500 platform in many applications, as the meet-point on their side. The FLASHWAVE CDS shelf has been fully
tested and qualified by a specific tier 1 carrier, who is therefore familiar and comfortable with these configurations.
Mid-Span Meet Applications
Figure 3 shows a FLASHWAVE CDS platform in both locations. This application has the added advantage of a 25 dB loss budget.
25 dB Loss Budget
Mux/Demux
FLASHWAVE
CDS
HD32 OTN Mux
Gig E
OC-3
OC-12
OC-48
Mux/Demux
Working Path
OTU2
10.7 Gbps
FLASHWAVE
Mux/Demux
Mux/Demux
HD32 OTN Mux
7120
OTU2
10.7 Gbps
Protection Path
FLASHWAVE
Tier 1
CDS
10.7 Gbps
FLASHWAVE
7120
OTU2
10.7 Gbps
FLASHWAVE
OTU2
Independent
Carrier
FLASHWAVE
7120
Gig E
OC-3
OC-12
OC-48
7120
Figure 3: FLASHWAVE CDS to FLASHWAVE CDS
In figures 4 and 5, the illustration shows the FLASHWAVE CDS platform in the tier 1 office while the independent carrier is utilizing either the
FLASHWAVE 7500 SAS, which is the small FLASHWAVE 7500 shelf, or it uses the standard-size FLASHWAVE 7500 ROADM.
18 dB Loss Budget
Mux/Demux
FLASHWAVE
CDS
HD32 OTN Mux
Mux/Demux
Working Path
OTU2
OTU2
10.7 Gbps
10.7 Gbps
FLASHWAVE
FLASHWAVE
Mux/Demux
Mux/Demux
7120
OTU2
10.7 Gbps
FLASHWAVE
7500
SAS
SMC1 OTN Mux
7120
OTU2
10.7 Gbps
Protection Path
Tier 1
FLASHWAVE
Independent
Carrier
FLASHWAVE
7120
7120
Figure 4: FLASHWAVE CDS (Tier 1) to FLASHWAVE 7500 SAS
18 dB Loss Budget
Mux/Demux
FLASHWAVE
CDS
HD32 OTN Mux
Mux/Demux
Working Path
OTU2
OTU2
10.7 Gbps
10.7 Gbps
FLASHWAVE
FLASHWAVE
Mux/Demux
Mux/Demux
7120
OTU2
10.7 Gbps
FLASHWAVE
7500
ROADM
SMC1 OTN Mux
7120
OTU2
10.7 Gbps
Protection Path
Tier 1
FLASHWAVE
7120
FLASHWAVE
7120
Figure 5: FLASHWAVE CDS (Tier 1) to FLASHWAVE 7500 ROADM
Independent
Carrier
Mid-Span Meet Applications
In Figure 6, the tier 1 carrier is using the FLASHWAVE 7500 ROADM and the independent carrier is using the FLASHWAVE CDS HD32 OTN Muxponder.
18 dB Loss Budget
Mux/Demux
FLASHWAVE
7500
ROADM
SMC1 OTN Mux
Mux/Demux
Working Path
OTU2
OTU2
10.7 Gbps
10.7 Gbps
FLASHWAVE
FLASHWAVE
Mux/Demux
Mux/Demux
7120
OTU2
10.7 Gbps
FLASHWAVE
CDS
HD32 OTN Mux
7120
OTU2
10.7 Gbps
Protection Path
Tier 1
FLASHWAVE
7120
FLASHWAVE
7120
Independent
Carrier
Figure 6: FLASHWAVE 7500 ROADM (Tier 1) to FLASHWAVE CDS OTN Muxponder (independent carrier)
Advantages of the FLASHWAVE CDS Micro Packet ONP
The FLASHWAVE CDS platform is a very simple system that can provide the full functionality needed for the required handoff. It consists of three primary
components: the shelf, the fan unit, and the two HD32 OTN Muxponder cards. These three elements provide all the basic functionality required for the
handoff. The only additional components needed are the optics between the systems, such as wideband or CWDM XFPs.
T he FLASHWAVE CDS platform with the HD32 OTN switch/muxponder card also adds other value that can make the handoff easier from the tier 1
carrier.
• The OTU2 is a universal handoff for services such as OC-3, OC-12, OC-48,
and Gigabit Ethernet.
• The OTN OAM functionality allows simple SONET-like management of the
signals, enabling loopbacks and PBRS testing capabilities.
• The system provides full transparency for SONET protocols, which
eliminates concern about a three-layer management stack or a seven
layer OSI management stack.
• This is a proven and tested system by the tier 1 carrier and is
recommended by them.
• A handoff between two FLASHWAVE CDS shelves has the advantage of
additional optical gain.
• The FLASHWAVE CDS platform is environmentally hardened and can be
put into an unconditioned outside-plant cabinet.
• This application can utilize either D/CWDM or wideband optics.
XFP Modules for OTU2 Handoff
The FLASHWAVE CDS HD32 OTN Muxponder supports two pluggable network XFPs. These can be any combination of the following:
CWDM – Eight individual XFPs that each support a
specific wavelength
• 1471 nm, 1491 nm, 1511 nm, 1531 nm, 1551 nm, 1571 nm,
1591 nm, 1611 nm
• Optical loss budget = 24–26 dB depending on specific wavelength
required
• Not including loss through passive filters
• Temperature-hardened optics from –40 +65 °C
• Typically used in outside-plant applications
DWDM – Single tunable XFP across 88 wavelengths
• Supports wavelengths from 1528.773–1563.455 nm
• Optical loss budget = 25 dB
• Not including loss through passive filters
• Not temperature-hardened (0 to +50 °C)
• Used in interoffice facilities and outside-plant controlled environments
Wideband – SR-1, IR-2 and LR-2 XFP options
• Optical Loss budget = 6 dB (SR-1), 13 db (IR-2), and 24 db (LR-2)
• Temperature-hardened optics from –40 to +65 °C
• Used in interoffice facilities and outside-plant controlled environments
Configuration Details
Although in many instances the Fujitsu FLASHWAVE 7120 Packet ONP is used in C/DWDM applications, specific configurations vary. Discuss the specifics
of any bill of materials with your service provider partner.
Fujitsu Network Communications Inc.
2801 Telecom Parkway, Richardson, TX 75082
Tel: 888.362.7763
us.fujitsu.com/telecom
© Copyright 2013 Fujitsu Network Communications, Inc.
FLASHWAVE® is a trademark of Fujitsu Network Communications Inc. (USA).
FUJITSU (and design)® and “shaping tomorrow with you” are trademarks of Fujitsu Limited
in the United States and other countries. All Rights Reserved.
All other trademarks are the property of their respective owners. Configuration requirements for certain uses
are described in the product documentation. Features and specifications subject to change without notice.
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