3Com 3C63100-AC-C - PathBuilder S600..., Reference Manual

Page: 101 / 232

Application Overview 101
You can configure each port on a QSIM, HSIM, or FAM module independently to
provide this type of service, and the PathBuilder S600 will perform the following
functions:
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Q.922 Frame to ATM AAL 5 PDU translation and vice versa
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Frame PVC Management
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Traffic Management
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Congestion Handling
Network Interworking Function Figure 68 shows how an PathBuilder S600
fits into a network interworking configuration.
Figure 68 Frame Rely/ATM Network Interworking Connection
In this configuration, a Frame Relay DTE communicates with the other Frame Relay
DTE through an ATM network. The Frame Relay DTE at either end works exactly
the same way as that in the service Interworking configuration. It passes its data
through Q.922 core service, assuming that there is an end-to-end pipe to carry its
data from its end to the other DTE at the far end. On the other hand, the
application resides in a Frame DTE instead of an ATM DTE. The PathBuilder S600
performs all the required translation and management functions between these
two networks.
HDLC/SDLC
The PathBuilder S600 will SAR AALs and map HDLC/SDLC frames on to an ATM
VCC. You can use the HDLC service for:
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Router to Router Links
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X.25 to X.25 Links
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Other HDLC User
PathBuilder
S600
FR-SSCS
AAL 5
SAR
ATM
PHY PHY
Q.922
DL Core
PathBuilder
S600
FR-SSCS
AAL 5
SAR
ATM
PHY PHY
Q.922
DL Core
Frame
Relay
DTE
PHY
Application
Q.922
DL Core
PHY
Application
Q.922
DL Core
ATM
Network
Frame
Relay
DTE
Frame
Relay
Network
Frame
Relay
Network
Frame
Relay
DTE
Frame
Relay
DTE