3.7 NETWORK MANAGEMENT
3.7.1 OVERVIEW
The overall performance of the network can be degraded if there are too many call attempts in a telephone network.
Network management provides real-time surveillance and control techniques to minimize the network degradation.
3.7.2 TRUNK GROUP CONTROLS
One of the management capabilities is the automatic or manual trunk group controls. Trunk group controls are used
to limit the access of calls to a trunk group, to control the overflow of calls from a trunk group, and to offer alternate
routing chains to busy groups. The control methods used are either protective or expansive. Protective controls are
used to control the spread of congestion in the network by restricting normal trunk access and overflow. Expansive
controls allow the routing to expand beyond the normal in-chain routing during failure or overflow conditions.
Trunk group controls can be divided into two classes:
Prehunt:
Applied after a trunk group has been chosen and before the hunt for an idle member starts.
Posthunt:
Applied after the trunk group hunt failed to locate an idle member and before alternate route
treatment is applied.
The controls will be active when a threshold is reached. The threshold for prehunt controls is the percentage of all
calls attempting to select a member in a trunk group. The percentage of all calls failing to select a member in a trunk
group is the threshold for posthunt controls. There are four trunk group controls: cancel-to, cancel-from, skip, and
reroute.
The cancel-to control is a prehunt control which cancels traffic destined for a specific trunk group. The call is then
routed to one of the following announcements:
NCA:
No Circuit Announcement
EA1:
Emergency Announcement 1
EA2:
Emergency Announcement 2.
The cancel-from control is a posthunt control which cancels calls failing to select a member in a trunk group. In this
case, the call is routed also to one of the previously mentioned announcements.
The skip control is a prehunt control which skips the selected trunk group and provides an alternate route. When no
alternate routes are available, the call will get the treatment defined for such a call.
The reroute control is a posthunt control which provides a different routing chain to allow traffic to be routed over
these secondary groups when the primary is congested. When no member has been found in the secondary groups,
the call will be routed again by the primary groups. When a cancel in-chain return (CICR) is specified, the call will be
routed to the no circuit announcement (NCA).
3.7.3 INPUT MESSAGES AND RESPONSES
When a manual trunk group control change occurs, an autonomous response is generated. There are two kinds of
changes: either all of the manual controls have been deleted or a single manual trunk group control has changed.
Manual trunk group control reports can be affected by means of input messages. The reports can be either allowed
or inhibited. Printing a report on the ROP can be stopped by an
STP:NMOP?
input message.
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October 1999
Copyright © 1999
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Страница 516: ...Figure 10 24 1 KS 23483 L13 Disk Drive Cable Connection Rear View 235 105 210 October 1999 Copyright 1999 Page 2 ...
Страница 517: ...Figure 10 24 2 KS 23483 L21 Disk Drive Cable Connection Rear View 235 105 210 October 1999 Copyright 1999 Page 3 ...
Страница 518: ...Figure 10 24 3 KS 23841 L15 Disk Drive Cable Connection Rear View 235 105 210 October 1999 Copyright 1999 Page 4 ...
Страница 523: ...Figure 10 24 6 Top View of DUP Showing Internal Cabling 235 105 210 October 1999 Copyright 1999 Page 9 ...
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Страница 799: ...Figure 11 36 3 1 Cleaning Points 235 105 210 October 1999 Copyright 1999 Page 7 ...
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Страница 1008: ...Figure 11 55 1 CTSNS DIP Switch Settings 235 105 210 October 1999 Copyright 1999 Page 2 ...
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Страница 1165: ...Procedure 14 14 RESERVED FOR FUTURE USE PROCEDURE 1 Reserved For future use 235 105 210 October 1999 Copyright 1999 Page 1 ...
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Страница 1187: ...Procedure 14 18 RESERVED FOR FUTURE USE PROCEDURE 1 Reserved For future use 235 105 210 October 1999 Copyright 1999 Page 1 ...
Страница 1284: ...Figure 15 15 1 PARADYNE Paradyne Corporation 3810 Modem Diagnostic Control Panel 235 105 210 October 1999 Copyright 1999 Page 6 ...
Страница 1287: ...Figure 15 16 1 153A Adapter Connection Figure 15 16 2 AMATPS Block Diagram 235 105 210 October 1999 Copyright 1999 Page 3 ...
Страница 1289: ...Figure 15 17 2 AMATPS Data Link 235 105 210 October 1999 Copyright 1999 Page 2 ...
Страница 1290: ...Figure 15 17 3 Single Housing B25A Cable Assembly 235 105 210 October 1999 Copyright 1999 Page 3 ...
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Страница 1342: ...Figure 15 40 1 SCANS II Dial Up Data Set Installation Diagram 235 105 210 October 1999 Copyright 1999 Page 2 ...
Страница 1344: ...Figure 15 40 4 59A1 Mounting Front in Slot J3 Figure 15 40 5 2048A Data Set Front 235 105 210 October 1999 Copyright 1999 Page 4 ...
Страница 1345: ...Figure 15 40 6 Berg Connector Terminations and Layout 235 105 210 October 1999 Copyright 1999 Page 5 ...
Страница 1346: ...Figure 15 40 7 B25A Cable 4 STOP YOU HAVE COMPLETED THIS PROCEDURE 235 105 210 October 1999 Copyright 1999 Page 6 ...
Страница 1360: ...Figure 15 47 2 Typical SCANS III Link Diagram 235 105 210 October 1999 Copyright 1999 Page 2 ...
Страница 1368: ...Response FA or OK appears 17 STOP YOU HAVE COMPLETED THIS PROCEDURE 235 105 210 October 1999 Copyright 1999 Page 2 ...
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Страница 1376: ...Figure 15 55 6 201C to TN83 Data Set Cable Drawing 235 105 210 October 1999 Copyright 1999 Page 6 ...
Страница 1418: ...Figure 15 56 1 PARADYNE 3810 Modem Diagnostic Control Panel 235 105 210 October 1999 Copyright 1999 Page 4 ...
Страница 1421: ...Table 1 1 O M Checklist 235 105 210 October 1999 Copyright 1999 Page 3 ...