![Nortel NT5D12 Installation Manual Download Page 61](http://html1.mh-extra.com/html/nortel/nt5d12/nt5d12_installation-manual_1706448061.webp)
PRI installation: NT, 51/51C, 61/61C
Page 49 of 188
ISDN PRI Installation
Figure 13
Half group cabling without Echo Canceller
QPC414
Note 3
J4
J6
RS232
T1
Note 1: Maximum cable distance from PRI card to DS-1 cross connect is 655 ft.
Note 2: Maximum cable distance from PRI card to LD-1 is 750 ft.
Note 3: QPC720 does not interface with NT8D04 Superloop Network Card.
QPC720
PRI Card
(Primary reference)
J3
QCAD124 or NT8D85xx
LOOP
J1
J2
J5
D-CH
REF2
REF1
QCAD130 or NT8D79xx
QCAD130 or NT8D79xx to
PRI Card—Secondary Reference
QPC471
Clock
Controller 0
J3
J1
J2
QCAD328A or NTND26
QPC757
or NT6D80
J2
QCAD128 or
QCAD133 or
NT8D83xx
Cabinet
I/O Panel
QCAD133 or
NT8D97Ax
DS-1
Cross-Connect
LD-1
Note 2
Note 1
No connection
553-1389
No connection