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This chapter describes the procedure to configure signal paths.
You create a signal path for each linkset (up to 16 links). (See "Traffic Paths.") One signal path can control multiple traffic paths. You set up linksets in your signal path.
The Signal Path tab contains two boxes at the top where you can select a TransPath component and signal path from drop-down menus and a bottom part containing subtabs for general information, channels, and properties. (See Figure 14-1.)
At the upper right side you have a drop-down list of the TransPath components. If you want to work in another TransPath component, you can select it here. You do not have to return to the Sites tab to select a different TransPath component.
The General subtab is highlighted and displays a prompt to select a signal path from the drop-down list or add one. (See Figure 14-1.) Here you can add, modify, and delete signal paths.
When you select a signal path from the drop-down list, a dialog box displays the relevant information for that path. You must add a destination from the traffic path list. A drop-down list of appropriate traffic paths is displayed. You must select a traffic path with an embedded access device to associate with the signal path. All signal paths must be associated with a traffic path. (See Figure 14-2.)
When you right-click while you are in a dialog box in the General subtab, a menu appears with two choices:
The only way you can delete a signal path is from this window while you have a signal path dialog box open.
One of your options is to go to the drop-down list and add a signal path. When you select this option, a dialog box similar to the Traffic Paths General dialog box appears and you use the Tab key to move from box to box to make selections or manually enter information.
When you add a signal path, you will see a system-assigned sequence number, unspecified protocol choices, a blank description (optional), and a blank path number. Buttons for OK and Cancel also appear. You cannot change to other tabs or subtabs until you click on OK or Cancel.
If an SS7 protocol is chosen, the CIC and point code fields also appear. There are no defaults for point codes. The starting CIC code defaults to 100.
The following steps provide an example for configuring a signal path.
Step 1 Select the protocol family from the drop-down list.
Step 2 Select the variant from the drop-down list.
Step 3 Click on the Access radio button.
Step 4 The description is optional; an example of a description for an SS7-ANSI protocol signal path is SS7 Line.
Step 5 Enter n in the SigPath tag number field (where n is the number of your signal path; 1 if this is the first one, 2 for the second, etc.).
Step 6 Enter the telephony controller's point code in the Own Point Code (OPC) field.
Step 7 Enter the point code of the intermediate network element in the SS7 network (usually the STP) or the DPC if there is no STP in the Adjacent Point Code field.
Step 8 Confirm that Load Sharing is set to N and Priority is 1.
Step 9 Click on the appropriate traffic path in the Traffic Path box (for example, SS&-In:1) and click on the Add Dest. button to add the traffic path to this signal path.
Step 10 Click on OK.
Step 11 Click on the Channels subtab. (See Channels Subtab.)
In the General subtab for an existing signal path, you can modify the description and path number, and (for SS7) the CIC and point code data. You cannot change the usage or protocol for an existing signal path.
To change the description, signal path number, starting CIC code, or OPC, type a new value in the field. Buttons are available for adding, changing, and deleting point codes. When you choose Add or Change, a small dialog box appears at the lower right where you can enter or modify the point code.
When the signal path is modified, OK and Cancel buttons appear; you cannot change tabs or subtabs until you click on OK or Cancel.
The Channels subtab shows the channels associated with the signal path. This includes bearer and signal channels. For a signal path with the usage access device, only external lines are displayed. Presentation details vary somewhat with the choice of protocol and usage.
By default, the ports, lines, and channels listed in the channel subtab are only the ones actually associated with the signal path. To facilitate adding channels to a subtab, right-click in it and choose Show Nonmembers from the popup menu. This will show all mapped ports, lines, and channels. In the case of signal channels, it will only include those that are associated with the current TransPath component. They are color-coded as follows:
When you right-click in the subtab, the popup menu shown in Figure 14-3 appears.
Only the available choices are active.
You complete the configuration of your signal path in this subtab.
Step 12 Select the first line (for example, NAS1-01) and navigate to the first channel (for example, D1).
Step 13 Right-click on channel D1 and select Add to Link Set.
Step 14 Enter 1 in the Priority field and leave the Linkset ID as 0 in the dialog box.
Step 15 Click on OK.
Step 16 Add channel D2 to the signal path with a priority of 1 and a linkset ID of 1.
Step 17 Continue until all channels have been configured, then click on Save.
If you have the Dial Plan Provisioning (DPP) application for number manipulation, under the Properties overrides section you must override the default settings (both 0) for the subscriber side link set to BOrigStartIndex = 1 and BTermStartIndex = 2 to integrate the DPP with the current Cisco Software Release 4 telephony controller configuration tool configuration.
The process of adding a signal channel varies with the protocol family. You set the signal path channel by selecting it from the line/channel tree (with non-members shown) and choosing Set Signal from the popup menu. Once it is set, it is displayed at the bottom center of the Channels subtab. Unset it by choosing Unset Signal Channel.
A PRI signal path has a primary signal channel plus an optional backup signal channel.
In the SS7or C7 protocol, a signal path may have multiple signal channels. Individual signal channels can be removed by selecting them in the line/channel tree, right-clicking on them, and choosing Remove From Link Set from the popup menu. The whole link set can be cleared by choosing Clear Link Set from the same menu.
The bearer channels grouped with a signal channel may be in the same line as the signal channel, in other lines, or both. The following rules apply:
These rules are not enforced by the Cisco Software Release 4 telephony controller configuration tool.
You can select lines rather than channels in the trees; the effect is as if you had selected all of the channels in those lines.
To add a bearer channel to the signal path, select it in the tree, right-click on it, and choose Add Bearer Channel from the popup menu. The dialog box shows the current link set members and the selected signal channel. For an external-usage line, only the selected line/channel is shown.
You can modify link set details for a link set member by selecting it and choosing Modify Link Set Details from the menu. The same dialog appears. You can change the link code and priority, and click on OK when done.
You can remove individual signal channels by selecting them in the line/channel tree and choosing Remove From Link Set. Clear the whole link set by choosing Clear Link Set from the menu.
A non-C7/SS7 subscriber signal path (and all subscriber signal paths are non-SS7), controls a set of bearer channels (a traffic path) from one or more subscriber ports and contains a single signal channel from some subscriber port, mapped to some signal channel of some TransPath port.
If the protocol family is PRI, there is also an optional backup signal channel from some subscriber port, likewise mapped to some signal channel of a TransPath port. These signal channels are listed at the bottom center of the display.
The Channels tab in this case shows the subscriber and TransPath ports as port-and-channel trees. The Subscriber tree shows bearer channels controlled by and signal channels included in the signal path. In this tree, all the bearer channels in a given subscriber line are grouped into a single non-expandable node.
For a non-C7/SS7 network signal path, there is a set of bearer channels from one or more network ports and a single signal channel from some network port, mapped to some signal channel of some TransPath port. If the protocol family is PRI, there is also an optional backup signal channel from some network port, likewise mapped to some signal channel of a TransPath port.
The Signal Path Properties subtab shows properties for an SS7 signal path. (See Figure 14-4.)
Properties are for viewing only. You do not have access to change them.
Each bearer channel in an SS7 signal path has a CIC code. Assign a range of CIC codes to all the bearer channels in an SS7 signal path from the General subtab. Set a value in the Starting CIC Code field. The bearer channels are then numbered sequentially (based on their order in a TransPath component). If you choose Show CIC Codes from the menu, bearer channels are displayed with their CIC codes.
Posted: Fri Nov 12 16:25:45 PST 1999
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