Toshiba CTX28 manual RDTU1A

T1

RDTU1 & 2 - T1 Interface Unit

		Strata CTX
		Processor PCB
		Synchronization
		Circuit
		Time
	Clock	Switch
Digital			Primary Reference PCB*
						Public Switched
Telephone	PDKU			Synchronization	Line 1
						Telephone
			SS1	Circuit		Network (PSTN)
				Digital Voice		PRI, BRI, or T1
		Path
Standard				Path
		Voice
Telephone	RSTU		Secondary Reference PCB*
		Transmission		Synchronization	Line 2	AT&T or	Stratum-1
						other provider	Clock
			SS2	Circuit		PRI, BRI, or T1	Source
				Digital Voice
				Path
		Digital				Clock synchronized properly
			Other RDTU, RPTU, or RBSU			with Stratum-1 Clock Source
		CTX		Synchronization	Line 3	Other	Other
			SS3	Circuit
						PRI, BRI, or T1	Clock
				Digital Voice		provider	Source
				Path
	5439				Clock not synchronized properly
					with Stratum-1 Clock Source

Figure 8-6 RDTU Primary/Secondary Reference Block Diagram

LED Status Indicators

BSY

FLAM MFALM YALM BALM

PSYNC SSYNC

CD3

CD7

CD6

CD5 CD4

CD2 CD1

P3LLB P4RLB

OFF ON OFF ON

P3: Future Use

P4: Remote Loop Back Test

Equalizer

Setting Switch

			SW1						P6
		S1				OFF		S8
		OFF			OFF
	LB			P2			P1
RDTU1A		ON			ON

6396

P1, P2: Self Test Network

Figure 8-7 RDTU1A PCB (RDTU2 is similar)

8-16 Strata CTX I&M 06/04