Nortel Enterprise 1000 Reference Manual page 127

Table 27
E&M trunk card – jumper strap settings
Jumper
(Note 1)
Type I
J1.X
J2.X
J3.X
J4.X
J5.X
J6.X
J7.X
J8.X
J9.X Pins 2–3
Note 1: Jumper strap settings J1.X through J9.X apply to all four units; "X" indicates the unit number, 0–3.
Note 2: "Off" indicates that no jumper strap is installed on a jumper block.
Note 3: Paging trunk mode is not zone selectable.
Note 4: Jumper strap installed in this location only if external loop resistance is greater than 2500 ohms.
Succession Communication Server for Enterprise 1000 Circuit Card Reference Guide
2-wire trunk
Paging
Off Off
On On
(Note 3)
Off Off
Off Off
Off Off
Off Off
Off Off
Off Off
Pins 2–3
NT8D15 E&M Trunk Card
Mode of operation (Note 2)
Type I Type II
Off Off
On On
Off Off
Off Off
Off Off
Off Off
Off Off
Off Off
Pins 2–3 Pins 2–3
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4-wire trunk
DX tip & ring pair
M—rcv
E—xmt
Pins 1–2
Off
(Note 4)
Pins 2–3
(Note 4)
On
On
On
Pins 1–2
E—rcv
M—xmt
Pins 2–3
Off
(Note 4)
Pins 1–2
(Note 4)
On
On
On
Pins 1–2