DESCRIPTION
The Digital Mixing Module X.21/2 (DMM-X21/2) provides the
network manager with a cost effective means of expanding existing,
leased line polled networks without adding computer ports
or communications links. With the DMM-X21/2, up to 2 DTE or
DCE devices can share the same port and communications link
using the contention and control protocols normally resident
in the host hardware and software.
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 synchronous network environments, the DMM-X21/2
is protocol transparent at data rates up to 1.024Mbps. Data
arriving at the Master Port is continually broadcast to all
Subchannels. The attached terminal device that raises the
Control (C) or Indicate (I) signal is automatically given
control of the DMM-X21/2 until data transmission is complete.
Clocking is accomplished from the attached Digital Modem.
The DMM-X21/2 incorporates optional Anti-Streaming circuitry.
If enabled, Anti-Streaming will automatically remove a defective
terminal from service if the Control (C) or Indicate (I) signal
is present longer than the user predefined selection period.
Elastic Tail Circuit Buffers compensate for systems having
different clock sources. Large 512 bit buffers enable the
DMM-X21/2 as an ideal choice for VSAT or land line applications.
The DMM-X21 is equipped with an internal 110/220VAC switch
selectable linear power supply and has a three year warranty.
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