The DECmux II provides remote terminals with the ability to communicate with the MUXserver 100 through a statistically multiplexed synchronous communications link provided by RS-232-C synchronous modems and the public data network. (This link is referred to throughout this section as the COMPOSITE LINK). The composite links may be either RS-232-C modem or RS-422 long-line drive connections.
- 13.5 in.
(34.3 e m )
-8.8 in . . ( (22.5 oml
4.5 in.
T
(11.43 em)
--.L
CS-5413
Figure 1 DECmux II Statistical Multiplexer
DMXII-1
DECmux II INSTALLATION
Product Configuration
There are two default configurations available on the MUXserver 100 and DECmux II. The MUXserver 100 determines the configuration selected based on the composite link connection.
Configuration Number 1
-• All composite links are factory preset to 9600 baud, RS-232-C, full-duplex modem.
• All asynchronous lines are factory preset to 9600 baud, eight bits, no parity, and one stop bit.
• A partial configuration consisting of either DECmux II is also quite acceptable.
H4000 ETHERNET
MUXserver 1 00
DECmux II
CONNECTS TO A PORT CONNECTS TO B PORT
Figure 2 Default Multiplexer Configuration Number 1
DMXII-2
SUPERVISOR TERMINAL
DECmux II
CS-5378
DECmux II INSTALLATION
Configuration Number 2
-• All composite links are factory preset to 9600 baud, RS-232-C, full-duplex modem.
• All asynchronous lines are factory preset to 9600 baud, eight bits, no parity, and one stop bit.
H4000
MUXserver 100
CONNECTS TO B PORT
ETHERNET
SUPERVISOR TERMINAL
Figure 3 Default Multiplexer Configuration Number 2
DMXII-3
C5-5379
DECmux II INSTALLATION
Refer to the following documents for more information on the DECmux II statistical multiplexer.
•
MUXserver 100 Remote Terminal Server Software AA-JC20A-TE Installation Guide (VMS/MicroVMSj•
MUXserver 100 Remote Terminal Server Software AA-JC19A-TC Installation Guide (RSX-11 M-PLUSj•
MUXserver 100 Remote Terminal Server Software AA-JS34A-TY Installation Guide (Micro/ RSXj•
MUXserver 100 Remote Terminal Server Software AA-JQ09A-TE Installation Guide (ULTRIX-32/32mj•
MUXserver 100 Network Reference Manual EK-DSRZA-RM•
MUXserver 100 Network Installation Manual EK-DSRZA-IN•
MUXserver 100 User's Pocket Guide EK-DSRZA-PG•
MUXserver 100 Network Identification Card EK-DSRZA-ID•
LAT Network Manager's Guide AA-DJ18A-TKComponent List
The following parts are supplied with each DECmux II statistical multiplexer.
• One DECmux II statistical multiplexer
• Eight MUXserver 100 user's pocket guide
DECmux II INSTALLATION
Equipment Placement
The DECmux II can be located in a variety of environments, including offices and computer rooms, and can be stacked in mUltiple installations. Always allow 15 em (6 in) of airspace around air vents, and place the DECmux II at least 45 cm (18 in) above the floor surface.
Environmental Requirements Temperature
Relative Humidity Physical Description Length
Width Height Weight
Power Requirements
5° to 50°C (41° to 122°F) 10% to 95% (nonconden~ing)
34.3 em (13.5 in) 22.5 em (8.8 in) 11.43 cm (4.5 in) 2.95 kg (6.5 lbs)
The operating power range of the DFMZA system is contained in the following table.
Table 1 DFMZA Power Requirements Nominal
Voltage Voltage
Version Required Range Current Frequency
-BA 120 Vac 100 - 120 0.5 A 47 to 63 Hz
-BB 240 Vac 220 - 240 0.3 A 47 to 63 Hz
DMXII-5
DECmux II INSTALLATION
Installation Flow Diagram
UNPACK AND VERIFY ALL COMPONENTS RECEIVED
CONNECT COM-POSITE LINK CABLES TO MODEMS (SEE FIGURE 5)
CONNECT TER-MINAL CABLES (SEE FIGURE 6)
SET TERMINAL PARAMETERS EIGHT BITS, NO PARITY, 9600 BITS/S
VERIFY VOLTAGE SETTING (SEE FIGURE 7)
CONNECT POWER CORD AND SWITCH ON
MKV87-1224
Figure 4 Installation Flow Diagram (Sheet 1 of 2) DMXII-6
VERIFY DECmux II OPERATION
DECmux II INSTALLATION
• MAKE SURE THE COMPOSITE LINK CONNEC-TIONS ARE PROPERLY INSTALLED.
• CHECKTHATTHECOMPOSITE LlNKCONNEC-TED TO THE 'B' PORT CONNECTS TO AN 'A' PORT ON EITHER THE MUXserver 1 00 OR THE DECmux II.
• CHECKTHATTHECOMPOSITE LlNKCONNEC-TED TO THE 'A' PORT CONNECTS TO A 'B' PORT ON EITHER THE MUXserver 1 00 OR THE SECOND DECmux II.
• MAKE SURE THE NULL MODEM CABLES (BC22D) ARE USED TO CONNECT LOCAL TER-MINALS TO THE ASYNCHRONOUS PORTS 0 THROUGH 7.
• ENSURE THAT ANY TERMINAL CONNECTED TO THE ASYNCHRONOUS PORTS OF THE DECmux II ARE PRESETTO 9600 BAUD, EIGHT BITS, NO PARITY.
• VERIFY THAT A CONSTANT GREEN LIGHT IS VISIBLE ABOUT 10 SECONDS AFTER POWER-UP.
• FOR EACH RS-232-C SYNCHRONOUS COM-POSITE LINK CONNECTION TO THE DECmux II, CHECK THAT THE DATA SET READY (DSR) LED IS ON.
MKV87-1225
Figure 4 Installation Flow Diagram (Sheet 2 of 2)
DMXII-7
DECmux II INSTALLATION
A PORT RS-232-C MODEM PORT
B PORT RS-232-C MODEM PORT
TO 2ND
DECmux II TO MUXserver 100
MKV87-1226
Figure 5 Connecting Composite Link Cable - Series Drop Configuration at Two Sites
TO PORT B RS-232-C CABLE (BC17D)
B PORT TO MODEM RS-232-C MODEM PORT
MKV87-1227
Figure 6 Connecting Composite Link Cable - Series Drop Configuration at One Site
DMXII-8
DECmux II INSTALLATION
NOTE
IFTHEVOLTAGESELECTSWITCH POSITION IS CHANGED, THE FUSE AND FUSE CARRIER MUST ALSO BE CHANGED.
MKV87·1228
Figure 7 Voltage Selection Switch and Fuse Carrier
DMXII-9
DECmux II INSTALLATION
Table 2 LED Indicators/Status
LED State
POWER ON
Blinking
OFF
DSR ON
OFF
Indication
This (green) LED indicates that the power supply is OK.
Flashes briefly during power-up indicating that the start-up diag-nostic is running. Goes OFF upon completion and turns ON permanently indicating the DFMZA is operational.
When OFF, this may indicate that the power supply is not opera-tional or malfunctioning.
Indicates successful connection to a modem on the respective composite port.
Indicates that the modem is either in the process of connecting or not connected.
DMXII-IO
DECmux II CABLING
Cabling
Figure 8 illustrates how the DECmux II is connected. There are three cable connections to consider:
• Synchronous composite link cable(s) (BC22F-xx)
• Data terminal cable(s) (BC22D-xx)
• Power cord (the electrical outlet must be within 1.8 m (6 ft) of the DECmux II.)
DATA TERMINAL CABLES
B PORT RS-232-C MODEM PORT
Figure 8 DECmux II Cabling
DMXII-ll
CS-5414
DECmux II DIAGNOSTICS
Diagnostics
There are no loadable diagnostics designed specifically for the DECmux II. There are extensive internal tests designed to check the operation of the DECmux II unit, the synchronous links, and the asynchronous line terminals.
The phases of testing are:
• Self-test of the DECmux II unit executed at power-up.
• Local loop back testing using turnaround connectors.
• Remote loopback testing using a DECmux II unit or MUXserver 100 (see Figure 9).
DECmux II DIAGNOSTICS
DECmux II Diagnostic Summary
The DECmux II diagnostics are evoked through the supervisor terminal by first entering the command processor and then typing TEST following the SYS> prompt.
NOTE
Evoking the Test mode in a DECmux II terminates operation at the multiplexer.
Off-line Test 1 - Basic Option Test - The Basic Option test is a repeat of the DECmux II power-up self-test. When started from the Test Menu, it continuously loops through the test until the HALT (CTRL C) command is given. Each test cycle prints a single line of characters, "012345678*" (refer to Table 3). 2nd firmware ROM checksum Composite ROM checksum Clock test
Silo test
Asynchronous internal loop back Synchronous internal loop back Nonvolatile memory checksum
Off-line Test 2 - Asynchronous Port External Test - It is necessary to fit a loopback connector (PIN H325) to each of the asynchronous ports being tested.
When the Asynchronous Port External test is selected, the operator will be prompted for details of the ports to be tested and their parameters. Enter each parameter followed by a RETURN. This test exercises each port by sending out serial data, which is received immediately on the same port due to the presence of the loopback connector.
The test loops continuously until the HALT (CTRL C) command is executed.
Off-line Test 3 - Asynchronous Internal Logic Test - The Asynchronous Internal Logic test runs immediately after being selected. The number of successful passes of the test are displayed. The test loops continuously until the HALT (CTRL C) command is executed.
The test transmits data over all eight asynchronous ports. The data is looped back internally to the port input and read from the input SILO by the microprocessor. The test can take up to 30 seconds to complete.
DMXII-13
DECmux II DIAGNOSTICS
Off-line Test 4 - Composite External Port Test - This test requests the operator to select the composite port to be tested: A, B, or both. Before typing A, B, or RETURN (both), the loopback connector for the system configuration currently in use must be installed.
Long-Line Drive (RS-422)
1. Attach test cable (P/N 70-20984-01) between the Port A and Port B long-line drive 9-pin connectors.
2. At a remote DECmux II unit, if the remote connection is to a B port, then insert the test cable (70-20984-01) between the B port and the cable end. (Note that the second DECmux II unit must have its B port set to the same speed). If the remote connection is to an A port, then simply connect the test cable to the cable end. This difference is caused by the fact that B ports are the clock source and A ports receive the clock transmitted by the other port.
Off-line Test 5 - Composite Internal Logic Test - This test is the same as Off-line Test 4, except that both channels are always tested and the loopback is internal.
Off-line Test 6 - Broadcast Test/Off-line Test 7 - Echo Test - These tests request the operator to enter details of the ports to be tested and their parameters. After the first asynchronous port details have been
DECmux II MAINTENANCE AIDS Identifying Problems with the DECmux II
This section lists two possible hardware installation problems, probable causes, and what to do to correct the problems. The problems are:
1. No GREEN light.
2. DSR indicators not visible.
SYMPTOM: NO GREEN LIGHT
The GREEN LED start-up indicator located on the front bezel is a three-stage indicator. It indicates power supply OK, start-up diagnostics running, and start-up diagnostics complete.
Following power-up, the LED flashes briefly, indicating that the power supply is OK. The indicator then turns OFF for several seconds indicating that the start-up diagnostic is being run. On successful completion of the start-up diagnostic, the indicator turns ON permanently, indicating the DFMZA is now operational.
If the start-up indicator follows any pattern other than the one described above, turn the DECmux II main power OFF, wait 20 seconds, and reapply the main power. If the second attempt is not successful, the unit is faulty and requires service.
Table 4 No GREEN Light Probable Cause
DECmux II power cable is not connected securely No power in wall outlet Incorrect voltage switch setting
DECmux II fuse is defective
What To Do
Check power cable at both ends.
Check outlet with a working device (such as a lamp).
Check that the voltage select switch on the back of the DECmux II is set at the correct voltage setting. Unplug the power cord before changing it.
Unplug the power cord and replace fuse.
DMXII-15