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Voice Cards 11-3
E&M Card E&M Card Descriptions
Table 11-1. Typical E&M Card Switch Definitions
Table 11-2. Typical E&M Card Switch Settings
*Indicates that the port is attached to a device that generates signaling, such as a PBX.
**Indicates that the port is attached to a device that does not generate signaling, such as a
channel bank. In this case, the integrated access system emulates a PBX and generates
signaling. This configuration is also known as a Tandem E&M or Pulse Link Repeater (PLR)
application.
Switch Definition
S1 Source of the E (recEive or Earth) lead; can be internal (INT) or external
(EXT).
S2 Type of internal source for the E lead; either battery (-48 VDC) or ground
(GND).
S3 Type of internal source for the M (transMit or Magnetic) lead; either battery
(-48 VDC) or ground (GND).
S4 Normal state of the E lead; either grounded (ON) or open (OFF). Each card
port number is designated on the eight-position DIP switch. All eight switches
must be set to the same position (all ON or all OFF).
E&M Type Direction S1 S2 S3 S4 (all switches)
I Normal E&M* INT GND GND OFF
Trunk** INT BAT BAT ON
II Normal E&M* EXT BAT GND OFF
Trunk** EXT GND BAT OFF
IV Normal E&M* EXT GND BAT OFF
Trunk** EXT GND BAT OFF
V Normal E&M* INT GND BAT OFF
Trunk** INT GND BAT OFF
Factory Settings (default) INT GND GND OFF