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Chapter 5
Using MVIP Switching
5.1 Introduction
5.2 Switch Model
5.2.1 HMIC Switch Blocking
5.3 Signaling Modules and Logical Timeslots on the Local Bus
5.4 Default Connections
5.1 Introduction
This chapter:
Describes the AG 2000 switch model
Describes how signaling modules interface with H.100 timeslots on AG 2000 boards
Describes how signaling modules are automatically routed to DSP resources if switching is not enabled
Explains how you can change this default routing by enabling switching
Refer to
Getting Started With MVIP Switching
for more information about switching.
5.2 Switch Model
Figure 19
shows the AG 2000 switch model. The specific use of each stream is as follows:
H.100 Streams
H.100 Bus
Streams 0..31, timeslots vary based on clock rate:
Streams clocked at 8 MHz: timeslots 0..127
Streams clocked at 4 MHz: timeslots 0..63
Streams clocked at 2 MHz: timeslots 0..31
Local Stream
Line Interface Voice In and Out
Streams 0 and 1, timeslot 0..7
Line Interface Signaling In and Out
Streams 2 and 3, timeslot 0..7
DSP Voice In and Out
Streams 4 and 5, timeslot 0..7
DSP Signaling In and Out
Streams 6 and 7, timeslot 0..7
Figure 19. AG 2000 Switch Model
5.2.1 HMIC Switch Blocking
Switching on the AG 2000 board is implemented by the HMIC chip. The HMIC can perform local bus to local bus switching in full non-blocking fashion.
The number of H.100 connections is limited to a maximum of 128 full duplex or 256 simplex (or half-duplex) connections, in any combination, from either:
H.100 bus to the local bus, or
H.100 bus to H.100 bus
There are no restrictions on local switching. Any local device can be connected to any other local device.
5.3 Signaling Modules and Logical Timeslots on the Local Bus
On the AG 2000 boards, each signaling module is hardwired to a specific logical timeslot on the local bus. Each signaling module supports four ports of telephone network connectivity and is permanently connected to two RJ-14 connectors (also called a
jack
). Each jack is therefore bound to the two corresponding timeslots on the local bus.
Figure 20
shows the relationship between signaling modules, timeslots, and jacks for AG 2000 boards:
Figure 20. Logical Timeslots, Signaling Modules, and RJ-14 Connectors
5.4 Default Connections
If MVIP connectivity is disabled in the AG configuration file (
EnableMVIP=NO
), the following default local connections are nailed up at board initialization:
Switch Connection
MVIP-95
Full duplex connection between line interface voice information and DSP resources.
local:0:0..7 => local:5:0..7
local:4:0..7 => local:1:0..7
Full duplex connection between line interface signaling information and DSP resources.
local:2:0..7 => local:7:0..7
local:6:0..7 => local:3:0..7
Note:
When MVIP connectivity is enabled, there are no default switch connections. Control switching using the CT Access Switching service.
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