Table of Contents
Release Notes for Cisco DVB INA2320 Interactive Network Adapter for Release 2.1A
New and Changed Information
Obtaining Technical Assistance
April 26, 2000
These release notes for the Cisco DVB INA2320 Interactive Network Adapter support INA2320 Software Release 2.1A. These release notes are updated as needed to describe new features, memory requirements, hardware support, and changes to the microcode, configuration software, and related documents.
For a list of caveats that apply to Release 2.1A, see the "Open CaveatsRelease 2.1A" section.
These release notes discuss the following topics:
- System Requirements
- New and Changed Information
- Documentation Update
- Related Documentation
- Obtaining Documentation
- Obtaining Technical Assistance
The Cisco DVB INA2320 Interactive Network Adapter is the headend unit controlling the bidirectional broadband data communication over the hybrid fibre coaxial (HFC) network to the customer premises equipment (CPE) that is connected to the HFC network. The Cisco DVB INA2320 is based on the open Digital Video Broadcast (DVB) standards.
The Cisco DVB INA2320 interfaces to DVB-compliant CPE and provides the link to the backbone network toward the Internet Protocol (IP) hosts using an Ethernet interface.
You can configure and monitor the Cisco DVB INA2320 using the Cable DVB/DAVIC Management Program; this program is based on Simple Network Management Protocol (SNMP) standard.
The hardware components supported in this release include:
- INA2320 Chassis
- CPU-LAN module
- Modulator module (1 downstream channel)
- Demodulator module 1 and 2 (4 upstream channels per module)
- Power Supply Unit
- Upconverter module 1 and 2
- Power connector
Unless properly installed, the INA2320 demodulators are sensitive to RF signals induced on the cables at the upstream frequencies.
To ensure the immunity of the INA2320 Demodulator module all cables connected to the INA must be of a high quality with double screening or solid outer conductor. RG216 cables or bamboo cables are recommended.
Signal couplers should be located as close to the INA2320 as possible, preferably in the same rack section, and connected to the INA2320 by the shortest possible sections of cable.
The CPU-LAN, the Modulator and Demodulator modules are equipped with contact springs at the front panels. When replacing the modules, it is important that the springs remain undamaged. Even small openings in the front panel make the INA2320 sensitive to Electrostatic Discharge.
The Cisco DVB INA2320 must be mounted with an air separation plate beneath it to meet the safety requirements. It is mandatory that the front edge of the air separation plate is equipped with a device collecting particles coming from the INA2320 mounted above the air separation plate.
For further instructions how to mount forced cooling devices and how to ventilate the Cisco DVB INA2320 correctly see the Cisco DVB INA2320 Installation and Configuration Guide.
To meet the temperature requirements the INA2320 must be mounted with a fan tray above it to ensure forced cooling of the unit.
|Note Make sure the fan tray secures air flow on all modules in the INA2320, that is across the full width of the Cisco DVB INA2320.|
The downstream FTP performance of the INA2320 in release 2.1A has been measured to approximately 16 Mbit/second (payload data). In the future release the performance is expected to be closer to the target of approximately 30 Mbps per downstream channel.
The upstream FTP performance of the INA2320 in release 2.1A has been measured to approximately 1.25 Mbit/second per upstream (payload data). In the future release the performance is expected to be closer to the target of 1.75 Mbps per upstream channel.
- Spectral inversion has no effect in the release 2.1A.
- Some MIB-II variables cannot be set from SNMP. These MIB variables are defined as write variables in the MIB file, but they cannot be changed:
- The software path should not contain special characters. If these characters are used the INA2320 will ignore the set and keep the previous value.
- When the INA is set to the default settings, the FLASH image is removed.
- Work-around: Boot the INA2320 from an FTP server as described in the Installation and Configuration Guide.
The following additions have been made to the management program. They are not described in the document "Cisco DVB Interactive Network Adapter INA2320 Installation and Configuration Guide".
Round Trip Delay
Use this field to add an additional round trip delay for long distance networks. The default value is 0. Active after INA Reboot.
DHCP Server Address
This field is used as a DHCP helper address, that allows the DHCP server to be placed in a subnet different than the subnet on the Ethernet side of the INA2320. The default value is 0.0.0.0, which indicates that no DHCP helper address is used.
DHCP Backup Server Address
This field is used when there is a backup DHCP server in the network. The default value is 0.0.0.0, that indicates that no DHCP Backup server is used.
|Note This field is only used if the DHCP Server Address is different from 0.0.0.0.|
These documents are available for the Cisco DVB INA2320 Interactive Network Adapter on CCO:
- Cisco DVB INA2320 Installation and Configuration Guide
Cisco documentation and additional literature are available in a CD-ROM package, which ships with your product. The Documentation CD-ROM is updated monthly. Therefore, it is probably more current than printed documentation. The CD-ROM package is available as a single unit or as an annual subscription.
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This document is to be used in conjunction with the documents listed in the "Related Documentation" section.
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