Paradyne COMSPHERE 3920Plus Technical Reference Manual page 15

Model 3920Plus Standalone Multiport Modem
The Model 3920Plus multiport is a standalone modem (Figure 1-2), with an integral time division
multiplexer (TDM) and a modem sharing device (MSD) as standard equipment. The TDM
provides time division multiplexing of up to four independent ports over point-to-point lines using
the V.34 family or V.32 family modulation. The MSD allows multiple physical ports on a tributary
modem to share a single communication channel using the V.34 family, V.32 family, or TMp
modulation. The TDM/MSD multiplexer (commonly referred to as "mux") can be enabled or
disabled to allow a greater degree of application flexibility.
The 3920Plus multiport modem also operates over a 4-wire/2-wire leased or dial network and is
controlled using the same DCP employed on the Model 3920Plus singleport standalone modem.
Model 3920Plus Singleport and
Multiport Housing
Singleport Modem
Back Panel
Figure 1-2. 3920-A1 Standalone Singleport and Multiport Modems
3920-A2-GH30-40
DIAGNOSTIC
CONTROL
PANEL
SPEAKER
STATUS
INDICATORS
POWER
ON/OFF
POWER IN
NMS
DTE 1
DIAL
LEASED
LCD AND
KEYPAD
POWER
CORD
Multiport Modem
Back Panel
DTE 4
DTE 3
DTE 2
DIAL
LEASED
October 1998
Chapter Title
POWER
SUPPLY
POWER
ON/OFF
POWER IN
NMS
DTE 1
496-14684-01
1-3