Optoelectronics Prisma II Optical s Description The Prisma II optical network is an advanced transmission system designed to optimize network architectures and increase reliability, scalability, and cost effectiveness. Each Prisma II 1310/1550 Optical is optimized for superior performance. Up to 13 receiver modules can be placed in a single Prisma II chassis. Each and module contains two independent optical receivers. The module contains a single forward optical receiver. Features Blind-mate (push-on) connections for RF, power, and data RF test points (one for each receiver) Multiple set-up and control options - Local control via Local Craft Interface (LCI) - Local control via Intelligent Communications Interface Module (ICIM) - Remote monitoring via Transmission Networks Control System (TNCS) Master / Slave Redundancy
Prisma II Optical s Block Diagrams and Video s 2
Prisma II Optical s Specifications Optical Input Power dbm -4 to +5-17 to +2-17 to +2 Wavelength nm 1310 ± 20 1310 ± 20 1310 ± 20 1550 ± 20 1550 ± 20 1550 ± 20 Optical Return Loss db < -40 db < -30 db < -30 db Optical Interface SC/APC SC/UPC, FC/UPC, E2000 Standard Optional Standard Optional Standard Optional Notes Electrical Notes RF Bandwidth MHz 50 to 870 5 to 65 5 to 200 RF Output Level dbmv Use RF output level Use RF output level Use RF output level 1,2 versus OMI graph (below) calculations (next page) calculations (next page) Maximum RF Output Level dbmv 35/ch. for 110 ch. 61 (composite) 61 (composite) 3 36.5/ch. for 78 ch. Module Responsivity A/W db 14 22.9 150 43.5 82 38.3 RF Frequency Response db ± 1.0 db ± 0.5 db ± 0.5 db RF Test Point db -20 (± 0.5) -20 (± 1.0) -20 (± 1.0) Return Loss db 16 @ 50-550 MHz > 16 > 16 4 Tilt db 0 to +1 + 0.5 to 0.5 +0.75 to 1.25 Noise Equivalent Power pa Hz < 7.5 < 8; nominal 6 < 8; nominal 6 Power Consumption W DC < 15 < 13 < 13 RF Output Level Vs Transmitter Optical Modulation Index (OMI) Minimum RF Output Level per ch (dbmv) 1, 2 with +3 dbm Optical Input Power 36.0 35.0 34.0 33.0 32.0 31.0 2.50% 2.75% 3.00% 3.25% 3.50% 3.75% 1310 nm 1550 nm 4.00% Transmitter OMI per Channel Minimum RF Output Level per ch (dbmv) 1, 2 with +3 dbm Optical Input Power 43.0 42.0 41.0 40.0 39.0 38.0 37.0 5.00% 5.50% 6.00% 6.50% 7.00% 7.50% 8.00% Transmitter OMI per Channel 1310 nm 1550 nm Notes: 1. Graph shows minimum forward receiver (RX) RF output level for the stated transmitter percent Optical Modulation Index (OMI) per channel, with receiver optical input power of +3 dbm and receiver RF attenuator set to 0 db. To determine RF output levels at other optical input power, add (or subtract) 2 db in RF level for each 1 db increase (or decrease) in receiver optical input power. 2. At minimum RF attenuation setting. RXs are equipped with a 6 db variable RF attenuator. RX attenuation controlled via RX front panel potentiometer. The potentiometer can be accessed by unscrewing the protective plug located directly above the RF test point. Increase attenuation by turning clockwise. [Caution: to prevent damage to unit, avoid inserting screwdriver beyond potentiometer]. Reverse RXs are equipped with a 20 db variable RF attenuator. Reverse RX attenuation controlled via optional Intelligent Control Interface Module (ICIM) front panel keypad. 3. Reverse RX maximum output level determined using 5 to 42 MHz noise loading, while ensuring that the Noise Power Ratio (NPR) dynamic range for the link is not limited by the RX. RX RF attenuation may be needed to prevent the maximum RX output level from being exceeded during operation (see Reverse RF Output Level Calculations on next page). 4. For forward RX only, the return loss above 550 MHz is reduced from the 16 db specification by 3 X F, where F is the frequency in GHz. For example, at 800 MHz the return loss is 16 (3 X 0.8) which equals 13.6 db. 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. 3
Prisma II Optical s Specifications - Cont d Reverse RF Output Level Calculations To determine receiver (Rx) RF output level for design purposes: 1. Calculate full link gain (formula below). 2. Calculate useable link gain : a. Add the full link gain to the reverse transmitter s maximum expected composite RF input (drive) level to determine the maximum expected RX composite RF output level. b. Determine if the maximum expected reverse RX composite RF output level exceeds the maximum RF output level specification (previous page). If the maximum is exceeded, calculate the amount of RX RF attenuation (level reduction in db) required to prevent such occurrence. Then calculate the useable link gain (formula below). If the maximum is not exceeded, the full link gain is equal to the useable link gain (no RX attenuation required). 3. Calculate RF output level (formula below). Note: Many systems design for a common RX RF output level, which is calculated first for the link(s) with the greatest optical loss. For links with lower optical loss, RX RF attenuation is then added (2 db for each db lower optical link loss) in order to achieve the common RX RF output level. Formula for: used: Full Link Gain 1 (db) RX 77 m peak + (2 x P in ) RX 72 m peak + (2 x P in ) Useable Link Gain (db) Full link gain RX attenuation RX RF output level 2 (dbmv) TX design RF input level + Useable link gain Notes 1. In the full link gain formula; m peak is the reverse transmitter s single CW carrier RF input (drive) level, expressed in dbmv, that produces 100% peak OMI, and P in is the reverse receiver s optical input power, expressed in dbm. Resultant full link gain is the (db) gain of the link from reverse transmitter RF input to reverse receiver RF output, with receiver output attenuation set to minimum (0 db) setting. 2. This formula yields the RF output level that can be used for reverse RF design in the headend or hub site where the receiver is located. 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. 4
Prisma II Optical s Specifications - Cont d Environmental Notes Temperature Range Full Specs and Operational C F -40 to +65-40 to +149-40 to +65-40 to +149-40 to +65-40 to +149 Humidity Range % 0 to 95 0 to 95 0 to 95 1 Mechanical Physical Dimensions Depth in. 9.8 9.8 9.8 cm 24.9 24.9 24.9 Width in. 1.03 1.03 1.03 cm 2.6 2.6 2.6 Height in. 7.6 7.6 7.6 cm 19.3 19.3 19.3 Weight lbs. 2.2 3.0 3.0 kg 1.0 1.4 1.4 Module Width slots 1 1 1 Notes Notes: 1. Recommended for use only in non-condensing environments. 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. 5
Prisma II Optical s Ordering Information Sample P 2 R X R D S A P 2 Platform Product (5-65 MHz) (5-200 MHz) RXF RXRD RXRV Connectors SC/APC* SC/UPC FC/UPC E2000/APC SA SP FP E2 * Standard connector Prisma II products include the industry s most complete range of high performance optical components: For more information please refer to: Platform Prisma II Data Sheet Part Number 739199 1310 nm Transmitters Prisma II Data Sheet Part Number 739200 1550 nm Transmitters Prisma II Data Sheet Part Number 739201 1550 nm Optical Amplifiers Prisma II Data Sheet Part Number 739202 Ancillary Modules Prisma II Data Sheet Part Number 739205 bdr Digital Reverse 2:1 Multiplexing System Prisma II Data Sheet Part Number 744484 Scientific-Atlanta, the Scientific-Atlanta logo, and Prisma are registered trademarks of Scientific-Atlanta, Inc. Prisma II and bdr are trademarks of Scientific-Atlanta, Inc. Specifications and product availability are subject to change without notice. 2002 Scientific-Atlanta, Inc. All rights reserved. Scientific-Atlanta, Inc. 1-800-722-2009 or 770-236-6900 www.scientificatlanta.com Part Number 739203 Rev C November 2002 6