1.1DESCRIPTION
The Model CM3W is a console mount, t w h l intercom user station. The Model RMUX) is a rack mnmt,
Confereuce Line IntMcom Svstem (Figure
A conf- line intercom sysIem allows a group of people to talk and listrn on a single chaaael. On this
c ~ , a l l u s e r s a n l i s t r n w h e ~ a n r e o r m m o t b s r
users are talking (eonf&g). | Up to 75 usns csn |
share the same dermc8 line (or confcrma bus).
On the Model CM300/Rhi3w, a latching switch or momentary pushbutton tums the microphone on.
The mommtary push hutton allows quick bursts of communication, especially useful in a high noise mvi- ronmmt. Ihe latched position allows 'hpnds fne' op
do n , when the llscr aeuls to have two way conversation while paformiDga n o k activity.
The Channel Select Switch
A chmnel sdector switch allows a choice of two (optionally three) ch.nnels. Whm the switch is on the 'I'
positionthestationtalksandlistensonchnollcl1,onthe
"2' position, channel 2, and m on. On larger systems the '1' position may be any system channel (1 through 12 for example). Similarly, for position "2'. See Section 2.1 for DC powering rsqoinmeats under these conditions.
|
| Call Li& PushButtog (CM3WL/RM3WL, only) |
Full duplex @on | allows two way conversation at | Pushing this button transmits a mll signal to all other units |
t h e ~ t i m e , t h a t i s , o n e u s e r ~ ~ t a s s o n ond the chmnel selected by the c b l selector switch. A all signal on this &amel will cause the all light push buttontotlash. ~ & p s h r a t e i s 2 t o 5 t i m D s a p e c o m d .
The CM3W/RM3W, with a hedset, intcrhces a hurmn The allsignal itaclf is a 20 kilohertz signal.
usertotheinintaoomsystem. Tbeusertdksandlirtms using the head& (or a hmdsst). The headset umnects to
umnector ( o p t b d l y five or six pin). The CM3W/RM3W uneeds to the systsm using a t h e conductor
"mi-type cable. me CM3w/RM3w wataiU6 four ~011tmIs:the volum anmoll,the latching microphone switch, the momntary microphone switch, md the chanael select switch. On the Model CM3W/RM300L, the momentary microphone switch is replaced with the all tight button.
Volume Control
The volum wntrol on the CM3WlRM3W has a wide range to canpensote for: user he&$ differences, ambi- ent noise variation, variations in headse4 I haadset d- tivity. and variations in voice. The volume watrol in the CM3W/RM3W mhtcea distortion by driving the headphone amplifier oaly as much asneeded.
In n o d system opention, one a nrole users talk and the othm listen. A microphone switch on each station allows the talker's microphone to he mabled and allows the listmas to keep their microphones disabled. In this condition, speech intelligibility is euhanced since backgmund noise from other microphones is not present.
The CM3MYRMUK) .ad CM3WLRM3WL use the CC33 card ere# u idhated bclow. Codcl at the cad of each pngnph iadiatc thc cud d.Codcl ue: *CC33 u r d , **CW card. MCC(5 cud. (CC33 sehemtic i SD1464, CCWCC45
.ohcrmticis SD1427).
f o l h thc duancl selector. The Mi knob i the
wnncUionr. A dual W& ptentiomcta with two knobs
pmvidu rcp.ntclevel controls for intercom md pmgnm.
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