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9.7
UDP Heartbeat Packet
922-DSLH cards will continuously transmit a broadcast heartbeat User Datagram Packet (UDP) from the
microcontroller with diagnostics information after power-up. The card transmits this packet every five (5) seconds
by default. This interval can be adjusted to any value between 1 and 254 seconds through Telnet. The data is
printed out as comma separated text (ASCII) and a network capture utility (e.g. Wireshark) can be used to
capture this data. The UDP heartbeat can be used, for example, to identify cards in cases where the IP
information has been lost.
The 922-DSLH card can output the UDP heartbeat in two different packet lengths: short (normal) and extended.
The "short" packet contains the following diagnostics information:
Serial number, date code, assembly number and firmware version
MAC address, IP address, subnet, gateway, primary and secondary DNS
The "extended" packet includes all the information from the short packet plus the following diagnostics
information:
Card on time, number of off events, card temperature, card voltage, current draw
Link status of copper ports CU1 and CU2
The 922-DSLH cards output the "short" packet version by default. The table below shows an example of the
diagnostics information contained in each type of UDP heartbeat packet. The heartbeat packet type can be
changed through Telnet by sending the command "hcfg long" for extended packets or "hcfg short" for short
packets.
Table 9-1: Model 922 UDP Heartbeat Packet Content (From uC DIAG)
"Short" Packet (default)
Serial No
: 10054378********
Date Code
: 20170511********
Assembly No : 922-5016-00*****
FW VER
: A3
MAC ADDRESS : 00-09-CC-08-12-A7
LOCAL IP
: 192.168.0.100
Subnet
: 255.255.255.0
Gateway
: 192.168.0.1
Prim DNS
: 8.8.8.8
Sec DNS
: 8.8.4.4
9.8
Multiple Modbus Clients
922-DSLH cards provide support for up to four (4) Modbus clients. This feature allows the user to establish more
than one Modbus TCP/IP connection (up to 4) to the same card. When more than one connection is established
to the card, some packet collisions and re-transmission are expected. In general, when using multiple TCP
connections to the same card, it is recommended to set the Modbus poll rate to a value greater than 1 second.
Focal Technologies Corporation
A Moog Inc. Company
UDP Heartbeat Packet Example
Model 922 Dual DSL Carrier Card Information
Serial No
Date Code
Assembly No : 922-5016-00*****
FW VER
MAC ADDRESS : 00-09-CC-08-12-A7
LOCAL IP
Subnet
Gateway
Prim DNS
Sec DNS
ON Time
Number of OFF Events
Board Temperature(degC) : 0.00
+5V Supply
Board Current(A)
CU 1 Link : Linked
CU 2 Link : Not Linked
Model 922-DSLH – User Manual
"Extended" Packet
: 10054378********
: 20170511********
: A3
: 192.168.0.100
: 255.255.255.0
: 192.168.0.1
: 8.8.8.8
: 8.8.4.4
: 24 Days 0 Hours
: 247
: 4.942
: 0.27
Document No. 922-0677-00, Rev 1.0
Page 9-3
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