Figure 6-2 LSP structure for multiplexing primary subframes of voice calls in Visual C#

Scanner PDF417 in Visual C# Figure 6-2 LSP structure for multiplexing primary subframes of voice calls

Figure 6-2 LSP structure for multiplexing primary subframes of voice calls
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Outer Label (M) CID HDR M O = Channel ID = Header = Mandatory = Optional Inner Label (O) Primary Subframe Primary Subframe
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Primary Subframe
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Primary Payload
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CID 4 Octets Payload Type Counter Length
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The CID permits up to 248 VoMPLS calls to be multiplexed within a single LSP At least one LSP must be created to convey VoMPLS calls; thus, the use of an outer label is mandatory As an implementation option, additional inner LSPs may be created using stacked labels Figure 6-3 depicts an example of a VoMPLS primary frame structure of a single LSP that is used to convey 1 to 248 VoMPLS channels Note that a unique CID identifies each VoMPLS subframe, but that the primary subframes may be transmitted in any order whenever information for a channel is available In order to establish the single-LSP VoMPLS bearer structure depicted in Figure 6-3, the procedure is as follows: 1 A bidirectional LSP is created either by manual provisioning or using an MPLS control protocol (such as constraint-based routing label distribution protocol [CR-LDP] or Resource Reservation ProtocolTraffic Engineering [RSVP-TE]) 2 As voice or audio connections arrive at the LER, a CID value is assigned to the connection (multiplexed) within the LSP This is accomplished by either a A priori coordination of CID value usage In this case, each new call is assigned to an existing CID (in other words, there is no need for per-call signaling) or b An invocation of the signaling control protocol for CIDs to establish bidirectional channels that are used for the audio or voice connection Note: Identification or development of a signaling protocol for this purpose is not the subject of this Implementation Agreement
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CID = n <= 247
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Figure 6-3 Single-LSP structure for multiplexing primary payloads of VoMPLS calls
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Outer Label
CID = 8
CID = 105
Figure 6-4 Stacked-LSP structure for multiplexing primary payloads of VoMPLS calls
Outer Label A Outer Label A Outer Label A
Inner Label B Inner Label C Inner Label Y
CID = 70 CID = 31
CID = 18 CID = 14
CID = n <= 247 CID = n <= 247
CID = 16
CID = 51
CID = n <= 247
Both control and primary subframes may be transmitted in any order whenever information for a channel is available This structure has the potential to convey up to 248 VoMPLS channels multiplied by the number of inner LSPs In order to establish the stacked-LSP VoMPLS bearer structure depicted in Figure 6-4, the procedure is as follows: 1 A bidirectional LSP is created either by manual provisioning or using an MPLS control protocol (such as CR-LDP or RSVP-TE) This LSP is called the outer LSP 2 As voice or audio connections arrive at the LER, an additional LSP might have to be created (multiplexed) within the outer LSP This is accomplished by one of the following: a Repeated invocations of the MPLS control protocol to establish bidirectional inner LSPs that are used for the voice or audio connection
NOTE: A CID that is unique within each inner LSP identifies each VoMPLS subframe That is, CID 16 in LSP-AB is a different channel than CID 16 in LSP-AY
AM FL Y
Figure 6-4 depicts an example of the VoMPLS primary frame structure based on label-stacked inner LSPs The outer label is the same while different inner labels are stacked to expand the multiplexing capability of the outer LSP
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b A priori coordination of inner LSP label value usage In this case, each new call is assigned to an existing LSP (in other words, there is no need for per-call signaling) 3 As voice or audio connections arrive at the LER, a CID value is assigned to the connection (multiplexed) within the inner LSP This is accomplished by a A priori coordination of CID value usage In this case, each new call is assigned to an existing CID (in other words, there is no need for per-call signaling) or b An invocation of a signaling control protocol for CIDs to establish bidirectional channels that are used for the voice or audio connection Control Subframe The MPLS frame structure for control subframes of VoMPLS calls is shown in Figure 6-5
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