Lucent Technologies PacketStar PSAX 2300, Руководство пользователя

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Chapter 3 System Features
Connections Supported
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PacketStar
®
PSAX 2300 Multiservice Media Gateway User Guide , Issue 1 Release 9.0.0
•
The maximum total number of AAL2 SPVC trunk connections in the chas-
sis must not exceed 32.
• The ATM uplink must be a 6-Port DS1 IMA module.
•
The PSAX with the priority system enabled will work with a PSAX with
passive side SPVCs that has the priority system disabled.
Note:
No preemption of existing connections is supported. Any existing
SVC, PVC, and SPVC connections will not be disconnected to
secure bandwidth for new connections.
Modification of
Parameters for Active
SPVC Connections
Users can now modify traffic descriptors for active ATM-to-ATM VCC SPVC
connections. In previous releases, modifying traffic descriptors required
deleting the connection and creating another one with new traffic descrip-
tors. Tearing down and recreating a connection involves two risks:
•
The connection’s clients might detect the deletion of the SPVC and take
action.
• A different connection request may seize the resources as they are freed by
the release of the deleted connection.
The ability to modify an ATM-to-ATM VCC SPVC while it is active eliminates
these two risks.
Switched Virtual Circuit (SVC) Connections
Switched virtual circuit (SVC) connections are used for voice traffic over a
public ATM WAN or private line network. SVCs are supported on all the ATM
cell-bearing interfaces, including the DS3, E3, OC-3c, STM-1, Multi-Serial,
and High Speed modules. The Multiservice Media Gateway system software
supports the following features:
•
Each ATM port on a single module can be individually configured for ATM
UNI 3.0, UNI 3.1, IISP user, IISP network, or PNNI interfaces.
• SVCs can be allocated on UNI (public and private), IISP, and PNNI inter-
faces.
•
Point-to-point and point-to-multipoint VCC connections are supported.
• VCC connections support both symmetric and asymmetric bandwidth
requirements.
•
An Multiservice Media Gateway system can process 60 calls per second.
Maximum limits include 100 UNIs per system; 5,000 simultaneous point-
to-point SVC call originations, and 2,000 point-to-multipoint call origina-
tions.
• An Multiservice Media Gateway system (equipped with 64 MB of memory
on the CPU module) can process a maximum of 20,000 simultaneous SVC
calls in progress.
•
The maximum individual call setup time is 16 milliseconds (ms). The mini-
mum call setup time for SVCs is approximately 10 ms from the time the
call setup message enters the CPU module until the acknowledgment
leaves the CPU module.