NEC NDA-24300 manual Speech Path System Changeover via Active GT MBR Key

SYSTEM OPERATIONS

Note: Because this 4-IMG uses multiple TSW and MUX cards, be sure to check all the circuit cards concerned, which are in the same Switching Block.For example, if your system adopts the fully expanded system, you must check a total of 4 TSW cards and a total of 16 MUX cards in this step.

WARNING

Improper key operations may result in a system down. Operate the related keys, using extreme care.

STEP 2 Flip the MBR key on the active GT card. Refer to Figure 6-51.

After STEP 1 and STEP 1.5 are taken, set the MBR key

as shown below. The system changeover starts automatically.

Steady-green

OPE/MB

MB

MBR

ATTENTION

Contents

Static Sensitive

Handling

Precautions Required

1 2

GT (Active)

Figure 6-51 Speech Path System Changeover via Active GT MBR Key

Note: If the MBR and MB keys are turned ON (UP), the GT card is forcibly placed in a make-busy status. Therefore, do not operate the MB key by mistake. Also, after the MBR key is flipped, be sure to return the key to the original position (DOWN).

STEP 3 Confirm the changed lamp indications.

(1)To confirm the imposed Speech Path System changeover, check all the lamps on the cards shown in Figure 6-52, which are in the relevant switching blocks.

Switching Block Formerly Active		After Changeover
TSW ACT	: Steady-ON (green)		OFF
OPE/MB (DLKC)	: Steady-ON (green)		OFF
MUX ACT	: Steady-ON (green)		OFF
Switching Block Formerly STBY		After Changeover
TSW ACT	: OFF		Steady-ON (green)
OPE/MB (DLKC)	: OFF		Steady-ON (green)
MUX ACT	: OFF		Steady-ON (green)

Figure 6-52 LED Indications Before and After Speech Path System Changeover

CHAPTER 6 NDA-24300

Page 470

Issue 1