Specifications

Elastic Networks 1 BitStorm 1900 Access Multiplexer
08-01101-01, Rev. 1.50 BitStorm 1900™ Installation and Maintenance Guide 1-9
Spectrum Manager operates under five modes of operation:
Spectrum Manager-Video Protect
The Spectrum Manager-Video Protect activates the EtherLoop asym-
metrical operation with all upstream traffic limited to a training speed
of 16 (1.8Mbps) on the BitStorm 6306 and 10306 CO modems. Down-
stream traffic continues to run as fast as the loop conditions allow.
When this feature is enabled all nearby EtherLoop lines running high-
speed video downstreams are protected. All CO modems at a site are
required to have the feature enabled by StormTracker Site Manager or
EMS via the MIU SNMP agent.
Passes VLAN Tagged Frames
The BitStorm 1900 is capable of passing 802.1Q tagged Ethernet
frames of 1522 bytes. To implement a VLAN solution, a 802.1Q tag-
ging switch must exist upstream. Also, an 802.1Q tagging switch or
device must be present on the customer end of the CPE modem.
Mode Description
Native EtherLoop operates without the analysis of other
service activity in the individual loops.
Monitor Spectrum Manager analyzes other services in the
loop that may limit EtherLoop performance.
Forced EtherLoop provides optimum spectrally compati-
ble performance with asymmetric services in the
individual loop that may temporarily affect Ether-
Loop’s upstream capability. In this mode, Ether-
Loop is forced to “mimic” asymmetric DSL.
Auto-Protect EtherLoop operates in an Asymmetric Mode if
asymmetric interferers are present. EtherLoop
returns to normal upstream operations once the
interference is gone.
Video Protect EtherLoop operates in a forced Asymmetric
Mode with guaranteed high downstream band-
width for the delivery of streaming video applica-
tions.