Tunability in DWDM has been a key requirement for the technology's maturity over the years from the introduction of tunable lasers, broadband receivers, and variable gain amplifiers. The Cisco® ONS 15454 MSTP now extends DWDM tunability to the dispersion compensator with its Tunable Dispersion Compensation Unit (see Figure 1). The Cisco ONS 15454 Tunable Dispersion Compensation line card uses fiber as the underlying technology to achieve tunability, which allows it to be unlocked from a specific 100/50 GHz grid like fiber bigrating and etalon technologies require. This helps service providers avoid future modifications to their DWDM networks to accommodate new wavelength modulation schemes that don't fit into fiber bigrating or etalon spectral widths.
Figure 1. Cisco ONS 15454 Tunable Dispersion Compensation Unit
Manageability
Previous generations of dispersion compensators were passive units that sat outside of the chassis, making it very hard to know which unit type existed at each point in the network. With the Tunable Dispersion Compensation Unit as a plug-in module for the Cisco ONS 15454 chassis, operators will know exactly how much dispersion compensation exists throughout the entire network from a single remote location (see Figure 2).
Network Turn-Up
The Cisco ONS 15454 Tunable Dispersion Compensation Unit allows service providers to reduce their operational costs by providing flexible points in the network to cope with design uncertainties. As service providers may or may not know exact fiber data, the Cisco ONS 15454 Tunable Dispersion Compensation Unit helps ensure that the dispersion map can be adjusted without major modifications throughout the network (see Figure 2).
Figure 2. Remote Dispersion Management
Features and Benefits
The Cisco ONS 15454 Tunable Dispersion Compensation Unit provides the following customer benefits:
• Automatic provisioning from the Cisco Transport Planner
• Remote monitoring and alarm correlation
• Network auditing: Provides the ability to validate dispersion maps remotely
• Fewer spare units: A single T-DCU replaces 10 fixed units
• Broadband compensation wavelength number- and speed-independent
Tables 1 through 3 provide optical and mechanical specifications for the Cisco ONS 15454 Tunable Dispersion Compensation Unit. Table 4 provides regulatory compliance information, Table 5 lists system requirements, and Table 6 gives card specifications.
Table 1. Cisco ONS 15454 Tunable Dispersion Compensation Optical Specifications
Optical Specification
Coarse Unit (15454-TDC-FC=)
Fine Unit (15454-TDC-FC=)
Wavelength Range
1529 nm - 1562.5 nm
1529 nm - 1562.5 nm
Optical Return Loss
45 dB
45 dB
Polarization Dependent Loss
0.3 dB
0.3 dB
Maximum Insertion Loss
12.5 dB
9.5 dB
Chromatic Dispersion Range
-110 ps/nm thru -1650 ps/nm
-45 ps/nm thru -675 ps/nm
Chromatic Dispersion Steps
-110 ps/nm
-45 ps/nm
Maximum Fiber Length
10.58 km
4.41 km
Maximum Polarization Mode Dispersion
0.85 ps
0.63 ps
Tuning Settling Time
5 ms
5 ms
Table 2. Coarse Tunable Dispersion Compensation Unit Permutation Table
Coarse Unit
Chromatic Dispersion (ps/nm)
Maximum Insertion Loss (dB)
Maximum PMD (ps)
Maximum Fiber Length (km)
0
2.4
0.10
0.03
-110
3.6
0.16
0.73
-220
4.0
0.19
1.44
-330
5.2
0.23
2.15
-440
4.7
0.23
2.83
-550
5.9
0.26
3.54
-660
6.2
0.28
4.25
-770
7.4
0.31
4.96
-880
6.1
0.26
5.65
-990
7.3
0.29
6.36
-1100
7.7
0.31
7.07
-1210
8.9
0.34
7.77
-1320
8.4
0.33
8.46
-1430
9.6
0.36
9.17
-1540
9.9
0.37
9.87
-1650
11.1
0.39
10.58
Table 3. Fine Tunable Dispersion Compensation Unit Permutation Table
Fine Unit
Chromatic Dispersion (ps/nm)
Maximum Insertion Loss (dB)
Maximum PMD (ps)
Maximum Fiber Length (km)
0
2.4
0.10
0.02
-45
3.5
0.13
0.32
-90
3.6
0.15
0.61
-135
4.7
0.18
0.90
-180
3.8
0.18
1.19
-225
4.9
0.20
1.49
-270
5.0
0.21
1.78
-315
6.1
0.23
2.08
-360
4.4
0.22
2.35
-405
5.5
0.24
2.65
-450
5.6
0.25
2.94
-495
6.7
0.26
3.24
-540
5.8
0.26
3.53
-585
6.9
0.28
3.82
-630
7.0
0.29
4.11
-675
8.1
0.30
4.41
Table 4. Regulatory Compliance
Countries Supported
ANSI System
ETSI System
• Canada
• United States
• Korea
• Japan
• European Union
• European Union
• Africa
• CSI
• Australia
• New Zealand
• China
• Korea
• India
• Saudi Arabia
• South America
EMC (Class A)
• ICES-003 (2004)
• GR-1089-CORE Issue 4, NEBS EMC and Safety (June 2006)
15454-SA-HD or 15454-SA-HD-DDR shelf assembly with CC-FTA or FTA3 version fan-tray assembly
15454-SA-ETSI shelf assembly with CC-FTA or SDH 48V fan-tray assembly
System software
Release 9.1.0 ANSI or later
Release 9.1.0 ETSI or later
Table 6. Tunable Dispersion Compensation Unit Specifications
Specification
Coarse Unit (15454-TDC-FC=)
Fine Unit (15454-TDC-FC=)
Management
Card LEDs
• Failure (FAIL)
• Active/standby (ACT/STBY)
• Signal fail (SF)
Red
Green/yellow
Yellow
Red
Green/yellow
Yellow
Operating Environment
Temperature
• Normal
• Short term1
0ºC to 40°C (32°F to 104°F)
-5ºC to 55ºC (23ºF to 131ºF)
0ºC to 40°C (32°F to 104°F)
-5ºC to 55ºC (23ºF to 131ºF)
Relative humidity
• Normal
• Short term
5% to 85%, non-condensing
5% to 90% RH but not to exceed 0.024 kg water/kg of dry air
5% to 85%, non-condensing
5% to 90% RH but not to exceed 0.024 kg water/kg of dry air
Storage Environment
Temperature
-40°C to 70°C (-40°F to 158°F)
-40°C to 70°C (-40°F to 158°F)
Relative humidity
5% to 95% RH
5 to 95% RH
Connectors
Connectors type
LC (All the ports)
LC (All the ports)
Power
Card power draw
• Typical
• Maximum
9W
11W
9W
11W
Physical
Size
1 slot
1 slot
Supported shelf slots
1-6, 12-17
1-6, 12-17
1. Short-term refers to a period of not more than 96 consecutive hours and a total of not more than 15 days in 1 year. This refers to a total of 360 hours in any given year, but no more than 15 occurrences during that 1-year period.
To place an order, visit the Cisco Ordering Home Page. To download software, visit the Cisco Software Center. Table 7 provides ordering information for the Cisco ONS 15454 Tunable Dispersion Compensation Unit.
Table 7. Ordering Information
Product Name
Part Number
Tunable Dispersion Compensation Unit - C- Band - Fine
15454-TDC-FC=
Tunable Dispersion Compensation Unit - C- Band - Coarse
15454-TDC-CC=
Cisco Services
Cisco Services make networks, applications, and the people who use them work better together.
Today, the network is a strategic platform in a world that demands better integration between people, information, and ideas. The network works better when services, together with products, create solutions aligned with business needs and opportunities.
The unique Cisco Lifecycle approach to services defines the requisite activities at each phase of the network lifecycle to help ensure service excellence. With a collaborative delivery methodology that joins the forces of Cisco, our skilled network of partners, and our customers, we achieve the best results.
