Creating Logical Pools for a Digital Off-Hook Configuration

This chapter explains the concept of logical and physical pools and includes guidelines, illustrations, and instructions for creating logical pools for a Digital Off-Hook (DOH) configuration. This chapter is oriented from the viewpoint of the operator who is using the ViewRunner graphical user interface (GUI) to set up new subscribers or to change the settings for existing subscribers.

This chapter includes the following sections:

Note See the overview chapter in the ViewRunner for Windows User Guide for a review of how to navigate on the GUI.

Overview and Purpose

A logical pool is a logical grouping of modems and lines. This grouping achieves a particular concentration of subscriber lines to CAP ATU-C modules, such as, 1:1, 2:1, or 6:1. You can define up to three logical pools per physical pool. The Cisco 6100/6130 is divided into two physical pools, A and B. Physical pool A consists of every component in the top half of the chassis; physical pool B consists of the bottom half of the chassis. Once you have partitioned a chassis into physical pools A and B, you cannot change it.

Figure 2-1 shows an example of how the physical pools in the Cisco 6100/6130 are partitioned.

Figure 2-1: Cisco 6100/6130 Physical Pools

Figure 2-2 illustrates the physical pools for the line concentration chassis.

Figure 2-2: Line Concentration Chassis Physical Pools

Figure 2-3 illustrates the physical pools for the Cisco 6120.

Figure 2-3: Cisco 6120 Physical Pools

Guidelines for Creating Logical Pools

Consider the following guidelines before you set up logical subscriber pools:

Each line concentration chassis and Cisco 6120 is also divided into physical pools.

Physical pool A is the left half of the chassis.

Physical pool B is the right half of the chassis. (See Figure 2-1 and Figure 2-3.)
You can define up to three logical pools per physical pool.
Logical pools are constrained to physical pools; that is, a logical pool can contain lines and modems only from modules that are plugged into a specific physical pool. (See Figure 2-2)
After you add a module to the Cisco 6100 Series system, you must manually configure each line to be a member of a logical pool. Each port (either LIM or dual-port CAP ATU-C) can be a member of only one pool at a time.
Only LIM and CAP ATU-C ports within a physical pool are candidates for assignment to a logical pool that belongs to that physical pool.
Logical pools are relevant only in DOH configurations, not in Direct Connect configurations.
You must lock CAP ATU-C module ports before you can assign or remove them from a logical pool.
You must lock LIM ports before you can assign or remove them from a logical pool.
You must associate each line port to an unlocked subscriber.
The Pool Properties dialog box includes a set of Physical Pool tabs. On each Physical Pool tab, a second set of tabs shows the logical pools that are configured for the corresponding physical pool. Logical Pool tabs include Logical Pool 1 up to Logical Pool 3.
Once you choose a logical pool, the Pool Properties dialog box Logical Pool tab displays the current configuration of the logical pool.
Each logical pool can contain zero or more LIM ports and zero or more CAP ATU-C ports. You assign lines and modems to pools for each port, not for each module.
Running totals, or summaries, of pool assignments on the Pool Properties dialog box Logical Pool tabs describe the characteristics of the ports and subscribers that are assigned to the pools.
The Over Subscription Ratios field at the top of the Pool Properties dialog box Logical Pool tab changes dynamically, according to the number of LIM ports and CAP ATU-C module ports you add to the top list boxes.

: For more information on physical and logical pools, see the Cisco 6100 with NI-1 Digital Off-Hook Installation Guide.

Using the Pool Properties Dialog Box

To create logical pools from physical pools, you use the Pool Properties dialog box Logical Pool tabs. The Pool Properties dialog box includes two sets of tabs that represent the physical and logical pools. The highest level of tabs allows you to choose either Physical Pool A or B. Figure 2-4 shows a Pool Properties dialog box that reflects no pools assigned.

Figure 2-4: Pool Properties Dialog Box---Logical Pool Tabs, No Pools Assigned

As you add logical pools, the Logical Pool tabs appear on the Pool Properties dialog box, as shown in Figure 2-5.

Figure 2-5: Pool Properties Dialog Box---Logical Pool 3 Tab

The Pool Properties dialog box displays a variety of statistics that describe the configuration of the logical and physical pools. Table 2-1 describes the fields on the Physical Pool and Logical Pool dialog box.

Table 2-1: Pool Properties Dialog Box Fields

Field Description

Add Pool Now button

Use to provision up to three logical pools per physical pool. Logical Pool tabs display in the order in which you create them. Therefore, if Logical Pools 1, 2, and 3 exist and 2 is deleted, then Logical Pool 3 becomes Logical Pool 2.

Delete Pool Now button

Click to delete a logical pool after you deassign any ports that are currently assigned to the selected logical pool.

Note ViewRunner requires all assigned LIM ports to be locked before you can delete a pool. The Delete Pool Now button is dimmed unless all assigned LIM ports are locked.

Over Subscription Ratios (OSRs)

Displays the running total of oversubscription within the currently selected logical pool. ViewRunner displays three different oversubscription formulas. These three ratios are described in Table 2-2.

Real-time Display of DOH Service Statistics

Displays running totals of several counts and calculated values. ViewRunner displays the following statistics when you choose the logical pool tab:

The number of line or CAP ATU-C ports that are assigned within the currently selected logical pool.

The number of line or CAP ATU-C ports that are unassigned to any logical pool.

The number of provisioned unlocked ports. This is the number of ports within each list box that have the necessary Administrative state configuration to provide service.

A properly configured port must be unlocked and subordinate to an unlocked module.

Line ports have the additional requirement that each one must be associated to an unlocked subscriber.

The number of provisioned and in-service ports. The number of ports that have a Service state of In Service and are associated to an unlocked subscriber.

ViewRunner updates running totals whenever you delete a logical pool, or when you assign or unassign a port to or from a logical pool.

These statistics give a summary view of many critical service parameters for the Cisco 6100 Series system. For large system configurations, most of the list boxes on this dialog box are filled and have scroll bars. These totals provide a convenient summary and replace scrolling the list box and manually tallying DOH service parameters.

Table 2-2: Oversubscription Ratio Descriptions

OSR Description

Assigned Port

Reflects the number of line ports that are assigned to the logical pool divided by the number of ATU-C ports that are assigned to the logical pool.

This ratio is useful when you are initially configuring logical pools. The Assigned Port ratio is based on locked entities and displays the target oversubscription provisioning ratio for the pool.

Provisioned and Unlocked

Reflects the number of unlocked line ports that are

Assigned to the logical pool

Subordinate to an unlocked module

Associated with an unlocked subscriber

This number is divided by the number of unlocked ATU-C ports assigned to the logical pool that are subordinate to an unlocked module. Locking ATU-C ports increases this OSR (for example, 3:1 goes to 6:1). Locking LIMs reduces this OSR (for example, 6:1 goes to 3:1).

This ratio is useful if you want to verify whether the system is configured properly and that the entities are unlocked to support the target OSR. This ratio is equal to the assigned port OSR when you have completed all provisioning tasks that are needed to support service and have unlocked the entities.

Provisioned and In-Service

Reflects the number of in-service line ports assigned to the logical pool that are also associated with an unlocked subscriber. This number is divided by the number of in-service CAP ATU-C ports assigned to the logical pool.

This ratio displays the active OSR that the system is experiencing. Required configurations, administrative permissions, and the service state of the pooled ports are factored into this ratio. Provisioned and In-Service OSR includes the Operational state of the system and changes as alarms set or clear.

OSR	Description
Assigned Port	Reflects the number of line ports that are assigned to the logical pool divided by the number of ATU-C ports that are assigned to the logical pool. This ratio is useful when you are initially configuring logical pools. The Assigned Port ratio is based on locked entities and displays the target oversubscription provisioning ratio for the pool.
Provisioned and Unlocked	Reflects the number of unlocked line ports that are Assigned to the logical pool Subordinate to an unlocked module Associated with an unlocked subscriber This number is divided by the number of unlocked ATU-C ports assigned to the logical pool that are subordinate to an unlocked module. Locking ATU-C ports increases this OSR (for example, 3:1 goes to 6:1). Locking LIMs reduces this OSR (for example, 6:1 goes to 3:1). This ratio is useful if you want to verify whether the system is configured properly and that the entities are unlocked to support the target OSR. This ratio is equal to the assigned port OSR when you have completed all provisioning tasks that are needed to support service and have unlocked the entities.
Provisioned and In-Service	Reflects the number of in-service line ports assigned to the logical pool that are also associated with an unlocked subscriber. This number is divided by the number of in-service CAP ATU-C ports assigned to the logical pool. This ratio displays the active OSR that the system is experiencing. Required configurations, administrative permissions, and the service state of the pooled ports are factored into this ratio. Provisioned and In-Service OSR includes the Operational state of the system and changes as alarms set or clear.

Steps for Creating Logical Pools

Complete the following steps to create a logical pool:

Step 1 Create populated physical pools by inserting modules into the upper and lower parts of the Cisco 6100/6130 chassis.

Step 2 Right-click the chassis rim to access the Chassis menu.

Step 3 Choose Pool Properties to open the Pool Properties dialog box (refer to Figure 2-5).

Step 4 Click the Logical Pool tab.

The Pool Properties dialog box opens to the Physical Pool and Logical Pool tabs.

Step 5 Click Add Pool Now on the Pool Properties dialog box.

A new Logical Pool tab appears (Figure 2-6).

Figure 2-6: Pool Properties Dialog Box---Logical Pool 3 Tab

Figure 2-6 shows that ViewRunner has added Logical Pool 3. On the Logical Pool 3 tab, the OSR field displays Assigned, but not Provisioned.

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