2.51
ELNB-A
FIGURE 55 ELNB-A, DCB-A POSITION FOR A
EXCHANGE LINE
FIGURE 56 ELNB-A, DCB-A POSITION FOR AVF EXCHANGE LINE
There are two DCB-A plug-in daughter boards on this board. The DCB-A board must be
correctly plugged into the connector, according to the type of exchange line used.
Figure 55 shows the location for a decadic exchange line (keying location is pin
Figure 56
shows the location for a VF exchange line (keying location is pin
The ELNB-A board has
to indicate exchange line status LED1 for the first line, to LED4
for the fourth line. A steady LED indicates that the line is seized, a flashing LED indicates an
incoming call and a flickering LED indicates decadic dialling.
83
ISSUE 1