Prisma .... Optical Networks Ancillary Modules

17 Pages·2001·3.89 MB·English

Optoelectronics

Prisma Optical Networks
Ancillary Modules

Description

The Prisma platform is capable of utilizing a combination of modules which
address a variety of revenue generating applications. The platform also
supports important reliability enhancing features such as redundant power
supplies, Status Monitoring and Control (with CIM) and network switching.

The Prisma Family of Ancillary Modules Includes:
Headend Driver Amplifiers
Designed to operate within the Prisma platform, the Model 6472 Headend
Driver Amplifier is engineered to provide exceptional RF signal boost to
meet the requirements of the Prisma optical transmitters.
(Pages 2 through 5)

Reverse Headend Amplifiers Driver Amplifier
The Model 6472-R Reverse Headend Driver Amplifier provides reverse path
RF amplification to support network efficiency.

(Pages 6 through 9)

Optical Switches
Avaialable in either 1310 nm or 1550 nm configurations, the Model 6474
Optical Switch works in the Prisma platform to provide optical backup and
line redundancy for both short and long reach applications.
(Pages 10 through 13)

1 GHz RF Switch
Similar to the Model 6474 Optical Switches, the Model 6974 RF Switch
provides the same switching security of RF signals for increased network
efficiency.
(Pages 14 through 17)

Optical Switch

RF Switch
Prisma Optical Networks - Ancillary Modules
Model 6472 46 – 870 MHz
Headend Driver Amplifier

Description
The Model 6472 Headend Driver Amplifier is an indoor RF amplifier for
use in the headend or hub network and is a valuable addition to the

Prisma family of products. Its purpose is to amplify or "boost" the RF
signal level to meet the input requirements of the Prisma optical
transmitters.

The Model 6472 utilizes a PHD hybrid and features an easily
accessible, variable attenuator and equalizer to provide optimum signal
level and a flat input to the transmitter.

Configured in conjunction with a Model 6477 Interface Module, two
Model 6472 modules can be housed in a single width unit of the Prisma
Chassis. The Model 6472 is externally powered by the Prisma power
supply which reduces heat and extends the life of the hybrid.

Features
• Designed to operate within the Prisma platform
• Compact size saves headend space (up to 18 modules/chassis)
• 46-870 MHz pass band

• Front side serviceable for ease of setup and maintenance
− Status LEDs indicate module condition and simplify troubleshooting
Forward Driver Amplifier
− Variable attenuator and equalizer
− Blind-mate (push-on) RF and DC connectors
− RF input test point (-20 dB)
• Internal current sensing circuitry monitors the operation of the hybrid

2
Prisma Optical Networks – Ancillary Modules

Model 6472 46 – 870 MHz Headend Driver Amplifier

Block Diagram

3
Prisma Optical Networks – Ancillary Modules

Model 6472 46 – 870 MHz Headend Driver Amplifier

Specifications
RF Units Notes
RF Bandwidth MHz 46 – 870
Frequency Response (deviation from flat response) dB ± 0.55
Return Loss (minimum) dB 17 @ 46 – 750 MHz 3
Input Typical 16 @ 750 – 860 MHz
15 @ 860 – 870 MHz
Return Loss (minimum) dB 14.5 @ 46 – 600 MHz 4
Output Typical 14 @ 600 – 860 MHz
13 @ 860 – 870 MHz
Noise Figure (maximum) dB 10.5 @ 50 MHz 3
12.5 @ 750 MHz
13.5 @ 870 MHz
Module Gain (minimum) dB 13.5
(typical) 14.0
Variable Attenuator 0 – 3 dB in 1 dB steps
Variable Equalizer 0 – 7.5 dB in 1.5 dB steps
Distortions TYPICAL MINIMUM 1
Composite Triple Beat 83.5 82.0
Composite Second Order 75.0 73.0
Cross Modulation 89.0 86.0
RF Test Points dB -20.0 ± 1.0 dB

Electrical Units Notes
Operating Temperature Range °C 0 to 50 5
°F +32 to +122
Power Supply (nominal) V DC 24
Power Consumption W DC 17.0 maximum

Mechanical Units Notes
Physical Dimensions 2
Depth in. 12.0
cm 30.5
Width in. 1.6 2
cm 4.1
Height in. 6.4 2
cm 16.3
Weight lbs 3.0 2
kg 1.4

Notes:

1. Distortions measured with 110 unmodulated (CW) NTSC analog channels at 30 dBmV flat output (46-870 MHz).

Distortions may degrade 0.5 dB at high temperature.

2. With Model 6477 Interface Module and two Model 6472 HEDAs.
3. With attenuator and equalizer set to 0.0 dB.
4. Return loss can degrade by 1 dB at high temperature.
5. Recommended for use only in non-condensing environments.

Unless other wise notes, specifications are based on measurements made in accordance with NCTA Practices for Measurements on Cable
Television Systems using standard frequency assignments and are referenced to 30°C (86°F) at the inlet to the Chassis cooling fans.

4
Prisma Optical Networks – Ancillary Modules

Model 6472 46 – 870 MHz Headend Driver Amplifier

Ordering Information

Model Part Number
6472 Headend Driver Amplifier 562363
Required Accessories Part Number
6477 Interface Module1 562355

Related Equipment Part Number
Model 6470-R2 Prisma Chassis 562255
Prisma Blank Panel 545799
Prisma Model 6472-R Reverse Headend Driver Amplifier 570096

Note:
1. One required per two Model 6472 modules (assumes Prisma Chassis is already present).

For other Prisma Modules refer to the Prisma Platform Data Sheet.
5
Prisma Optical Networks – Ancillary Modules
Model 6472-R 5 – 200 MHz
Reverse Headend Driver Amplifier

Description

The Prisma platform is capable of utilizing a combination of modules
which address a variety of revenue generating applications. The
platform also supports important reliability enhancing features such as
redundant power supplies, Status Monitoring and Control (with CIM)
and network switching.

The Model 6472-R Reverse Headend Driver Amplifier is designed to
add to this flexibility. The Model 6472-R provides amplification in the
reverse path RF bandwidth and is typically an integral part of the
reverse combining network.

Ease of installation, setup, and maintenance are inherent with the
Model 6472-R and are of great benefit in both complex and basic 2-way
systems.

When used with other Prisma modules, such as the Model 6971-DR
Dual Reverse Receiver, the Model 6472-R can provide advanced RF
signal level control for deployment of advanced reverse path services.

Features
• Designed to operate within the Prisma platform Reverse Driver Amplifier
• Compact size saves headend space
• 5 - 200 MHz pass band
• Front side serviceable for ease of setup and maintenance
− Status LEDs indicate module condition and simplify troubleshooting
− Variable attenuator and equalizer
− Blind-mate (push-on) RF and DC connectors
− RF input test point (-20 dB)
• Internal current sensing circuitry monitors the operation of the hybrid

6
Prisma Optical Networks – Ancillary Modules

Model 6472-R 5 – 200 MHz Reverse Headend Driver Amplifier

Block Diagram

7
Prisma Optical Networks – Ancillary Modules

Model 6472-R 5 – 200 MHz Reverse Headend Driver Amplifier

Specifications
RF Units Notes
RF Bandwidth MHz 5 – 200
Frequency Response (deviation from flat response) dB ± 0.5
Return Loss dB 18 @ 5 - 80 MHz
16.5 @ 8- - 200
Noise Figure dB 9 4
Module Gain (minimum) dB 20.5 @ 80 MHz
(typical) 21.0 @ 80 MHz
Variable Attenuator 0 – 3 dB in 1 dB steps
Variable Equalizer 0.5 – 5.5 dB in 1 dB steps
Distortions (typical) dB 1
Composite Triple Beat 75
Composite Second Order 72
RF Input Test Point dB -20.0 ± 1.0 dB

Electrical Units Notes
Operating Temperature Range °C 0 to 50 3
°F +32 to +122
Power Supply (nominal) V DC 24
Power Consumption W DC 8.1 maximum

Mechanical Units Notes
Physical Dimensions 2
Depth in. 12.0
cm 30.5
Width in. 1.6 2
cm 4.1
Height in. 6.4 2
cm 16.3
Weight lbs 5.0 2
kg 2.3

Notes:

1. Distortions measured at 20°C with 28 dBmV / channel output level for 22 unmodulated (CW) NTSC channels between

7 MHz and 175 MHz.

2. With Model 6477 interface module and two Model 6472-R HEDAs.

3. Recommended for use only in non-condensing environments.
4. With attenuator and equalizer set to 0 dB.

Unless otherwise noted, specifications are based on measurements made in accordance with NCTA Practices for Measurements on Cable
Television Systems using standard frequency assignments and are referenced to 30°C (86°F) at the inlet to the Chassis cooling fans.
8
Prisma Optical Networks – Ancillary Modules

Model 6472-R 5 – 200 MHz Headend Driver Amplifier

Ordering Information

Model Part Number
6472-R Reverse Headend Driver Amplifier 570096
Required Accessories Part Number
6477 Interface Module1 562355

Related Equipment Part Number
Model 6470-R2 Prisma Chassis 562255
Prisma Blank Panel 545799
Prisma Model 6971-DR Dual Reverse Receiver 544964

Note:

1. One required per two Model 6472 modules (assumes Prisma Chassis is already present).

For other Prisma Modules refer to the Prisma Platform Data Sheet.
9
Prisma Optical Networks – Ancillary Modules
Model 6474 1310 nm and 1550 nm
Optical Switches

Description

The Prisma platform is capable of using a combination of
modules which address a variety of revenue-generating
applications. The platform also supports important reliability
enhancing features such as redundant power supplies, Status
Monitoring and Control (with CIM), and network switching.

The Model 6474 1550 and 1310 nm Optical Switches add to the
reliability of the Prisma platform by providing optical backup and
redundancy.

The 1550 nm wavelength is typically used in high power / long-
haul systems which employ externally modulated transmitters and
in-line optical amplifiers. The 1550 nm optical switch provides
backup for both these devices. The 1310 nm wavelength is
typically used in HFC type networks with relatively short optical
spans. The 1310 nm optical switch provides for transmitter,
receiver, and/or optical path redundancy. Both the 1310 and
1550 nm optical switches can be switched by any one of four
methods: loss of light, front panel (manual) operation, status
monitoring and control, or external alarm input.

Another important feature is switch hysteresis. These two user
definable values prevent the switch from going back to the
primary input until it is completely stable.
Optical Switch

Features
• Designed to operate within the Prisma platform (single-width module)
• Provides redundancy for long or short haul links
• Loss of optical power detection
• Large optical power dynamic range (-13 to +18 dBm)
• Front side serviceable for ease of setup and maintenance
− Advanced LCD display
− Status LEDs indicate module condition and simplify troubleshooting
− Blind-mate (push-on) RF and DC connectors
• Time out setting (set by user) that prevents false reactivation of the switch before a reliable signal has been
restored
• Input power threshold (set by user) to determine when a switch occurs
• Both automatic and manual switch modes
• Status Monitoring and Control capable
• Can be connected to an external alarm system

10