3-107
FAX-L260i Chapter 3: Maintenance & Service
•How to View the Dch dump list
a) Title Column
*1
: Date and Time.
*2
: Elapsed time since the power was turned ON (msec.). Increases every 5 msec..
*3
: Message direction.
TX>
: The message the machine sent
<RX
: The message the network sent
*4
: Message Name. “(
L2
)” shows that the message is a Layer 2 message.
*5
: Message’s parameter. Displayed as hexadecimal numbers, 2 numbers of one octet each.
b) D-channel Layer 2 Messages
The D-channel Layer 2 message (SABME, UA, etc.) is not shown in the Dch dump list. It shows messages
processed inside the machine.
•EST REQ
: Machine sends SABME message
•EST CNF
: The UA message is received from the network pertaining to the SABME message which was
sent by the machine
•EST IND
: The UA message is sent from the machine pertaining to the SABME message received by the
network
•REL REQ
: Machine sends a DISC message
•REL CNF
: The UA message is received from the network pertaining to the DISC message sent by the
machine
•REL IND
: The UA message is sent from the machine pertaining to the DISC message received from the
network. Additionally, depending on the cause for the removal of ISDN line, even when
Layer 2 has been disconnected, the main message is still shown.
c) D-channel Layer 3 Message and Information Element
Normally, 4-octets of header information are attached to a D-channel Layer 3 message. (
*6
)
The length of the header information varies according to the value of the 2nd octet. For
example, when the value of the 2nd octet is “00,” the header information length is 3 octets, and when then
value of the 2nd octet is “01,” the header information length is 4 octets. The information elements will be
displayed following the header information. (
*7
)
There are 2 types of information element: single octet information element and variable length information
element.
c-1) Single Octet Information Elements
The Sending Complete information element which is included in the SETUP message can be used by this
machine. The
service data #4B ISDN BASIC Bitswitch SW06 bit0
is set to “1,” and when there is an
outgoing call, on the Dch dump list right after the header information in the SETUP message sent by this
machine, the main information is shown, and “
A1
” is set.
Summary of Contents for Fax-L260i
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