SB-704 Switchboard Main Station
SB-704 includes all of the features of the MS-704,
with a 4 x 10 assignment matrix in place of the internal
speaker (external speaker required). The 2RU station
features a 10-position slide switch matrix that allows
assignment of any of the 10 intercom lines to any of the
four intercom channels, an isolated separate partyline,
or an off position. Line level program input