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ECD » Sharing
Devices » RS-232
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RS-232
Modem Sharing
Devices
MSD-4 AND MSD-8
Speed & ESD Enhanced
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Features/Benefits
- Interface
- EIA RS-232, CCITT V.24, DB-25 Female Connectors
- Data Rates
- Synchronous or Asynchronous up to 128Kbps
- Anti-Streaming
- Automatic or Manual for unattended Circuit Restoral
- Individual
Subchannel Enable / Disable Switches
- Visual Indication
of Subchannel Activity
- Receive
Data - Broadcast to all Subchannels
- Transparent
to Data
- Fully Cascadable
- External
Clocking
- Sturdy Metal
Enclosure
- 110/220VAC
Switch Selectable
- +/-
15KV ESD Protection
- Approvals
- UL and CSA
Description
The Modem Sharing Device
(MSD) products consist of 4 and 8 port units. The MSDs provide the
network manager with a cost effective means of expanding existing,
leased line polled networks without adding computer ports or communications
links. With the MSD's, up to eight terminals 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 either synchronous
or asynchronous network environments, the MSDs are protocol transparent
at data rates up to 128Kbps. Data arriving at the Master Port is
continually broadcast to all Subchannels. The attached terminal
device that raises the RTS control signal is automatically given
control of the MSD until data transmission is complete. Clocking
is accomplished from the attached Modem.
The MSDs incorporate
optional Anti-Streaming circuitry. If enabled, Anti-Streaming will
automatically remove a defective terminal 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 MSDs will provide in excess of 100,000
hours of reliable service.
The MSDs have a three
year warranty and a 24 hour turnaround on warranty repairs.
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Specifications
| Application |
Multiple
Sync/Async terminal or DTE devices operating in a polled environment,
to share one Modem |
| Capacity |
One
to eight RS-232 Sync/Async devices |
| Interface |
EIA
RS-232, CCITT V.24 using DB-25 female connectors, +/-
15KV ESD Protection |
| Data
Rates |
Up
to 128Kbps |
| Data
Format |
Data
transparent at all data rates |
| Timing |
External;
from attached Modem |
| Anti-Streaming |
Automatic
. . .Selectable time out intervals Disable
. . . . .Selectable via dip switch |
| Terminal
Service Modes |
Scanning
or Priority |
| Front
Panel |
Indicators
. . . Power, Transmit Data, Receive Data, Channel Active, Channel
Stream Switches
. . . . Enable/Disable of each Subchannel |
| Power
Source |
100-120
to 200-220VAC @ 10%, 50/60Hz, 0.16/0.08A, external 110/220 volt
select switch, IEC Power Inlet, (2) 5mm Fuses |
| Approvals |
UL
and CSA |
| 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
MSD-4 and
MSD-8 |
Height
. . . . . . . . . . . . . . .1.75 inches (4.44cm) Width
. . . . . . . . . . . . . . . 13.35 inches (33.09 cm)
Length . . . .
. . . . . . . . . . 9.00 inches (22.86 cm) |
| Weight |
MSD-4
and MSD-8 ......... 4.5 pounds (2.1 Kg) |
| Warranty |
Three
Years, Return to Factory |
| ORDERING
INFORMATION |
Model:
MSD-4
Part: 101000
Description: 4 Port Modem Sharing Device Model:
MSD-8
Part: 102000
Description: 8 Port Modem 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 |
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