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This chapter provides information about provisioning CBR to ATM interworking services.
Circuit emulation is a multiplexing technique that adapts circuit switching traffic to and from ATM traffic at the AAL1 layer. The AAL1 layer is responsible for the adaptation of CBR traffic. Because voice services are essentially CBR data (with requirements for a fixed amount of bandwidth, low cell loss, and strict delay parameters), the ATM Forum's AAL1 standards are used for circuit emulation services.
The configurable parameters for CBR-ATM interworking are the same as the configurable parameters for CBR and ATM. They are:
For more information about each of these parameters, refer to the chapters titled "Provisioning Private Line Services" and "Provisioning ATM Services."
You can create Service object profiles for the various types of CBR-ATM interworking services. When you use a Service object profile, CPC uses the values that you have specified in the profile to create the service. Profiles provide an easy way to store information about the different various types of CBR-ATM interworking services that you will be provisioning.
Figure 16-1 shows the CBR-ATM Interworking Service Profile Object Viewer.
The attributes for which you can provide values in the CBR-ATM Interworking Service object profile are outlined in Table 16-1. For attributes that do not have acceptable values listed in Table 16-1 below, refer to the chapter titled "Configuring the Cisco 6400 Equipment Module" for a list of ranges that the equipment supports.
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Note For attributes that do not have acceptable values listed in the Table 16-1 below, refer to the chapter titled "Configuring the Cisco 6400 Equipment Module" for a list of ranges that the equipment supports. |
| Attribute | Description | Acceptable Values | Default Value |
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SE Profile Name | This is the name of the Service element profile for the equipment module. Note that if you do not specify a name here the default Service element profile for each of the networks your service is traversing will be used. |
| Default |
Recovery Priority | This is the recovery priority for NNI resiliency. | 0...n where 0 has infinitely low priority, 1 has the highest priority, and n has lower priority. | 5 |
Partial Cell Fill (0..46 bytes) | This specifies the number of octets per cell, when partial cell fill is used. | 0-47 | 0 |
Flow Type | This indicates the direction of the flow of data traffic in this connection. Duplex indicates that the data flows in two directions between the two connection points. SimplexAZ indicates that the data only flows in one direction AZ. | Duplex or SimplexAZ | Duplex |
Clock Mode | Select whether the clocking mode of the CBR service is to be synchronous, or srts. | Sync, Srts, | Sync |
Channel Associated Signalling | This specifies the channel associated signalling bits carried by the service. | Basic, E1, DS1SF, DS1ESF, | Basic |
Cell Loss Integration Period | This specifies the cell loss integration period (in ms). | 1000-65535 | 2500 |
Max Tolerated CDV Jitter | This specifies the maximum cell arrival jitter the reassembly process can tolerate. | 100-65535 | 100 |
Re-assembly Buffer Size (microsec) | This specifies the maximum size of the buffer. | 0-65535 | 128 |
Peak Cell Rate (cells/s) | This is the peak cell rate, which is the maximum allowed cell transmission rate (expressed in cells per second). It defines the shortest time period between cells and provides the highest guarantee that network performance objectives (based on cell loss ratio) will be met. |
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CDVT | Cell Delay Variation Tolerance establishes the time scale over which the PCR is policed. This is set to allow for jitter (CDV). |
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Peak to Peak Cell Delay Variation | Cell delay variation (CDV) represents the difference between the maximum CTD and the minimum CTD. |
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Max Cell Transfer Delay | Cell transfer delay is the time elapsed between departure time of a cell from the generating endsystem and the arrival time at the destination. |
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Cell Loss Ratio | The cell loss ration QoS parameter is defined on a per connection basis as the number of lost cells divided by the total number of transmitted cells. |
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Step 2 Double-click the Service Application folder to open it.
Step 3 Double-click the Private Line Service Application folder to open it.
Step 4 Click the CBR to ATM Interworking Service Profile folder to highlight it.
Step 5 Click the Object Viewer button on the toolbar.
Step 6 Click to highlight an empty cell in the Service Profile Subset Viewer. Enter the required attribute values and specify a name for a new Service Profile.
Step 7 Save the profile by clicking the save button on the toolbar.
Step 8 Apply the Transaction by clicking the apply button on the toolbar.
Step 2 Double-click the Service Application folder to open it.
Step 3 Double-click the Private Line Service Application folder to open it.
Step 4 Click the CBR to ATM Interworking Service Profile folder to highlight it.
Step 5 Click the Object Viewer button on the toolbar.
Step 6 Click to highlight an empty cell in the Service Profile Subset Viewer. Enter the required attribute values and specify a name for a new Service Profile.
Step 7 Save the profile by clicking the save button on the toolbar.
Step 8 Apply the Transaction by clicking the apply button on the toolbar.
Step 2 Double-click the Service Application folder to open it.
Step 3 Double-click the Private Line Service Application folder to open it.
Step 4 Double-click a type of profile that contains a specific profile that you want to delete (i.e. CBR-ATM Interworking Service Profile).
Step 5 Click the specific profile and click the delete button on the toolbar.
Step 6 Apply the Transaction by clicking the apply button on the toolbar.
Step 2 Double-click the Service Application folder to open it.
Step 3 Double-click the Private Line Service Application folder to open it.
Step 4 Click the CBR to ATM Interworking Service folder to highlight it.
Step 5 Click the Object Viewer button on the toolbar.
Step 6 Click to highlight an empty cell in the CBR to ATM Interworking Service Subset Viewer. Enter the required attribute values and specify a name for a new Service. The required values are:
Step 7 Save the Service by clicking the save button on the toolbar.
Step 8 Apply the Transaction by clicking the apply button on the toolbar.
Figure 16-2 shows the CBR-ATM Interworking Service Object Viewer.
Step 2 Double-click the Service Application folder to open it.
Step 3 Double-click the Private Line Service Application folder to open it.
Step 4 Double-click the CBR to ATM Interworking Service folder to open it.
Step 5 Click the specific service object to open it
Step 6 Click the delete button on the toolbar.
Step 7 Apply the Transaction by clicking the apply button on the toolbar.
Posted: Thu Aug 3 16:43:17 PDT 2000
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