DEC MicroServer (DEMSA) General Description
The DEC MicroServer is a data communications router providing a synchronous link between an Ethernet and a Wide Area Network (WAN). The DEC MicroServer allows all Ethernet nodes serviced by the DEC MicroServer to access the resources available to the WAN.
The DEC MicroServer accesses different kinds of WANs based on the software that it is running. For example:
• DECnet/SNA Gateway software is loaded to access an SNA Network,
• X25router 2000 software is loaded to access a Packet Switched Network, and
• DECrouter 2000 software is loaded to access a DECnet Network.
Figures 1 through 3 show these three examples.
ETHERNET DECnet NETWORK
MicroServer
ACCESS ROUTINES
---'-'--~ MOD E M
IBM HOST
COMMS CONTROLLER
MKV88-1854
Figure 1 DEC MicroServer Used as a DECnet/SNA Gateway
DEMSA INSTALLATION
ETHERNET DECnet NETWORK
~---~ MODEM
Figure 2 DEC MicroServer Used as an X.25router 2000
MicroServer
~-= !
MKV88-1855
DECnet NETWORK
DECnet NETWORK
ETHERNET
DEMSA INSTALLATION
DEC router 2000 MicroServer
::=:;:.'-
=
!
MKV88-1856
Figure 3 DEC MicroServer Used as a DEC router 2000
DEMSA INSTALLATION
Reference Documentation
Refer to the following documents for more information on the DEC MicroServer.
• Installing the DEC MicroServer
• DEC MicroServer Pocket Service Guide
• DEC MicroServer Maintenance Advisory
• Field Maintenance Print Set DEC MicroServer Hardware Components DEC MicroServer Box:
DEMSA-AA DEMSA-AB Ethernet Connector Cables:
120 V DEC MicroServer 240 V DEC MicroServer
PVC straight connector
EK-DEMSA-IN
PVC right-angle connector Teflon ™ straight connector Teflon ™ right-angle connector PVC office straight connector PVC office right-angle connector Where XX represents:
Synchronous Line Extension Cables: Loopback Test Connectors:
RS-4 22/RS-4 23 Ethernet loop back
Synchronous line loopback (RS-232-C) Synchronous line loopback (RS-423) Synchronous line loopback (RS-422) Synchronous line loopback (V35) Synchronous line loopback (X2I) Data-Rate to Cable-Length Relationships
DEMSA INSTALLATION
Table 1 shows the approximate data-rate/cable-length characteristics of the recommended cables.
Table 1 Data-Rate/Cable-Length Relationships Line Protocol
Maximum Cable Length 15 m (50 ft)
DEMSA INSTALLATION
DEC MicroServer Software Components
The DEC MicroServer software depends on the type of network link it is providing, that is, whether it is
There must be 10 cm (4 in) of ventilation space on either side of the DEC MicroServer. To prevent dust from entering the ventilation slots, place the unit at least 46 cm (18 in) above the floor.
Ensure that the placement of the DEC MicroServer does not block access to a fire exit or to safety equipment. Ensure that the cables do not present a hazard to people walking.
Environmental Requirements
Environmental specifications are shown in Table 2. Make sure that the place where the DEC MicroServer is to be installed meets these specifications.
Table 2 Environmental Specifications Specification
Maximum altitude Temperature range*
Temperature change rate
Relative humidity
* Reduce the maximum temperature specification by 1. 8°C [or each 1000 m (1 OF for each 1000ft) above sea level.
NOTES:
I. If the DEC MicroServer is nonoperational for more than 60 days, it should be in a pJace that meets the DEC MicroServer operating specifications. If it ~s nonopenitional for less th~n60
days, it should be iIi a place that is between -40°C (-40°F) and 66°C (151°F) with a relative humi"ity below 95%.
2.
DEMSA INSTALLATION
Preinstallation Steps
1. Gather the following information.
a. The number of synchronous lines needed b. The synchronous line speed to be used c. The synchronous line cable types to be used d. The synchronous ports to be used
2. Make sure that the place chosen for the installation conforms to the environmental requirements.
3. Check that the following are installed.
a. The Ethernet network
b. A transceiver or DELNI, and cable to connect the DEC MicroServer to the Ethernet c. Synchronous communications lines
d. Modems
4. Clearly label each cable with its function.
DEMSA INSTALLATION
Installation Steps
1. Unpack the DEC MicroServer and verify that all components are included and not damaged.
BUBBLE PACKING (CONTAINS TURNAROUND CONNECTORS MOUNTING BRACKETS AND SCREWS)
DEC MicroServer
SHIPPING CARTON
2. Place the DEC MicroServer in the chosen location.
"INSTALLING THE DEC MicroServer AND DEC MicroServer SYSTEMS CONFIGURATION CARD."
MKV88-1894
DEMSA INSTALLATION
4. Select the correct voltage switch setting by referring to the following diagram.
CAUTION
An incorrect voltage switch setting may damage the DEC MicroServer.
MKV88·1900
DEMSA INSTALLATION
5. Attach the Ethernet loopback connector.
G
-IX)'"
~0[]
CONNECTOR
MKV88-1951
6. Attach the 50-way loop back connector.
DEMSA INSTALLATION
7. Read and remove the yellow label covering the power connector;
8. Attach the power cord to the DEC MicroServer.
9. Insert the power cord into the power socket.
NOTE
If the DEC MicroServer is powered down, wait at least three seconds before powering it up again.
10. Read the display:
a. If the decimal point is not lit and/or the cooling fans are not turning, unplug the power cable immediately and refer to the troubleshooting flowchart (Figure 4) in the Maintenance Aids Section of this option.
b. While the DEC MicroServer is running, a ripple pattern is displayed for approximately 90 seconds.
c. If the display shows F, E, d, or C, a test has failed. See the Troubleshooting discussion in the Maintenance Aids Section of this option.
d. When the display shows a 1 or 3, the DEC MicroServer internal tests have completed successful-ly. The DEC MicroServer is now ready to be connected to the network.
e. If the display shows any other value, power down the DEC MicroServer and go to the Troubleshooting discussion in the Maintenance Aids Section of this option.
DEMSA INSTALLATION
Connecting the DEC MicroServer to the Network
I. Connect the Ethernet cable to the DEC MicroServer.
o DO 0
I I
·:"1I ~
:0
@l~
1.1111 "10'--TO THE LEFT
CD
PUSH LATCH FIRMLY