SYSTEM OPERATIONS

STEP 1 Make sure the active Speech Path System.

(1) Check all the lamp indications in Figure 6-49, which are in the same switching block.

FRONT VIEW

Legend

 

: Lamp is ON

: Lamp is ON

green

green

TSW ACT

MB

TSW MBR

TSW (PH-SW12)

green

OPE/MB

MB

DLKC (PH-PC20)

MUX ACT

MB

MUX (PH-PC36)

TSW: Active

DLKC: Active

MUX: Active

Figure 6-49 TSW/DLKC/MUX in ACT Mode

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

(2)Make sure the STBY mode of mate Speech Path System. Check all the lamp indications in Figure 6-50, which are in the same Switching Block.

The ACT/STBY of Speech Path System can be changed over only when the mate system is in STBY mode. Do not attempt the changeover if the mate Speech Path System is closed.

FRONT VIEW

Legend

: Lamp is OFF

: Lamp is OFF

TSW ACT

MB

TSW MBR

TSW (PH-SW12)

OPE/MB

MB

DLKC (PH-PC20)

MUX ACT

MB

MUX (PH-PC36)

TSW: ST-BY

DLKC: ST-BY

MUX: ST-BY

Figure 6-50 TSW/DLKC/MUX in STBY Mode

NDA-24300CHAPTER 6

Page 469

Issue 1

Page 496
Image 496
NEC NDA-24300 manual 49 TSW/DLKC/MUX in ACT Mode