Chapter 2 - Installation; Unpacking The Unit; Equipment Location; Dry Contact Alarm Relay - TC Communications TC3720 User Manual

Self-healing industrial ethernet fiber optic switch

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Table Of Contents

Table of Contents

Unpacking the Unit

Before unpacking any equipment, inspect all shipping containers for evidence of external damage caused

during transportation. The equipment should also be inspected for damage after it is removed from the

container(s). Claims concerning shipping damage should be made directly to the pertinent shipping agencies.

Any discrepancies should be reported immediately to the Customer Service Department at TC Communi-

cations, Inc.

Equipment Location

The TC3720 should be located in an area that provides adequate light, work space and ventilation. Avoid

locating it next to any equipment that may produce electrical interference or strong magnetic fields, such as

elevator shafts and heavy duty power supplies. As with any electronic equipment, keep the unit from

excessive moisture, heat, vibration and freezing temperatures.

Dry Contact Alarm Relay

Two terminal block connectors on the rear panel (labeled "ALM

RLY1," & "ALM RLY2") provide for the dry contact relay alarm

(see Figure 2). Normally in the OPEN position, any loss of optical

signal will trigger an alarm condition and force the switch to the

CLOSED position. This relay can be used in conjunction with an

external device to monitor the condition of the fiber optic links.

Power Supply

Standard input power is 12V DC @500mA for the TC3720. The power plug is a terminal block connector

with positive & negative polarity indicated on the rear panel of the unit. Two connectors, labeled "PWR A"

& "PWR B" are provided for a built-in power redundancy feature. While only one connection is required

to power the unit, both connectors can be used simultaneously. When power redundancy is utilized, both

power "A" & "B" share the load. If one power supply fails, the other will take over the full load. Alternate

power sources are available as an option (see Chapter 7 - Specifications).

Should an external power adapter need to be replaced, use one with the following specifications: 12V DC

@500mA. You may order it directly from TC Communications.

Power Up Test:

Apply power by plugging the power plug into any power jack on the rear panel. After the power is applied,

the following LED status should be observed from the front panel.

After power up, if no LEDs are lit, refer to Chapter 6 (Troubleshooting).

1. The "PWR A" or "PWR B" LEDs on the front panel will light according to which power jack (A or B)

is connected. Both LEDs will light when power redundancy is utilized.

2. Both "Vcc1" and "Vcc2" LEDs should be solidly lit, indicating an adequate operating voltage is being

derived from the power source.

3. The "100M" & "FULL/COL" LEDs for both F1 and F2 should be solidly lit. The "LINK/ACT" LED

should be Off since there is no Ethernet or optical activity.

4. The "ALARM," "F1/1X," and "F2/2X" LEDs should be flashing indicating that there is no fiber optic

cables connected.

Note: On power up, if the self-healing function is disabled with front panel dip switch #1 in the "Up" position,

the "ALARM" LED will flash and the "F1/1X," and "F2/2X" LEDs will be off. All other LEDs will

behave as indicated above.

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