EDAC Installation Guide
512-1090-001, Revision K0
Page 19 of 56
Digital Input
The digital input of each port on the EDAC attaches in parallel to one digital telephone
port. The unit may be attached to the digital telephone port anywhere along the loop
between the switch and the telephone set. The distance between the line connection
and the EDAC unit (tap length) should be no more than 30 feet (9 meters). There should
be no line stubs (loose, non-terminated cables). Loop length limits range from 1,000 feet
(305 meters) to 2,500 feet (762 meters) depending on the system. Refer to Cabling
section on page 37 for more detail.
The EDAC interface adds very minimal loading of the digital telephone line and will not
affect normal telephone operation. The EDAC digital input is cross-connected in parallel
with the
telephone’s digital signaling pair.
Analog Output
The analog output of each port on the EDAC is cross-connected to the analog input of
standard
600 ohm recording or monitoring equipment. The EDAC’s analog output is a
600 ohm pair with a nominal level of -12dBm. Both ends of the conversation are
included in the analog output.
The distance between the EDAC’s analog output and the recording equipment may
depend on the minimum input level required by the recorder. Typical recording
equipment should operate at a distance of up to 2,500 feet (762 meters) from the EDAC
with 24 AWG cable. It is recommended that the analog loop be as short as possible to
reduce the possibility of noise from nearby electrical equipment that may cause
interference in the recorded audio.
EDAC Single Port Cards
Single port cards, shown in Figure 5, mount into the SIMM sockets, labeled JP1, JP2 ...,
JP12, on the base board (see Figures 6 and 7 for more detail). Each port card services
one port on the PBX or KSU. These cards provide the main functionality for the EDAC.
Prior to installation or removal of cards, ensure that the unit power cord is disconnected.
Figure 5. EDAC Single Port Card
