Beta Draft Confidential
About SVCs
About Proxy Signaling
ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000 1/19/0516-19
Figure 16-9. Establishing SVCs for Endsystem via PSA
PSA
To define SVC proxy signaling functions, you must first configure the Signaling
attributes for an ATM UNI DCE logical port, and set Proxy Signaling to Proxy Agent.
Signaling must be enabled (see “Signaling Attributes for SVCs” on page 17-11).
Acting as the PSA, the UNI DCE port uses VPI/VPCI mapping to determine if a
particular SVC request is destined for a PSC. With UNI 4.0 signaling, VPCI mapping
provides an alias that represents the PSC’s logical port and VPI address. Each PSC
needs a unique VPCI. For example, using the Signaling tab in the Configure SVC
dialog box (Figure 17-5 on page 17-11), configure the following VPCI mapping on a
PSA port:
• VPCI 1 means VPI 0 on port 12
• VPCI 2 means VPI 0 on port 13
If the SVC request does not include a VPCI (UNI 3.X signaling), the PSA port
performs a routing lookup on the calling party address to determine the appropriate
PSC. It matches the calling party address to a logical port, and then uses the VPCI that
corresponds to the logical port.
PSA
Cannot Signal
User
User
Network
Network
Endsystem
A
Endsystem
B
.
.
.
Setup
Connect
SVC Established
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