Data Sheet

Page 5 of 8
Table 5. Link Performance Specs - Long Reach Externally-Modulated Broadcast Transmitters (see note 8)
Channel Loading CNR* CSO* CTB* Notes
40 NTSC analog ch’s (Low or High) 55 65 65 1,3
78 NTSC analog ch’s with:
-200 MHz QAM (550-750 MHz) @ -6 dB
64 PAL B/G analog ch’s with:
-150 MHz QAM (600-750 MHz) @ -6 dB
59 PAL D/K analog ch’s with:
-150 MHz QAM (600-750 MHz) @ -6 dB
51.5 65 65 1,2,3
*For Links using PII 1 GHz Long Reach Externally-Modulated Broadcast Tx followed by EDFA and launched into 65 km SM fiber, with 0 dBm
optical input to the receiver.
4,6,7,11
Table 6. Link Performance Specs - Extended Reach Externally-Modulated Broadcast Transmitters (see notes 9 & 10)
Channel Loading CNR** CSO** CTB** Notes
40 NTSC analog ch’s (Low or High) 55 65 65 1,3
78 NTSC analog ch’s with:
-200 MHz QAM (550-750 MHz) @ -6 dB
64 PAL B/G analog ch’s with:
-150 MHz QAM (600-750 MHz) @ -6 dB
59 PAL D/K analog ch’s with:
-150 MHz QAM (600-750 MHz) @ -6 dB
51.5 65 65 1,2,3
**For Links using PII 1 GHz Extended Reach Externally-Modulated Broadcast Tx followed by EDFA launched into 40 km SM fiber, into a 2
nd
EDFA followed by 30 km SM fiber, with +1 dBm optical input to the receiver.
4,11
Table 7. Link Performance Specs - High-Density Forward QAM Directly-Modulated Broadcast Transmitters
Channel Loading MER
++
BER CNR
+
Notes
16 QAM256 or QAM64 ch’s 38 ≤ 1 e-9 50 1,3,5,12
+
For Links using PII 1 GHz Forward QAM 10 dBm Tx or PII 1 GHz High Density Forward QAM 10 dBm Tx, launched into 60 km SM fiber with
-8 dBm optical input to the receiver.
11
++
Test equipment may limit measured performance.
Table 8. Link Performance Specs - Reverse Directly-Modulated Transmitters
NPR (db) RF Input Dynamic Range (dB) Notes
42 14 13
Notes:
1. With specified RF input levels and optical link conditions.
2. For 78 NTSC, 64 PAL B/G or 59 PAL D/K with full QAM loading through 1002 MHz, subtract 1 dB from listed CNR.
3. Receiver with NEP = 7 pa / √Hz; ρ = 0.9 A/W.
4. EDFA minimum input power is 5.0 dBm; noise figure is 5.5 dB.
5. BER is before Forward Error Correction (pre-FEC), with ITU-B J.83 Annex B QAM modulation.
6. Primary (J1) output. Secondary (J2).
7. Second port (J2) may have some performance degradation as compared with J1. J2 is available for back-up or route-redundant systems.
8. The Long Reach Tx is used to service point to point, or point to multipoint architectures with links up to 65 km.
9. The Extended Reach Tx is used to service point to point, or point to multipoint architectures with link distances between 65 km to 80 km.
10. For applications with links greater than 80 km using the Extended Reach Tx, Dispersion Compensation Modules will improve composite
distortion values. CNR will continue to degrade as distance increases.
11. Typical operating parameters. For other performance levels, please contact Applications Engineering.
12. CNR with 16 CW channels.
13. NPR performance and associated dynamic range with 40km of fiber and 35 MHz noise loading.
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 chassis.