AT&T AT&T manual Emergency Transfer Unit Connections, 192

SYSTEM 25

CABINET

TRUNK

PORT

CALL

PROCESSOR

STATION

PORT

ETU

ETU

TO

SWITCH

ETU

TO

25-PAIR

(TRUNK)

CO

TAE

CENTRAL

—

—

—

—

—

—

—

—

—

OFFICE

-48V

❑ CPU

25-PAIR

TO

❑ ADDITIONALETU

ADDITIONAL

ETUs

ETU

TO

SWITCH

ETU

TO

OCTOPUS

25-PAIR

(LINE)

CABLE

—

—

—

—

—

—

—

—

—

PART OF SIP

858A

ADAPT.

UP TO FIVE POWER FAILURE TRANSFER (PFT) STATIONS (REGISTERED SINGLE-LINE)

(a)ETU CONNECTIONS (DASHED LINES) NORMAL OPERATION - (NO PFT) (TRUNK SUPPORTS STANDARD CO CALLS)

ETU

			TAE
-48V REMOVED	❑
		25-PAIR

❑

CENTRAL

OFFICE

TO PFT

STATION

(b) ETU CONNECTIONS (DASHED LINES) ON PFT

Figure 2-36. Emergency Transfer Unit Connections

2-192