INSTALLATION
E-Lead Signaling
State
Table 2-4 describes how the E-Lead signaling is conditioned on loss of
power in the TMS-3000 controller.
TABLE 2-4. OPTION SELECTIONS, E-LEAD SIGNALING STATE
Jumper
Jumper
X5
X6
Feature
Position
Position
Application
Loss of Power
E-Lead Signaling State
Busy (
BSY)
Busy (
BSY)
With these two jumpers set in the position shown, the
E-Lead (pin 24 on the DB-25 EIA connector) is in a
Busy state during loss of power. This selection is
generally made for connections between the voice
channel and PBX systems, or Tellabs and other voice
termination systems (Not in PLAR applications, see
Note below).
Idle (
IDL)
Idle (
IDL)
With these two jumpers set in the position shown, the
E-Lead (pin 24 on the DB-25 EIA connector) is in an
Idle state during loss of power. This selection is gen-
erally made for connections between the voice chan-
nel and automatic ringdown circuits.
Idle
Busy
Invalid. Do not use.
Busy
Idle
Invalid. Do not use.
Note: Busy should not be used in private line automatic ringdown applications, as a loss of power will cause the phones at both
ends to ring until power is restored.
E-Lead Polarity
Table 2-5 describes the procedure for setting the E-Lead Polarity in rela-
tion to Station Ground.
TABLE 2-5. OPTION SELECTIONS, E-LEAD POLARITY
Jumper
Jumper
X7
X8
Feature
Position
Position
Application
Electrical Polarity of E-
–
–
E-Lead is negative.
lead relative to Station
+
+
E-lead is positive.
Ground
+
–
Invalid. Do not use.
–
+
Invalid. Do not use.
2-6
