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Configuration Parameters
2.4.1 TRUNK TYPE: The AM8a can be configured to interface with the types indicated by the
alternates shown in the menu. The types may be either direct analog or a voice channel
selected from a PCM link.
loop: This is the simplest type of interface. The terminal seizes a line by closing the
loop. If analog has been selected (see 2.2.2) the equipment is connected to the LOOP
T/R jack on the front panel. If PCM has been selected, the conditions are internally
emulated/monitored on a selected voice CHANnel.
ground: In ground start, the terminal seizes a line by grounding the tip lead. If analog
has been selected (see 2.2.2), the equipment is also connected to the LOOP T/R jack on
the front panel. If PCM has been selected, the conditions are internally
emulated/monitored on a selected voice CHANnel.
E & M 2W and E & M 4W: Refer to 2.4.3 for more information.
DID: This configuration is the same as LOOP except the switch initiates the seize and
dialing signals.
SF: This is a four-wire (TX and RX) configuration in which signaling and dialing is by
pulsed 2600 Hz tones.
2.4.2 SLC®TYPE: This selection is only active when FRAMING of SLC®96 I or SLC®96 II has
been selected (see 2.3.2) and is only for monitor mode.
SINGLE PARTY: must be used with TRUNK TYPE loop.
UNIVERSAL VOICE GRADE: can be loop or ground start.
2.4.3 E & M TYPE: This selection is only active when TRUNK TYPE of E & M 2W or E & M 4W
have been selected. The table below summarizes the connections that must be made to
the equipment for the TYPE parameters selected if in analog mode. For PCM modes,
the signaling bits will convey information:
E & M TRUNK INPUT
Jack Signals
E
M
SB signal battery
SG signal ground
TX
RX
February 10, 2000
(18-0037)
E & M TYPE
I
II
x
x
te/line orig.
x
x
switch orig.
-
x
-
x
TRUNK TYPE
E & M 2W and 4W
E & M 4W
2-6
AM8a Instruction Manual
III
IV
V
x
x
x
x
x
x
x
-
x
x
-
x
0037-S02.L_
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