Toshiba Strata AirLink DK40i, Installation And Maintenance Manual

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ISDN Interfaces
ISDN Disconnect Cause Code
Strata DK I&M 6/00
16-49
ISDN
Inte
rface
s
Explanation of the LCD Information
Figure 16-38 shows ISDN Call Termination Fields; information changes. Table 16-19 provides a
definition of these fields. Cause code values are further defined in tables later in this chapter.
Figure 16-38 Call Termination LCD Display
The above figure shows how the information on the display changes according to the status of the
terminal when the line is disconnected. The content of each type of information is as shown in
Table 16-19 .
♦ Call Reference Number – The number of the disconnected call displays in a field that is up to
four digits long. If the number is not four digits long, the numbers will start from the far left. In
case the call is disconnected before it is picked up, “NA (which stand for Not Available)”
displays on the left.
The highest bit of the call reference number indicates whether the call has been transmitted or
received. For example, if the DK disconnects the call and the call reference number is “0001,”
the call has been transmitted by the DK, and if the call reference number is “8001,” it means
that the call was received by the DK.
♦ Reason for call termination – The reason is provided by a series of ISDN disconnection
messages exchanged when the line is disconnected. The cause value within the information
element of cause included in these messages will be used.
C A L L T E R M I N A T E D
C R = 0 0 0 1 . . . C O = 1 0
Call Reference
Disconnect Direction:
"CO" means the Central Office disconnected the call.
"DK" means the DK system disconnected the call.
Disconnect Cause Code:
Provides the reason for call termination.
Refer to the Disconnect Cause Code
tables that follow in this section.
The last three digits or are the call reference number.
This number is incremented and generated by the DK
as each call is made or received.
The first digit of the call reference number indicates if it was an outgoing call
made by the DK or an incoming call received by the DK. This digit is usually
a "0" or "8" and is interpreted as follows:
4778
If the CO disconnected the call:
0 = the DK received the call (incoming)
8 = the DK made the call (outgoing)
If the DK disconnected the call:
0 = the DK made the call (outgoing)
8 = the DK received the call (incoming)