DESCRIPTION
The Digital Mixing Module (DMM-4) is a network expansion
device for modem sharing or port sharing applications in polled
or contention environments. The DMM-4 allows up to four devices
to share a modem/DSU or computer port. Any combination of
terminals and modems may be used in a network environment.
Each port of the DMM-4 may be selected as a DCE or DTE interface.
Once installed, system and network efficiency are increased
through higher host processor utilization coupled with the
significant decrease in idle time between host / terminal
traffic sessions.
Ideal for either synchronous or asynchronous network environments,
the DMM-4 is protocol transparent at data rates up to 128Kbps.
The DMM-4 may be configured to provide clocking for the entire
network. To prevent data transmission errors caused by clock
differentials throughout the network, an 8 bit buffer is provided.
In applications where the master port and the selected port
provide their own clocks, data is clocked into the buffer
at the receive clock rate of the active port and clocked out
using the master port transmit clock.
In applications where the Clear To Send control signal is
not provided by the master port, an artificial RTS/CTS is
available. Additionally, several RTS/CTS delay settings are
available.
The DMM-4 provides optional Anti-Streaming circuitry. Once
enabled, Anti-Streaming will automatically remove a defective
terminal or modem from service if the Data / Control criteria
is present for the user predefined selection period.
Housed in a sturdy metal enclosure and equipped with an internal
110/220VAC switch selectable linear power supply, the DMM-4
will provide in excess of 100,000 hours of reliable service.
The DMM-4 has a three year warranty and a 24 hour turnaround
on warranty repairs.
|
