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700A NETWORK
INTERFACE BLOCK
DIGITAL SWITCH
(66-, OR 11O-TYPE)
CO
TRUNK CP
CO
TRUNK CP
CO
NETWORK
ACCESS
CO TRUNKS
RJ2x1
TRUNK CP
CO
TRUNK CP
CO
TRUNK CP
CENTRAL
OFFICE
C2
CO
ANALOG
STATION CP
C1
PART OF
OCTOPUS CABLE
———
CPU
ETU
(3)
———
———
CALL PROCESSOR
GROUND
TRUNK CP
●
LEG 7
●
PART OF SIP
TO SINGLE
-48V DC
POINT GROUND
PFT STATION
"
"
FROM
"
●
VOICE TERMINALS
LEGEND :
(4 PAIR
"
A - SINGLE ENDED 25
BUILDING WIRE)
NON-PFT STATION
C1
●
LEG 8
CPU
ETU
(2)
GROUND
CPU
ETU
(4)
GROUND
-48V DC
"
"
NOTES :
1. TRUNK AND STATION CONNECTIONS TO ETU 2-4 ARE SIMILAR TO ETU (l).
2. THREE OF EIGHT STATION LINES (FROM ANALOG STATION CP) AND THREE OF EIGHT TRUNKS
(FROM CO TRUNK CP) WHEN USED ARE "FED-THROUGH" ETU, THEY ARE NOT SWITCHED IN THE EVENT
OF A POWER FAILURE.
3. MAXIMUM ETU(S) = 4, MAXIMUM PFT STATIONS PER ETU = 5.
Figure 2-37. Multiple ETU Arrangements
PAIR CABLE (A25D)
B - 3 TO 1 SPLITTER
CABLE (OR 6016)
C1 - MODULAR CORD (D8W-87)
C2 - OCTOPUS CABLE (WP9078O)
D - 25 PAIR CONNECTORIZED
CABLE (B25A)
2-193