Cisco Prisma II Hybrid QAM Transmitters Data Sheet
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Cisco’s Prisma® II optical networks support DOCSIS 3.1 features in growing fiber deep and remote PHY architectures. The Cisco Prisma II Hybrid QAM Transmitter (HQT) offers superior MER complete with 4k QAM and Orthogonal Frequency Division Multiplexing (OFDM) capabilities.
Designed to support the move to higher order modulation for capacity increases, the HQT also enhances legacy systems with analog capability combining the superior performance of externally modulated systems with the cost-effective and ease-of-use of familiar directly modulated transmitters. Low sensitivity to link-length variations make the HQT ideal for redundant rings. Adjustable dither control for varying Brillouin Scattering suppression (SBS) and iWDM wavelength plans ensure excellent performance when fiber non-linearities are unavoidable.
The first truly universal transmitter in the broadband marketplace, the HQT provides unprecedented value in the highly competitive service provider space. Flexibility to support traditional legacy and best-in-class architectures, the HQT is a transmitter that delivers performance with increased reliability, scalability, and cost-effectiveness.
Features
● Highest MER transmitter available in broadband markets
● Link performance no longer transmitter limited
● Selectable dither controls for few wavelength, high gain systems
● Increased Power over DFB-based transmitters
● Low link-length sensitivity for Ring topologies
● Fully DOCSIS 3.1 compatible
● OFDM, 1k, 2k, 4k QAM support (high order modulation)
● 1218 MHz RF bandwidth for increased channel capacity
● High immunity to impairments
◦ 20-30 dB less Chirp and Dispersion induced distortion
◦ 75% reduction in fiber noise generation
◦ Low sensitivity to fiber length variations for redundant rings
◦ 75% less fiber noise generation compared to DFB improves SNR
◦ Lower distortion from EXISTING Mux-Demux slope variation
● Operates within the Prisma II or Prisma XD platform systems
● ITU-T wavelength compatible for DWDM systems
● Small CO2 footprint: lowest power consumption per transmitter in the industry
● Status LEDs indicate module condition and simplify troubleshooting
● Blind-mate (push-on) RF and DC connectors
● RF input test points
● Nonvolatile storage of pre-set operating parameters simplifies installation procedures
● User selectable Automatic Gain Control (AGC)
● Local control via Local Craft Interface (LCI) or Intelligent Communications Interface Module (ICIM)
● SNMP remote monitoring
Product Specifications
Unless otherwise noted, specifications are based on measurements made in accordance with NCTA Practices for Measurements made on Cable Television Systems using standard frequency assignments, and are referenced to the ambient air temperature at the inlet to the Prisma II or Prisma XD chassis.
Table 1. Cisco Prisma II Hybrid QAM Transmitter product specifications
| Optical | |
| Wavelength | ITU channels 21, 22, 24, 26, 28, 33, 36, 39 44, 48, 52, 54, 57, 60, 61, 62 |
| Output Power | 11-12 dBm |
| Modulation Type | Hybrid Externally Modulated Laser |
| Dither setting | User settable: off (12 dBm SBS) or on (16 dBm SBS) |
| RF | |
| Operating Bandwidth | 54 MHz to 1218 MHz |
| Nominal Channel Loading | 30 Channels, NTSC CW Analog [54-258 MHz] 96 Channels, J.83 ITU Annex B, 256 QAM (6 MHz) [258-834 MHz] 2 Channels, 192 MHz OFDM [834-1218 MHz] |
| RF Input for Nominal Channel Loading ● Broadcast port, Analog channels ● Broadcast port, QAM channels ● Broadcast port, OFDM signal ● Narrowcast port, QAM channels ● Narrowcast port OFDM signal |
18 dBmV/ch 12 dBmV/ch 27 dBmV total power (matches QAM level—see note below) 12 dBmV/ch) 27 dBmV total power (matches QAM level—see note below) |
| Total Composite RF Input | 36.5 dBmV (nominal channel loading) |
| RF Input Return Loss | 16 dB |
| Digital Link Performance @ 60 km fiber ● 194 QAM channels or ● 130 QAM channels plus 384 MHz OFDM |
MER: ≥ 44 dB BER: < 1.0 x 10-9 Pre-FEC < 1.0 x 10-12 Post-FEC |
| Mixed Link Performance @ 40 km fiber ● 30 analog channels and ● 96 QAM channels and ● 2 OFDM channels (384 MHz) | CNR: 50.0 dB CSO, CTB: - 62 dBc
MER: ≥ 38 dB BER: < 1.0 x 10-9 Pre-FEC < 1.0 x 10-12 Post-FEC |
| Electrical/Mechanical/Environmental | |
| Power Consumption | 7.5 W |
| Connector Type | SC/APC |
| Management & Control | Web Interface SNMP |
| Dimensions | Height: 3.48 in, 8.84 mm Width: 1.03 in, 2.62 mm Depth: 8.80 in, 22.35 mm |
| Weight | < 0.90 lbs., < 0.41 kg |
| Operational Temperature | 0 to 50 degrees Celsius |
| Humidity | 5 to 95% Non-Condensing |
NOTES
1. Available ITU channels constitute the iWDM plan. See table 2 for the part numbers associated with the particular wavelengths.
2. With nominal channel loading at levels and total composite power indicated, the GUI or CLI parameter table will read 0 dB in.
3. Level shown for OFDM represents the total power of a 192 MHz wide OFDM signal. This is equivalent to the power per 6 MHz CEA (Consumer Electronics Association) channel + 10*log10 (Number of occupied CEA channels); that is [12dBmV + 10*log10(32)] = 27 dBmV.
4. Specifications are based on a single transmitter.
5. The test link setup is shown in figure 2. The receiver has an efficiency of 0.95 A/W and a noise equivalent power of 3.9 pA/√Hz.
6. Test loading may substitute SC-QAM for OFDM signals.
7. Received power is -1.5 dBm for all digital load and -2 dBm for mixed analog plus digital load.
8. Dither setting will impact the SBS level, and should be on only if per wavelength power exceeds ~12 dBm. The MER can degrade up to 4 dB with high SBS levels.
9. Transmitter MER is based on system MER >57 dB with SBS level of 12 dBm.
Ordering Information
Part numbers for the Cisco Prisma II Hybrid QAM 1.2 transmitters are shown in Table 2. Please consult with your Cisco account representative, customer service representative, or system engineer to determine the best configuration for your particular application.
Table 2. Cisco Prisma II Hybrid QAM 1.2 transmitter part numbers
| Description | Cisco Part Number |
| 1.2 GHZ HYBRID QAM TRANSMITTER, ITU21 iWDM | P2HD1.2G15TXQP21i= |
| 1.2 GHZ HYBRID QAM TRANSMITTER, ITU22 iWDM | P2HD1.2G15TXQP22i= |
| 1.2 GHZ HYBRID QAM TRANSMITTER, ITU24 iWDM | P2HD1.2G15TXQP24i= |
| 1.2 GHZ HYBRID QAM TRANSMITTER, ITU26 iWDM | P2HD1.2G15TXQP26i= |
| 1.2 GHZ HYBRID QAM TRANSMITTER, ITU28 iWDM | P2HD1.2G15TXQP28i= |
| 1.2 GHZ HYBRID QAM TRANSMITTER, ITU33 iWDM | P2HD1.2G15TXQP33i= |
| 1.2 GHZ HYBRID QAM TRANSMITTER, ITU36 iWDM | P2HD1.2G15TXQP36i= |
| 1.2 GHZ HYBRID QAM TRANSMITTER, ITU39 iWDM | P2HD1.2G15TXQP39i= |
| 1.2 GHZ HYBRID QAM TRANSMITTER, ITU44 iWDM | P2HD1.2G15TXQP44i= |
| 1.2 GHZ HYBRID QAM TRANSMITTER, ITU48 iWDM | P2HD1.2G15TXQP48i= |
| 1.2 GHZ HYBRID QAM TRANSMITTER, ITU52 iWDM | P2HD1.2G15TXQP52i= |
| 1.2 GHZ HYBRID QAM TRANSMITTER, ITU54 iWDM | P2HD1.2G15TXQP54i= |
| 1.2 GHZ HYBRID QAM TRANSMITTER, ITU57 iWDM | P2HD1.2G15TXQP57i= |
| 1.2 GHZ HYBRID QAM TRANSMITTER, ITU60 iWDM | P2HD1.2G15TXQP60i= |
| 1.2 GHZ HYBRID QAM TRANSMITTER, ITU61 iWDM | P2HD1.2G15TXQP61i= |
| 1.2 GHZ HYBRID QAM TRANSMITTER, ITU62 iWDM | P2HD1.2G15TXQP62i= |
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