Nortel Meridian Meridian 1 Feature Description And Administration page 1131

ISDN Semi Permanent Connections for Australia Page 1131 of 1814
Master Side
The data interface, connected to the D-channel, must be configured in
autodialing mode. The dialing sequence configured on the MASTER SIDE,
rings the data interface on the SLAVE SIDE of the ISPC link through the
associated route of the Phantom TN. The Dial Tone Detection feature must
be configured for this route so that dial tone is provided by the SLAVE SIDE
of the ISPC link. The dial tone indicates to the MASTER SIDE that both legs
of the ISPC link have been successfully setup by the Central Office.
As illustrated in Figure 93, when the data interface initiates its dialing
sequence, a path is set between the interface and the ISPC link. If no dial tone
is detected, the path is released. Additional attempts are performed by the data
interface because it has been configured in autodialing mode. When the
dialing tone is successfully detected, the Directory Number associated to the
data interface used on the ISPC SLAVE SIDE, is dialed through the ISPC link
using Dual Tone Multi-Frequency (DTMF) tones.
Slave Side
The data interface connected to the SLAVE SIDE must be configured to
autoanswer mode. When an ISPC link is established, a path is made with a
TDS card to provide Dial Tone to the ISPC link, and DTMF digits are
expected. The DTMF digits identify the Directory Number where the data
interface that is to ring is connected. When the data interface on the SLAVE
SIDE is rung, it answers and initiates its own protocol sequence and
D-channels can be established.
After 30 minutes of unsuccessful attempts to connect, the path between the
ISPC link, the TDS card and the DTR cards is removed, provided that the
default mode is set to "MANUAL and 1 attempt". A technician can change
these default parameters in LD 96.
International ISDN PRI Feature description and administration