EFJohnson 3000 SERIES - Manual (Page 133)

TELEPHONE INTERFACE MODULE (TIM)
14-23
14.11 TERMSET MODULES
The Termset modules are used for converting a 2-
Wire, Loop Start (LS), Ground Start (GS) or Reverse
Burst (RB) circuit to a 4-Wire E&M for use with the
Switch 4-Wire E&M board.
14.11.1 EQUIPMENT SETUP
NOTE: Use Type V signaling on E&M for Tellabs
cards.
14.11.2 INITIALIZING THE TELLABS CARDS
Switch Settings on 6132B (POTS Applications),
see Table 14-9. POTS lines use the Tellabs 6132B
Termset. Initialize the Termset switch settings, see
Figure 14-22.
Figure 14-22 TELLABS 6132B - POTS
Table 14-9 TELLABS 6132B - POTS
Sw Purpose
S14 Initially set to NORM. If the E-Lead (Green LED)
stays on constantly, or the termset does not answer
in-dial, place S14 in REV position. This switch
reverses the battery polarity presented to the E&M
card from the CO in POTS applications. BYPASS
(and removal of B subassembly) will allow 6132 to
be used without signaling.
S5 Place in 2W. This switch determines the interface.
S4 To get started, set to 900, with all capacitors in. Set
to variable and adjust R38 when performing the
actual balance. This balance network allows 600,
900 or variable resistor (2k) resistive balance. Also,
5 capacitors ranging from .002
µ
F to .032
µ
F in
octaves (i.e. .064
µ
F total capacitance) provide for a
capacitive balance.
R38 This potentiometer controls the resistive balance in
the variable mode of S4.
S12 Supervisory Mode. Set to GS (Ground Start), LS
(Loop Start), RB (Reverse Battery) allows the term-
set to detect battery reversal from the CO (if it is pro-
vided) which indicates hang-up).
S19 Set to sig for Loop Start, inv for Ground Start appli-
cations. This switch provides for normal (sig) or
inverted (inv) E&M outputs.
S18 Set to sig. This switch provides for normal (sig) or
inverted (inv) E&M inputs.
S11 Set to B. This switch swaps roles of E-Lead and M-
Lead.
S3 Set to 600. This switch provides 2W port terminat-
ing impedance.
LS (LOOP START)
BOTTOM UP
INV (GROUND START)
SIG (LOOP START)
S19
SIG
S18
B
S11
600
S3
GS (GROUND START)
S12
TOP DOWN
R38
ALL CAPS ON
900
S4
2W
S5
NORM
S14