Digi MIL-120A User Manual

MIL-120A

Thin•Twist

COAX to 10BASE-T

Media Converter

12-20VAC

COL/TP

THIN•TWIST

Model MIL•120A

COAX to 10BaseT

CONVERTER

Ethernet / IEEE 802.3

FCC PART 15 CLASS A COMPLIANT

RCV/TP

LINK

POWER

RCV/CX

COL/CX

Installation Guide

This guide includes the following information:

“Installation” on page 2
“Link Test” on page 2
“Disabling Link” on page 2
“Diagnostic LEDs” on page 3
“Configuration” on page 3
“RJ-45 Pinouts” on page 3
“Legal” on page 4

Doc #: 75140 Rev. D

Install Guide

Installation

Do the following to install the MIL-120A:

1. Attach a UTP cable from the network to the MIL-120A's RJ-45 port

2. Attach a T-type BNC connector from the network cabling to the BNC
connector

3. Connect the power adapter's cord from the power source to the unit

Note:

Use shielded twisted pair (CAT 5) cabling for CISPR 22 B installation.

Link Test

The MIL-120A provides a
MIL-120A ships with the

Link

test function, which is a 10BASE-T standard. The

Link

function test “enabled”—only pin one jumpered

with a jumper block. This allows the LEDs to illuminate when there are links.

Disabling Link

To disable the

Link

test:

1. Use a Phillips-head screwdriver to remove the four Phillips-type screws
located on the sides of the unit

2. Remove the BNC nut and its washer

3. Slide the housing off, over the BNC connector

Link

4. Locate the two-pin

jumper (Figure 1)

5. Place the jumper block onto both pins

6. Reassemble the unit (reverse steps 1 through 3)

Note:

Model: MIL-120A 2

The MIL-120A operates in a “StarLAN-10” environment when

Power and Link LEDs Illuminate.

Link Test
Enabled

Figure 1.Link and DIP Switch Locations

LINK

1 2

DIP Switch

Link

is disabled. Only the

Install Guide

Diagnostic LEDs

COL/TP: Collisions are occurring on the 10BASE-T network
RCV/TP Unit is receiving packets from the 10BASE-T network
Link:

Power:

There is an active connection to a10BASE-T hub (or another node)
when

Link is enabled

Unit is receiving power

RCV/CX Unit is receiving packets from the 10BASE2 network
COL/CX: Collisions are occurring on the 10BASE2 network

Configuration

Next to the COAX cable connector, there is a DIP switch that control the 50 ohm
termination resistor (Figure 1). These switches support a variety of configurations.
Both switches are shipped in the UP position (default). Other configurations
include:

If the MIL-120A is connected to the end of a multi-node segment without a T­connector and terminator, enable the 50 ohm resistor by:

• Placing switch 1: UP and

• Placing switch 2: DOWN

If the MIL-120A is connected to a single-node “without” a T-type connector and
terminator on a COAX cable of less than one meter’s length:

• Place both switches (1 and 2) in the DOWN position

Note:

For this configuration, you do not need a 50 ohm terminator on the COAX segment of the
MIL-120A's BNC connector.

RJ-45 Pinouts

4

5

3

2

1

6

7

8

MDI

Pin 1=TX+

Pin 2=TX-

Pin 3=RX+

Pin 6=RX-

Follow these guidelines when connecting the 10BASE-T Port:

• For a Hub or a Repeater, use a straight-through cable (where the pins are
connected 1 to 1, 2 to 2, 3 to 3, and 6 to 6)

• For a Workstation/PC port, use a swap cable (where the pins are connected 1
to 3, 2 to 6, 3 to 1, 6 to 2)

Figure 2. RJ-45 Pinouts

Model: MIL-120A 3

Legal

Regulatory Approvals

• FCC Class A

• UL 1950

• CSA 22 No. 950

• EN60950

• CE

– EN55022 Class B
– EN50082-1

Canadian EMI Notice

This Class A digital apparatus meets all the requirements of the Canadian Interference-Causing
Equipment Regulations.

Cet appareil numérique de la classe A respecte toutes les exigences du Règlement sur le matériel
brouilleur du Canada.

European Notice

Products with the CE Marking comply with both the EMC Directive (89/336/EEC) and the Low Voltage
Directive (73/23/EEC) issued by the commission of the European Community. Compliance with these
directives implies conformity to the following European Norms:

• EN55022 (CISPR 22) - Radio Frequency Interference

• EN50082-1 (IEC801-2, IEC801-3, IEC801-4) - Electromagnetic Immunity

• EN60950 (IEC950) - Product Safety

Digi International warrants to the original consumer or purchaser that each of its
products, and all components thereof, will be free from defects in material and/or
workmanship for a period of five years from the original factory shipment date. Any
warranty hereunder is extended to the original consumer or purchaser and is not
assignable.

Digi makes no express or implied warranties including, but not limited to, any implied
warranty of merchantability or fitness for a particular purpose, except as expressly set
forth in this warranty. In no event shall Digi be liable for incidental or consequential
damages, costs, or expenses arising out of or in connection with the performance of the
product delivered hereunder. Digi will in no case cover damages arising out of the
product being used in a negligent fashion or manner.

To Contact Digi

For prompt response when calling for service information, have the following information ready:

• Product serial number and rev.

• Date of purchase

• Vendor or place of purchase

Reach Digi Technical Support at 408/744-2751
Or E-mail at “[e-mail]”

Address: 1299 Orleans Drive

Sunnyvale, CA 94089
Voice: 408/744-2775
Fax: [phone]
E-mail: [e-mail]

Five-Year Limited Warranty

Doc #: 75140 Rev. D