Specifications

Dialogic

DSI SS7HD Network Interface Boards Programmer's Manual Issue 11

3.5 Received Message Timestamping

When used with the board and monitored links, this functionality can be used to

provide a timestamp of the time a message is received by the board, to a resolution of

1ms. Individual boards maintain time by synchronizing with the host time.

The following table provides details of the expected timestamp accuracy between

boards, in a multi board system:

Operating System

Measured Accuracy

Linux

1 ms

Solaris

1 ms

Windows®

5 ms

3.5.1 Host Configuration

The host must be configured to enable timestamping as follows:

1. Configure REDIRECTs on the host to pass messages down to the management

module on each of the signaling processors by adding the following lines to the

system.txt file on the host:

REDIRECT 0xce 0x20 * MGMT module_id for SP 0

REDIRECT 0xde 0x20 * MGMT module_id for SP 1

REDIRECT 0xee 0x20 * MGMT module_id for SP 2

REDIRECT 0xfe 0x20 * MGMT module_id for SP 3

2. Configure the LIU to operate in high-impedance mode using the <liu_type>

parameter in the LIU_CONFIG command, which has the following format:

LIU_CONFIG <brd_id> <liu_id> <liu_type> <line_code> <frame_format> <crc_mode>

For example, to configure E1 high-impedance mode, use the command:

LIU_CONFIG 0 0 6 1 1 1

3. Configure receive only monitoring links using the MONITOR_LINK command in the

config.txt file, which has the following format:

MONITOR_LINK <link_id> <board_id> <blink> <stream> <timeslot> <user_module>

Timestamping is disabled by default. To enable timestamping on the monitored link,

set bit 0 in the <flags> field to 1. For example: