ECD » Sharing
Devices » DMM-X21/2
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DMM-X21/2
Digital Mixing Module
ITU X.21 |
Features/Benefits
- Interface
- X.21, ITU V.11, (3) DB-15 Female Connectors
- Data Rates
- Synchronous up to 1.024Mbps
- Anti-Streaming
- Automatic or Manual for unattended Circuit Restoral
- Individual
Subchannel Enable/ Disable Switches
- Integral
Elastic Tail Circuit Buffer - FIFO capable of 512 bits per channel
- Up to Two
DTE or DCE's per Link
- Transparent
to Data
- Supports
Fall Back Clocking
- Sturdy Metal
Enclosure
- 110/220VAC
Switch Selectable
- UL 1950 and
CE Approved
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 landline applications.
The DMM-X21
is equipped with an internal 110/220VAC switch selectable linear
power supply and has a three year warranty.
|
Specifications
| Application |
Multiple
X.21 Synchronous DCE or DTE devices contending in a polled
environment, to share one Digital DCE or DTE interface |
| Capacity |
Up
to Two X.21/2 devices |
| Interface |
X.21,
V.11 Compliant using DB-15 female connectors |
| Data
Rates |
Up
to 1.024Mbps |
| Data
Format |
Data
transparent at all data rates |
| Timing |
From
Composite (Master) Port, Sub-channel Port 1
or Port 4 |
| Buffers |
Optional
Unidirectional 8 bit buffer 512 bits per channel |
| Anti-Streaming |
Automatic.....Selectable
time out intervals Disable.........Selectable
via dip switch |
| Front
Panel |
Indicators....Power,
Send/Receive Data, Channel Active, Channel Stream
Switches.....Enable/Disable
of each Subchannel |
| Power
Source |
100-120
to 200-220VAC @10%, 50/60Hz, 0.32/0.16A, external 110/220
volt select switch, IEC Power Inlet, (2) 5mm Fuses |
| Environmental |
Operating
Temperature . .32º to 122º F (0º to 50º
C) Relative
Humidity.. . . . . . .5 to 95% Non-Condensing
Altitude. . .
. . . . . . . . . . ... .0 to 10,000 feet |
| Dimensions |
Height
....... 1.75 inches (4.44 cm) Width
........ 13.35 inches (33.90 cm)
Length .......
9.00 inches (22.86 cm) |
| Weight |
4.5
pounds (2.1Kg) |
| Warranty |
Three
Years, Return to Factory |
| Approvals |
UL
1950, CE Approval, FCC Class A |
| Ordering
Information: |
Model:
DMM-X21/2
Part: 137000
Description: 2 Port X.21 Digital Sharing Device |
| Included
with each unit: |
1)
Operations Manual 2)
U.S.A. Grounded Power Cord, Part # 713015 |
| Options |
1)
Optional Power Cords
....A)
United Kingdom, Part # 713016
....B)
Continental Europe, Part # 713017
....C)
Other: Specify Country on Purchase Order
OPTIONAL ACCESSORIES
2) Spare Data
Center Fuses
....A)
160ma Fuse, Qty (2) Part # 714000
....B)
80ma Fuse, Qty (2) Part # 714001 |
|
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