Installation manual

Hardware overview/installation IVX 128
B.16
CO line connection
Local loop
IVX's advanced CO line circuitry provides for open loop detection and IVX’s built-in Caller ID inter-
face. Loop start lines are connected via the last 6 pairs on each 66 block on the 612 and 684 cards.
Note:
Observe correct order of connection to preserve proper rotary hunting of the CO lines.
T1
Up to 24 CO line interfaces (selectable as loop start lines or ground start trunks) are connected
through two pairs punched down on the 66 block connector of the DLC12 card.
Up to two DLC12 cards can be installed. Note that the total line capacity of the system is 66.
Line numbering plan
If a DLC12 card is not used, the line number will begin with 1 on the first port card and end with 42
on the last port card.
Port card Line numbers
1
1 through 6
2
7 through 12
3
13 through 18
4
19 through 24
5
25 through 30
6
31 through 36
7
37 through 42
Allocate 24 CO line numbers for each DLC12 card and continue the numbering on the next card. The
example below shows a DLC12 card as the fourth card.
Port card Card type Line numbers
1
684 1 through 6
2
684 7 through 12
3
612 13 through 18
4
DLC12 19 through 42
5
612 43 through 48
Note:
If fractional T1 is used, the unused circuits still will occupy a line number.