Northern UTA220/UTA220k - Manual (Page 91)

UTA220/UTA220k
12-15
D-Channel X.25
PAD Reset Service Signals
A reset service signal is transmitted to the local DTE when
resetting is initiated by the network or remote DTE. The reset
cause code issued with the reset request packet from the
network or local DTE indicates the reason. The reset cause
code is interpreted by the PAD and the resultant cause code
service signal extension is transmitted to the local DTE with
the RESET service signal. The following is a list of the possible
reset service signals that may be transmitted to the local DTE
by the PAD.
Pad Clear Service Signals
A clear service signal is transmitted to the local DTE when
clearing is initiated by the network or remote DTE. The clear
cause code issued with the clear request packet from the
network or local DTE indicates the reason for the clearing. The
clear cause code is interpreted by the PAD and the resultant
cause code service signal extension is transmitted to the local
DTE with the CLR service signal. Table 12-4 shows the clear
service signals that may be transmitted to the local DTE by the
PAD.
Table 12-3: PAD Reset Service Signals
Service
Signal
Reason
RESET DTE Reset by remote DTE
RESET
ERR
Reset due to a local procedure error
RESET NC Reset due to network congestion
RESET RPE Reset due to a remote DTE procedure
Table 12-4: PAD Clear Service Signals
Service
Signal
Reason
CLR OCC DTE is engaged in another call and cannot accept the incoming
call
CLR NC Network problem exists which prevents the network from
handling the call
CLR INV DTE requested an invalid facility
CLR NA DTE to DTE connection not allowed. For example, if the closed
user group was not the same the connection would not be allowed
CLR ERR Clearing error caused by the local DTE detected by the PAD