Specifications

Elastic Networks 1 BitStorm 1900 Access Multiplexer
08-01101-01, Rev. 1.50 BitStorm 1900™ Installation and Maintenance Guide 1-3
The BitStorm 1900 shelf and components are installed in a standard
19” rack and can be installed in 23” racks using optional 23” mounting
ears. Up to five (5) BS1900 Systems can be installed into one rack
depending on the application and the associated required components.
Refer to "Appendix B: Cabling Specifications‚" on page 143 for typical
rack configurations.
Depending on the application/configuration, the following components
are installed in the rack with the BitStorm 1900 Shelf to comprise the
system:
Air Baffle
The Air Baffle, installed above the Filter Shelf (or the BitStorm 1900
Shelf), is used to deflect the exhaust air flow out the rear of the rack.
When more than one BS1900 system is installed in a rack, the Air Baf-
fle prevents the heated exhaust air of one BS1900 system from being
drawn into the Fan Shelf of the BS1900 system installed above.
Fan Tray
The Fan Tray Shelf provides forced-air cooling throughout the BS1900
system. A Fan Tray is installed under each BS1900 Shelf and contains
six forced-air cooling fans to ensure sufficient cooling for the entire
system. The -48 V DC Fan Tray is ideal for the CO (Central Office) and
the 110/220 V AC Fan Tray has been uniquely designed for enterprise
applications. Fan Trays are not required in 4212 only configurations as
the power supply is a lower wattage.
Filter Shelf Option
The Filter Shelf contains low-pass filter cards to separate out-of voice-
band signals from the voiceband traffic between the BitStorm modems
and the external voice facility equipment. Filter shelves contains one
filter card for each modem card installed in the BS1900 shelf (up to
10). Depending on the application, more than one Filter Shelf can be
installed, one top of another.