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  Viewing MLPPP Properties
Table 26-13 describes the information that is displayed for MLPPP. 
Step 3To view properties for individual MLPPP bundles, double-click the hyperlinked entry in the MLPPP 
Bundle table. 
Table 26-14 describes the information that is displayed in the MLPPP Properties window. 
Table 26-13 MLPPP Properties
Field Description
Type Type of properties; in this case,...

 
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Fragment Disable Whether fragmentation is enabled or disabled: True or False.
Fragment Delay Maximum size, in units of time, for packet fragments on an MLPPP 
bundle. Values range from 1 to 999. 
Fragment Maximum Maximum number of MLPPP bundle fragments. 
Keepalive Retry Number of times that the device sends keepalive packets without 
response before closing...

 
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  Viewing MLPPP Link Properties
Step 4To view the interface properties in physical inventory, double-click the required entry in the ID column. 
Viewing MLPPP Link Properties
An MLPPP link is a link that connects two MLPPP devices. 
To view MLPPP link properties: 
Step 1In the Vision client map view, select a link connected to two MLPPP devices and open the link quick 
view window as...

 
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  Viewing MLPPP Link Properties
Step 3In the link properties window, select the MLPPP link. The link properties are displayed as shown in 
Figure 26-16.
Figure 26-16 MLPPP Link Properties
Table 26-15 describes the information that is displayed for the MLPPP link. 
Table 26-15 MLPPP Link Properties
Field Description
General Properties
Link Type Link protocol. In this case, MLPPP.
Type...

 
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  Viewing MPLS Pseudowire Over GRE Properties
Viewing MPLS Pseudowire Over GRE Properties 
Generic routing encapsulation (GRE) is a tunneling protocol, originated by Cisco Systems and 
standardized in RFC 2784. GRE encapsulates a variety of network layer packets inside IP tunneling 
packets, creating a virtual point-to-point link to devices at remote points over an IP network. GRE...

 
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Table 26-16 describes the information included in the Tunnel Edges table specifically for MPLS 
pseudowire tunnels over GRE. 
Step 4To view GRE Tunnel properties, choose Logical Inventory > GRE Tunnels.
Figure 26-18 shows the Tunnel Edges table that is displayed for GRE tunnels.
Figure 26-18 GRE Tunnel Properties in Logical Inventory 
Table...

 
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  Network Clock Service Overview
Network Clock Service Overview
Network clock service refers to the means by which a clock signal is generated or derived and distributed 
through a network and its individual nodes for the purpose of ensuring synchronized network operation. 
Network clocking is particularly important for mobile service providers to ensure proper transport of 
cellular...

 
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Monitoring Clock Service 
To monitor clock service:
Step 1In the Vision client, right-click the required device, then choose Inventory. 
Step 2In the Inventory window, choose Logical Inventory > Clock. Clock service information is displayed in 
the content pane as shown in Figure 26-19. 
Figure 26-19 Clock Service Properties
Table 26-18 describes the...

 
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Monitoring PTP Service 
In networks that employ TDM, periodic synchronization of device clocks is required to ensure that the 
receiving device knows which channel is which for accurate reassembly of the data stream. The 
Precision Time Protocol (PTP) standard: 
Specifies a clock synchronization protocol that enables this synchronization. 
Applies to...

 
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  Network Clock Service Overview
slave device again calculates the difference and adjusts its clock. This repetitive synchronization ensures 
that device clocks are coordinated and that data stream reassembly is accurate. For configuring PTP, see 
Configuring SONET, page 26-53.