255-700-447
3-5
PacketStar
®
PSAX 2300 Multiservice Media Gateway User Guide
, Issue 1
Release 9.0.0
Chapter 3 System Features
Connections Supported
The SPVC Priority Reconnection feature supports all SPVC connection types.
All SPVCs compress voice when configured with the appropriate DSP2x Voice
Server module. SPVC connections are rerouted in the event of link failure.
Figure 3-1 shows some sample user-assigned priority SPVCs.
The priority reconnection scheme is invoked by one of the following events:
•
Chassis reboot
•
IMA link failure followed by SPVC reconnection attempts
Upon IMA link failure, all SVC and SPVC calls are disconnected. SPVC calls
are then reconnected according to the priority scheme designated by the
user.
A PSAX system using the user-defined reconnection priority scheme must
meet the following requirements:
•
Only active-side SPVCs are permitted in the configuration (no SVCs)
Table 3-1. Sample User-Defined Priority Scheme for Reconnecting SPVC ATM IMA Links
User-Assigned
Priority Code
Traffic Type
Typical ATM Service Type
1
TDMA/CDMA control channels
AMPS channel reserved for 911
emergency calls
CBR-1 or VBR-express
CBR-2
2
GSM control channels
VBR-express
3
Digital voice channels
VBR-express
4
GSM voice channels
CBR-2
5
Most analog voice channels
VBR-rt2 (will now try CBR-3)
6
Management data connections
UBR
Figure 3-1. Sample SPVC Reconnection Prioritization Scheme
AAL2
CIDs
(max. 247)
AAL2
CIDs
(max. 247)
DS1/T1 IMA Link
Sample Priority 2,
Sample Priority 1,
Sample Priority 0,
A
B
C
PVC
AAL2 Trunk for HDLC SPVC
AAL2 Trunk for CE SPVC
PSAX System
A
B
C