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CHAPTER 4 NDA-24300
Page 272
Issue 1
UNIT/CIRCUIT CARD REPLACEMENT PROCEDURE
2.3.2 TSW Card Replacement Procedure
The TSW (PH-SW12) card is located in the Slot Nos. ranging from 12 to 19 within the TSWM.
Equipped with the Time Division Switch (TSW) and Speech Path Controlling Interface (INT), the
card’s main function is to provide a maximum of 8192 × 2048 Time Slot (TS) switching for a desig-
nated single IMG. Because a single TSW card only enables the TS switching associated with a single,
individual IMG alone, note that the fully expanded 4-IMG system requires a total of 4 TSW cards
when it adopts a single configuration, or as many as 8 in the case of dual configuration. If your system
adopts the latter’s dual configuration, the card’s replacement procedures are as follows:
Note:
To replace a TSW card in dual configuration, the system of the card must be changed over from ACT to
STBY mode. The changeover can be done by flipping the MBR key on the active GT (PH-GT09) card
or by using the CMOD command. For more details, refer to Section 12, System Control Procedures, in
Chapter 6.
Figure 4-16 provides the system block diagram centering upon the TSW cards. If the system of TSW/
INT is changed over, the ACT/STBY of DLKC and MUX in the same switching block are also totally
changed over. The changeover can be performed by flipping the MBR key on the active GT (PH-GT09)
card, or by using the CMOD command.