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This chapter describes how to configure GR-303 and includes the following sections:
GR-303 is a standard interface for integrated digital loop carrier systems. The Cisco 6700 Series of network elements uses GR-303 to handle call processing and operations when connected to a Class 5 switch.
The Cisco 6732 supports up to four GR-303 interface groups. Each interface group consists of at least two DS1 lines from the Cisco 6732 to the class 5 switch. The primary DS1 line carries the embedded operations channel (EOC) and timeslot management channel (TMC), while the secondary DS1 line offers protection in case of loss of service on the primary DS1 line.
Each interface group can contain a maximum of 28 DS1 lines. You can combine DS1 lines from multiple line cards for a single interface group.
GR-303 uses dynamic cross connects for concentration of DS0 channels, allowing one DS1 to serve more than 24 subscribers. GR-303 assigns call reference values (CRV) to analog lines. CRVs are used to build translation tables on the Class 5 switch that map remote analog connections to internal circuits at the switch. A single interface group can support up to 2,016 CRVs.
Local CRVs are assigned for analog circuits directly connected to the GR-303 processing node (the Cisco 6732). Lines used for local CRVs are assigned an interface group and CRV numbers. The EOC places the analog lines in service when needed. Local CRV provisioning allows the switch to decide if the line is ground start or loop start.
External CRVs are assigned to separate DS0s on the DS1s located in the Cisco 6732. The DS1/0s that are assigned CRVs are not the same ones that connect to the IDT. The CRV DS1/0s physically connect to DS1/0s in an external node. In the external nodes, the DS1s are cross connected to analog lines that correlate to the assigned CRVs. External CRV provisioning allows the switch to decide if the line is in ground start or loop start mode.
Remote CRVs are assigned to analog circuits connected to a remote node, such as a Cisco 6705 or Cisco IAD1101. The CRVs are assigned through an inter node data link from the Cisco 6732 to the remote node. For more information about inter node data links, see "Inter Node Links."
After a CRV is assigned to a line, the EOC puts that line in service when it is needed. If you provision the line in service, there are conflicts between the Cisco 6732 database and the switch database.
Provisioning GR-303 on the network requires the following steps:
To allocate call reference values (CRVs) for a GR-303 interface group, perform the following steps starting in node view:
Step 2 Set the following GR-303 parameters:
Step 3 Click Apply to provision CRVs for the interface group. Repeat Step 2 to provision additional interface groups.
You can provision DS1 lines for GR-303 on the following line cards:
At least two DS1 lines (primary and secondary) must be provisioned for each interface group.
To provision DS1 lines on a DSX1/8 line card, perform the following steps starting in node view:
Step 2 In the line provisioning window, set the following parameters:
Step 3 Click Apply to provision the DS1 line.
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Note To reassign an incorrect interface group ID or member ID, first set the ID to 0 and click Apply, then select the correct ID number and click Apply. |
Step 4 Repeat this procedure until all DS1 lines are assigned to the GR-303 interface group. You must provision at least two DS1 lines (primary and secondary) for each interface group.
To provision DS1 lines on an STSX1-CHNL line card, perform the following steps starting in node view:
Step 2 Click VT-DS1 Basic Provision in the function bar. EMS displays the VT-DS1 line provisioning window. (See Figure 10-3.)
Step 3 In the VT-DS1 line provisioning window, set the following parameters:
Step 4 Click Apply to provision the DS1 line.
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Note To reassign an incorrect interface group ID or member ID, first set the ID to 0 and click Apply, then select the correct ID number and click Apply. |
Step 5 Repeat this procedure until all DS1 lines are assigned to the GR-303 interface group. You must provision at least two DS1 lines (primary and secondary) for each interface group.
When assigning CRVs, you cannot use a CRV number twice. The range for the CRVs allocated must be equal to or greater than the actual number of CRVs provisioned.
Local and external CRVs are provisioned in the CRV batch provisioning window. In the CRV batch provisioning window, select DSX1/T1 External CRV Provisioning to provision DSX-1 cards. In the CRV batch provisioning window, select DSX3/STSX1 External CRV Provisioning to provision a DSX3 card or STSX1 card. The EOC provisions the lines in service.
Step 2 From the CRV batch provisioning window, select the Card Type to be provisioned. After selecting a card type, EMS displays the applicable card numbers in the Card List display.
Step 3 In the Card List display, highlight the cards to be provisioned. Click the right arrow icon to move the selected cards to the Selected list.
Step 4 Select the appropriate Interface Group ID (from 1 to 4). To assign CRVs, enter starting and ending values in the CRV Range From and CRV Range To fields.
Step 5 Highlight the lines to be provisioned in the Result list.
Step 6 Click Assign to assign CRVs to the highlighted lines. EMS displays the assigned CRVs in the Result list. (See Figure 10-5.)
To display or delete assigned CRVs, perform the following steps starting in node view:
Step 2 Click the CRV Lists tab to launch the CRV list window. (See Figure 10-6.)
Step 3 Set the following parameters in the CRV list window:
Step 4 Click Show to display the CRV information, including card and line numbers, in the CRV list.
Step 5 To delete a range of assigned CRVs, highlight the CRVs to be deleted in the CRV list and click Delete. EMS confirms the deletion by removing the selected CRVs from the CRV list.
In addition to the batch procedure, you can also provision local CRVs for each individual analog line. To provision an analog line with a local CRV, perform the following steps in node view:
Step 2 In the line provisioning window, set the following parameters:
Step 3 Click Apply to complete GR-303 provisioning for the line.
Step 4 Repeat this procedure to provision additional GR-303 lines.
To change or reset the local CRV of an individual analog line, perform the following steps starting from node view:
Step 2 Change the Interface Group Type of each analog line to be reset to TR-008.
Step 3 Click Apply to complete the change.
Step 4 Change the Interface Group Type of the line back to GR-303, and reassign the CRV as desired. You must also specify the appropriate Interface Group ID.
Step 5 Click Apply to complete the change.
Before provisioning remote CRVs, you must provision an inter node link between the local and remote nodes. See "Inter Node Links," for inter node link provisioning procedures.
To provision remote CRVs, perform the following steps starting in net view:
Step 2 Select Applications > CRV Batch Provisioning from the inter node cross connect display menu. EMS launches the inter node CRV batch provisioning window. (See Figure 10-10.)
Step 3 Select an Interface Group ID to be assigned (from 1 to 4).
Step 4 Set the Allocated Number of CRVs to the number of CRVs for the selected interface group.
Step 5 Click Apply to provision the interface group.
Step 6 Click Inter Node CRV Batch Assignment in the function bar. EMS displays the inter node CRV batch assignment window. (See Figure 10-11.)
Step 7 From the inter node CRV batch provision window, the following parameters must be defined:
After the appropriate cards have been moved to the Selected list, click the List button to display card and line information. (See Figure 10-12.)
Step 8 Set the following fields for remote CRV batch provisioning:
Step 9 Click Assign to provision the CRVs.
To change or reset the CRVs of analog lines, perform the following steps starting in the CRV batch provisioning window:
Step 2 Set the following parameters:
Posted: Mon Sep 25 17:09:03 PDT 2000
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