Ampex Data Systems ATM 300 Manual De Usuario

 

5

 

Switches and Indicators

 

1.6

Switches and Indicators

 

Table 2 describes the front and rear panel switches and indicators.

 

Table 2. Switches and Indicators

 

Panel

Name

Description

 

Front

DATA FLOW 
(switch)

Determines how the ATM unit responds to a missing 
or invalid OC-3 input.
CONTINUOUS - Continues record and playback 

operations at 155.52 Mbits/sec as 
determined by an internal crystal 
oscillator. This provides a valid OC-3 
output during playback regardless of the 
OC-3 input status. 

GATED - 

Pauses record and playback operations 
until valid OC-3 input is restored.

The ATM unit resumes normal operation after the 
OC-3 input is restored.

TRANSMITTER

EMPTY 

(yellow 
indicator)

Indicates data rate from the tape drive is too slow. 
This is to be expected whenever the tape drive is not 
supplying data.

FULL 

(red indicator)

Indicates data rate from the tape drive is too fast. This 
is an abnormal condition and most likely indicates 
that the tape drive is not using its write input to 
regulate its playback rate (internal playback clock* 
should be disabled).

OK (green 

indicator)

Indicates correct data rate from the tape drive.

RECEIVER OK
(green indicator)

Indicates ATM unit receiving valid OC-3 optical 
signal input.

POWER (green 
indicator)

Indicates ATM unit is powered-up.

POWER (switch)

ON - Powers up the ATM unit.
OFF - Powers down the ATM unit.

Rear TEST 

LOOP 

(switch)

TEST - Self test operation.

NORMAL - Normal operation.

ERROR (red 
indicator)

Indicates (during normal operation) that a valid 
HOTLink input is missing.

RESET (button)

Resets the ATM unit during normal operation.

*For setting internal playback clock options, see DIS Tape Drive or ACL Installation and 
Operation manual.