ADC ACE-COM L1 Connect a BITS Timing Source, WIRING THE COMMON ACCESS PANEL

Installation LTPH-UM-1088-02, Issue 2

WIRING THE COMMON ACCESS PANEL

1Unscrew the common access panel hold-down lugs and remove the cover (see Figure 4).

Bits	Test	CRIT	CRIT	Alarm
	Access	VIS	AUD
B-	TTIP	NO	NO	FE
B+	TRING	COM	COM	MIN
A-	RTIP	NU	NU	MAJ
A+	RRING	Frame	Frame	CRIT
		GND	GND

COM

Figure 4. Wire-Wrap Pin Positions/Common Access Panel (rear view)

Connect a BITS Timing Source

2Determine if you require a BITS timing source connection to the chassis; if so, the chassis must first have a line termination prior to chassis connection.

The BITS concept is used for interoffice synchronization distribution. Each line source, Bits A and Bits B, must be terminated. ADC provides this termination through external termination blocks (product catalog TERM-100) placed on wire-wrap terminal posts on the rear of the ThinMux chassis as shown in Figure 5 on page 9.

8 January 3, 2002 ThinMux Chassis