The Digital Mixing Module DMM-X21 is a x.21 digital sharing device or x.21 port sharing device for modem sharing or port sharing applications in polled, contention and broadcast environments. The DMM-X21 allows up to four X.21devices to share a modem or computer port. Each port is DCE/DTE selectable and has optional 512 bit tail circuit buffers for each port. The Device also supports multiple port broadcasting and fall-back and forward clocking. Data rates of up to 1.024 Mbps are supported. CE APPROVED for Europe.
The X.21 Digital Sharing Device (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