Features / Benefits
- Interface - EIA RS-530, DB-25 Female Connectors
- Data Rates – Synch or Async to 2.048Mbps
- Transparent to Data
- Clocking: Input Port or Port 1 or Port 2 EXT Clock Pins 24,11
- Handshaking – RTS / CTS or Switch on Data, Option for selectable RTS Holdover via Dip Switch
- Anti-Streaming – Automatic or Manual for unattended Circuit Restoral
- Receive Data Broadcast to all Sub-channel Ports
- Individual Sub-channel Enable / Disable Switches
- 110/220VAC Switch Selectable
- Safety: meets new 62368-1
- Standalone Chassis or 1U Rackmount Options
Description
The MSD-2 RS-530 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 MSD-2, two 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 MSD-2 is protocol transparent at data rates up to 2.048Mbps. Data arriving at the Master Port is continually broadcast to all Sub-channels. The user is presented with two modes of operation for terminal access. The first mode is the attached terminal device(s) that raises the RTS control signal receives CTS back and is automatically given control of the MSD channel until data transmission is complete. The second mode is the attached terminal device(s) that transition data from Mark to Hold is automatically given control of the MSD until data transmission is complete. This is commonly called the “OR” mode of operation. Clocking in both modes of operation is accomplished from the attached Modem. The unit also supports EXT clocking on sub-channel Ports A/B on pins 24,11 and these clocks may be the same rate or clocked separate rates. The MSD-2 may also be used in broadcast only applications.
The MSD-2 RS-530 features an optional RTS hold over circuit with selectable RTS hold over delay times via 4-position dip Switch. If delay is enabled, when RTS is dropped from the attached sub-channel A or B, the port retains control of the channel until the pre-set time expires. Then either sub-channel can access the master port by raising RTS.
The MSD-2 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 clock selection period.
Housed in a sturdy metal enclosure and equipped with a 110/220 VAC switch selectable linear power supply, the MSD-2 RS-530 will provide more than 100,000 hours of reliable service.
SPECIFICATIONS |
|
| Application |
Multiple sync/async terminal or DTE devices operating in a polled environment, to share one Modem. |
| Capacity | Standalone: One Master Port Input Port and 2-Ports for attached RS-530 Sync/Async devices 1U Rackmount: Houses two MSD-2 Units per 1U Chassis, each with its own internal linear power supply and each with IEC Power Inlet and each with its own 110/220VAC Power Switch |
| Interface |
Three EIA RS-530 via DB-25 female connectors
|
| Data Rates | Up to 2.048Mbps |
| Data Format |
Data transparent at all data rates |
| Timing |
External Master Port Input; from attached Modem EXT Timing Support via Port-A / B on pins 24,11 Port-A & Port-B EXT timing may be the same or different clock rates to allow independent clocking |
| Handshaking |
RTS / CTS OR-MODE (Switch on Data) |
| Anti-Streaming | Automatic…Selectable time out intervals Disable……Selectable via dip switch |
| Terminal Service Modes | Rotational sequence for equal access Priority Mode Optional via Dip Switch |
| Front Panel |
Indicators: Power, CTS, DCD, RXD, TXD |
| Power Source - Power Draw |
100-120 to 200-220VAC @10%, 50/60Hz, 0.16/0.08A, external 110/220 volt select switch, IEC Power Inlet, (2) 5mm Fuses @120VAC 60Hz, 0.02 AMP, 1.9 Watts, 3.3VA |
| Environmental | Operating Temperature: 50º to 160º F (10º to 60º C) Operational Alt.: 0 to 10,0008 Feet above sea level Operational Relative Humidity: 10% to 80% Non-Operational Temperature: -30 degC to 70 degC Non-Operational Alt.: 0 to 50,000 feet above sea level |
| Dimensions 1U Rackmount Tray |
MSD-2_Dual-1U or MSD-2_Single-1U Height ....... 1.75 inches (4.445 CM) Width ........ 17.00 inches (43.180 CM) Depth ....... 9.00 inches (22.860 CM) |
| Dimensions Standalone Chassis |
MSD-2 |
| Weight |
MSD-2 Standalone Chassis: 3 Pounds (1.36Kg) MSD- 2_Dual 1U Rackmount Chassis: 7 Pounds (3.175Kg) MSD-2_Single 1U Rackmount Chassis: 3.5 Pounds (1.587Kg) |
| Warranty | Three Years, Return to Factory |
| MTBF | 601,328 Hours Benign Ground, Controlled, Telcordia Issue 1 |
| Approvals | EMI Approvals FCC 47CFR, Part 15, Subpart B for conducted emissions from a Class A FCC 47CFR, Part 15, Subpart B for radiated emissions from a Class A |
| Safety Approvals | Meets UL 62368-1 |
| Ordering Information |
1U Rackmount Chassis – Two Units Per Tray |
|
1U Rackmount Chassis – One Unit Per Tray Ordering Part Number: 274000-B |
|
| Standalone Chassis
Ordering Part Number: 272000-B Model: MSD-2_ Standalone RS-530 Description: MSD-2 RS-530 Standalone Chassis |
|
| Included with each unit: |
1) Operations Manual |
| Optional Accessories | 1) Spare Data Center Fuses A) 160ma Fuse, Qty (2) Part # 714000 B) 80ma Fuse, Qty (2) Part # 714001 |
