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System Overview
Plexus 9000 Planning and Engineering Guide
Issue 6, May 14, 2004
Section 130-110-000
3-26
Telica,
Inc.
3.5.1.4
Voice over IP (VoIP)
The Plexus 9000 also supports Voice over IP (VoIP) applications acting as
a Media Gateway. The VoIP MG mediates voice traffic between the
PSTN and a packet network. The VoIP MG does not retain either the
signaling gateway or call control functions. Instead, the VoIP MG
implements the Megaco protocol in order to obtain the relevant call
control instructions from a third-party softswitch (Media Gateway
Controller).
3.5.1.5
Voice Trunking over ATM (VToA)
The Plexus 9000 supports Voice Trunking over ATM (VToA) by mapping
DS0s that enter the Plexus through the DS1 or DS3 IOMs into ATM cells.
The cells are delivered to an ATM network via OC-12c ANA cards or
eight port DS3 ATM interface modules, using AAL2 switched virtual
circuits. ATM switches route the cells to other VToA gateways where
TDM traffic is recovered and delivered to subscribers.
The Plexus does this on a call-by-call basis, using SS7 signaling
information to assign a DS0 to the correct ATM cell. If a cell to the
destination does not currently exist, the Plexus establishes a connection to
the remote gateway using AAL2 signaling techniques, gets the correct
address for the cell, and puts the TDM traffic in it. Up to 240 separate
DS0 calls can be supported in one such ATM connection before a second
one has to be established.
3.6 System
Management
System management of the Plexus 9000 includes provisioning and
alarming processes, and local and remote access functions. These
functions are provided as a subset of the activities of the SP and Timing
modules.
3.6.1 Provisioning
Interfaces
The system may be provisioned via a TL1 command line interface, the
PlexView Element Management System (EMS), or a Simple Network
Management Protocol (SNMP) manager.
The TL1 command line interface may be accessed through the craft
terminal directly or through the OS Ethernet interface via Telnet. A
complete list of TL1 commands is provided in the
TL1 Commands
Reference Guide
.