
NTD12 Dual-port DTI/PRI card description and installation Page 139 of 188
ISDN PRI Installation
DDP switch settings
The DDP card is equipped with 6x2 sets of DIP switches for trunk parameters
settings for port0 and port1 respectively. Additionally, the DDP card is
equipped with one set of four DIP switches for the Ring Ground setting and
one set of eight DIP switches for the D-Channel Handler parameters setting.
The DIP switches are used for setting of default values of certain parameters.
The general purpose switches are read by the firmware which sets the default
values accordingly.
The following parameters are being set by the DIP switches. Factory setups
are shown in bold.
General Purpose Switches
A per trunk set of four DIP switches provides the default setting for
operational modes. Switch set S9 is used for Trunk 0. Switch set S15 is used
for Trunk 1.
Table 34- General purpose switch settings
Switch
Description
S9/S15 Switch Setting
1
Framing Mode
OFF - ESF
ON - SF
2
Yellow Alarm Method
OFF - FDL
ON - Digit2
3
Zero Code Suppression
Mode
OFF - B8ZS
ON - AMI
4
Unused
OFF