2
–
Functional Design
NetXpress LX & CM-30R Installation & Operation Manual
Version 1.1
GatesAir, Inc.
2-19
Intraplex Products
2.10.1 RBS
T1 systems use the RBS method of channel signaling. This information is embedded into the least
significant bit of the audio channel once every 6th frame and injected into the channel without regard
to the remaining bits. Therefore, RBS does distort the voice audio signal so slightly that you can only
perceive it by distortion measurements. RBS signaling support should not be used on channels
carrying information other than voice audio as it corrupts the data in the channel.
2.10.2 CAS
E1 systems use CAS to carry voice call information. Instead of embedding this information in the same
channel as the voice audio, channel 16 of the E1 is reserved for all remaining channels to use for
transporting signaling information.
2.11 Software Download
During normal operation, the CM-30R module loads the primary image. Should it fail to boot the
primary image, the module then attempts to load the secondary image.
In the case of a failure in loading both the primary and secondary image, you can configure the CM-
30R module to load an image from a remote FTP server. This image is not saved to either of the flash
memory devices. You can also configure the module to load the secondary image first, but if that fails,
the module moves directly to loading from the remote FTP server and does not try to load the primary
image.
When shipped from the factory, the CM-30R IP interface module contains the most recent version of
the system software. As new features and improvements become available, the CM-30R module
software should be updated to the most current revision.
The CM-30R software can be upgraded by opening an FTP session with the module and transferring a
new image file to the flash memory device. You can configure both the primary and secondary images
to be loaded from the same file or from two different file images. In addition, you can store multiple
software images on the CM-30R module 1 up to the limit of the flash memory. To obtain the software
and boot ROM download process in the latest version’s release notes,
perform these steps:
1.
2.
On the menu bar, point to
Services & Support
and click
Client Support Portal
.
3.
Log onto the support site.
4.
At
Self Service
, click
Download Software Updates
.
5.
Click
Intraplex
|
NetXpress LX
.
6.
Click the link for the most recent NetXpress LX version.
7.
Click
Save
on the dialog box and save the zipped file to your hard drive.
8.
Open the zipped file and open the release notes.
2.12 Configuration Files Backup and Restoration
The CM-30R module is able to back up and restore configuration files at any time using either the Web
browser interface or SNMP software. CM-30R module configuration is stored in multiple files on the
flash memory (/RFA/cfg). Backup/restoration ability is critical to replacing CM-30R modules. It also
facilitates in the replication of NetXpress LX systems across a network.
Once a CM-30R module is removed from a NetXpress LX shelf, the persistent configuration information
for the system remains with the CM-30R module and is not available to a new module inserted in the
system. This same information can be restored quickly from an FTP server (via network connection) to
the flash memory on the new CM-30R module. The information can also be backed up easily to the
