DESCRIPTION
The Digital Mixing Module X.21 (DMM-X21) 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, up to 4 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 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 until data transmission is complete. Clocking is accomplished
from the attached Digital Modem.
The DMM-X21 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 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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