5.1 Introduction

5.2 AG 4000C Switch Model

5.2.1 Lucent T8100A Switch Blocking

5.3 T1 Trunk Channels and H.110 Timeslots

5.3.1 T1 Channels/Timeslots for Channel Associated Signaling

5.3.2 T1 Channels/Timeslots for Common Channel Signaling

5.3.3 T1 Channels and Timeslots for RAW Mode

5.4 E1 Trunk Channels and Timeslots

5.4.1 E1 Signaling for Channel Associated Signaling

5.4.2 E1 Signaling/Timeslots for Common Channel Signaling

5.4.3 E1 Channels and Timeslots for RAW Mode

5.5 Default Connections for Standalone Board

5.1 Introduction

This chapter describes:

• The AG 4000C switch model.

• How trunk channels interface with H.110 timeslots on AG 4000C boards.

• How trunk channels are automatically routed to DSP resources if switching is not enabled.

Refer to Getting Started With MVIP Switching for more information about switching.

5.2 AG 4000C Switch Model

Figure 22 shows the AG 4000C switch model. The specific use of each stream is as follows:

H.110 Streams
H.110 Bus	Streams 0..31, timeslots 0..127 (Streams clocked at 8 MHz)

Local Streams
Trunk voice information	Trunk 1: Streams 0 and 1, timeslots 0..23 (or 29) Trunk 2: Streams 4 and 5, timeslots 0..23 (or 29) Trunk 3: Streams 8 and 9, timeslots 0..23 (or 29) Trunk 4: Streams 12 and 13, timeslots 0..23 (or 29) (With AG 4000C Ts, timeslots 0..23 are present. With AG 4000C Es, timeslots 0..29 are present.)
Trunk signaling information	Trunk 1: Streams 2 and 3 Trunk 2: Streams 6 and 7 Trunk 3: Streams10 and 11 Trunk 4: Streams 14 and 15 The timeslots used for the signaling information depend on the board type (T1 or E1) and the board configuration (NetworkInterface.T1E1[x].SignalingType). For more information, refer to Section 5.3.
DSP voice information	Streams 16 and 17, timeslots 0..127
DSP signaling information	Streams 18 and 19, timeslots 0..127
HDLC controllers	Trunk 1: Streams 20 and 21 Trunk 2: Streams 22 and 23 Trunk 3: Streams 24 and 25 Trunk 4: Streams 26 and 27 A switch connection must be made to connect the appropriate signaling stream to the HDLC controller.

Figure 22. AG 4000C Switch Model

5.2.1 Lucent T8100A Switch Blocking

The AG 4000C board switching is implemented by the Lucent T8100A chip (HMIC). The Lucent T8100A can perform local bus to local bus switching in full non-blocking fashion.

The number of H.110 connections is limited to a maximum of 128 full duplex or 256 simplex (or half duplex) connections, in any combination, from either:

• H.110 bus to the local bus, or

• H.110 bus to H.110 bus

5.3 T1 Trunk Channels and H.110 Timeslots

AG 4000C T boards place the voice and signaling information from the T1 trunk in timeslots in local streams. The actual timeslots used depend upon how you have configured the board (NetworkInterface.T1E1[x].SignalingType). For more information, refer to Chapter 6.

5.3.1 T1 Channels/Timeslots for Channel Associated Signaling

If NetworkInterface.T1E1[x].SignalingType = CAS (its default setting), information is routed to accommodate a T1 channel associated signaling configuration, where:

• Voice information is transmitted in each channel on the T1 trunk.

• Signaling information is transmitted in each channel using robbed-bit signaling.

On the local bus, this information is presented as follows:

• Voice information from each channel is placed in a corresponding timeslot on the local bus in the following streams:

• Trunk 1 - stream 0 and stream 1

• Trunk 2 - stream 4 and stream 5

• Trunk 3 - stream 8 and stream 9

• Trunk 4 - stream 12 and stream 13

Signaling information from each channel is placed in a corresponding timeslot on the local bus in the following streams:

Trunk 1 - stream 2 and stream 3

Trunk 2 - stream 6 and stream 7

Trunk 3 - stream 10 and stream 11

Trunk 4 - stream 14 and stream 15

Figure 23. Connecting T1 Timeslots (CAS Mode)

5.3.2 T1 Channels/Timeslots for Common Channel Signaling

If NetworkInterface.T1E1[x].SignalingType = PRI, signaling information is routed to accommodate the T1 ISDN common channel signaling configuration, where:

• Voice information is transmitted in the first 23 channels.

• Signaling information is transmitted in the last channel (the D channel).

This configuration is typically used in ISDN applications for trunks carrying the D channel.

The AG 4000C T boards route this information as follows:

• Each voice channel on the T1 trunk is placed in a corresponding timeslot on the local bus in the following streams:

• Trunk 1 - stream 0 and stream 1

• Trunk 2 - stream 4 and stream 5

• Trunk 3 - stream 8 and stream 9

• Trunk 4 - stream 12 and stream 13
  

All signaling information from channel 23 (the D channel) is placed on the local bus in timeslot 0 in the following streams:

Trunk 1 - stream 2 and stream 3

Trunk 2 - stream 6 and stream 7

Trunk 3 - stream 10 and stream 11

Trunk 4 - stream 14 and stream 15

Switch connections should be made to connect these streams to the HDLC controllers that process the D channel information from each frame.

Figure 24. Connecting T1 Timeslots (PRI Mode)

5.3.3 T1 Channels and Timeslots for RAW Mode

If NetworkInterface.T1E1[x].SignalingType = RAW, information is routed to accommodate a configuration where no D channel is present on the T1 trunk (refer to Appendix C):

• Voice information is transmitted in all 24 channels.

• No signaling information is transmitted (it is assumed that another T1 trunk is carrying a D channel containing all signaling for all trunks).

This configuration is typically used in Non-Facility Associated Signaling (NFAS) configurations.

The AG 4000C T boards route this information as follows (refer to Figure 25):

• Each voice channel on the T1 trunk is placed in a corresponding timeslot on the local bus in the following streams:

• Trunk 1 - stream 0 and stream 1

• Trunk 2 - stream 4 and stream 5

• Trunk 3 - stream 8 and stream 9

• Trunk 4 - stream 12 and stream 13
  

Any signaling information is ignored.

Figure 25. Connecting T1 Timeslots (RAW Mode)

5.4 E1 Trunk Channels and Timeslots

For NetworkInterface.T1E1[x].SignalingType = CAS or = PRI, the AG 4000C E board routes the voice information as follows:

• E1 timeslots 1 through 15 are assigned to the local bus timeslots 0..14 and E1 timeslots 17 through 31 are assigned to the local bus timeslots 15..29 in the following streams:

• Trunk 1 - stream 0 and stream 1

• Trunk 2 - stream 4 and stream 5

• Trunk 3 - stream 8 and stream 9

• Trunk 4 - stream 12 and stream 13
  

Figure 26 illustrates how voice channel data is assigned to timeslots:

Figure 26. Connecting E1 B Channels to Timeslots

5.4.1 E1 Signaling for Channel Associated Signaling

If NetworkInterface.T1E1[x].SignalingType = CAS (the default setting), signaling information is routed to accommodate an E1 channel associated signaling configuration, where E1 channel 16 carries signaling information for all other channels. The signaling information is broken out and placed on the corresponding signaling stream for that trunk. The signaling information is in the following streams:

• Trunk 1 - stream 2 and stream 3

• Trunk 2 - stream 6 and stream 7

• Trunk 3 - stream 10 and stream 11

• Trunk 4 - stream 14 and stream 15
  

The signaling information is placed in the same timeslot number as the voice information for that channel.

Figure 27 illustrates how signaling data is distributed:

Figure 27. Breaking Out Signaling Information From E1 Stream 16 (CAS Mode)

5.4.2 E1 Signaling/Timeslots for Common Channel Signaling

If NetworkInterface.T1E1[x].SignalingType = PRI, signaling information is routed differently to accommodate an ISDN common channel signaling configuration, where CCS signaling packets are transmitted in channel 16 instead of CAS bits. All signaling information from channel 16 is placed directly into timeslot 0:

• Trunk 1 - stream 2 and stream 3

• Trunk 2 - stream 6 and stream 7

• Trunk 3 - stream 10 and stream 11

• Trunk 4 - stream 14 and stream 15
  

Switch connections must be made to connect these streams to the HDLC controllers, which processes the D channel information from each frame.

Figure 28. Routing E1 Stream 16 Data To HDLC Controller (PRI Mode)

5.4.3 E1 Channels and Timeslots for RAW Mode

If NetworkInterface.T1E1[x].SignalingType is set to RAW:

• Voice information is transmitted in all 31 channels; and

• No signaling information is transmitted (it is assumed that another E1 trunk is carrying a D channel containing all signaling for all trunks).

The AG 4000C E routes this information as follows (refer to Figure 29):

• Each voice channel on the trunk is placed in a corresponding timeslot on the local bus in the following streams:

• Trunk 1 - stream 0 and stream 1

• Trunk 2 - stream 4 and stream 5

• Trunk 3 - stream 8 and stream 9

• Trunk 4 - stream 12 and stream 13

Any signaling information is ignored.

Figure 29. Connecting E1 Timeslots (RAW Mode)

5.5 Default Connections for Standalone Board

If a board is configured for standalone operation (Clocking.HBus.ClockMode = STANDALONE), the DSPs and trunks are connected as shown in the following tables. The exact settings depend upon the setting of NetworkInterface.T1E1[x].SignalingType, as shown in this table:

Setting	Default Routing for AG 4000C T Boards
CAS	Full duplex connection between trunk voice information and DSP resources: Trunk 1: 0:0..23 => 17:0..23, 16:0..23 => 1:0..23 Trunk 2: 4:0..23 => 17:24..47, 16:24..47 => 5:0..23 Trunk 3: 8:0..23 => 17:48..71, 16:48..71 => 9:0..23 Trunk 4: 12:0..23 => 17:72..95, 16:72..95 => 13:0..23 Full duplex connection between trunk signaling information and DSP resources: Trunk 1: 2:0..23 => 19:0..23, 18:0..23 => 3:0..23 Trunk 2: 6:0..23 => 19:24..47, 18:24..47 => 7:0..23 Trunk 3: 10:0..23 => 19:48..71, 18:48..71 => 11:0..23 Trunk 4: 14:0..23 => 19:72..95, 18:72..95 => 15:0..23
PRI	Full duplex connection between trunk voice information and DSP resources: Trunk 1: 0:0..22 => 17:0..22, 16:0..22 => 1:0..22 Trunk 2: 4:0..22 => 17:24..46, 16:24..46 => 5:0..22 Trunk 3: 8:0..22 => 17:48..70, 16:48..70 => 9:0..22 Trunk 4: 12:0..22 => 17:72..94, 16:72..94 => 13:0..22 Note: timeslots 23, 47, 71, and 95 are unused on streams 16 and 17. Full duplex connection between HDLC controller and the signaling streams. This is done because the runfile can only access information on these streams: Trunk 1: 2:0 => 21:0, 20:0 => 3:0 Trunk 2: 6:0 => 23:0, 22:0 => 7:0 Trunk 3: 10:0 => 25:0, 24:0 => 11:0 Trunk 4: 14:0 => 27:0, 26:0 => 15:0
RAW	Full duplex connection between trunk voice information and DSP resources: Trunk 1: 0:0..23 => 17:0..23, 16:0..23 => 1:0..23 Trunk 2: 4:0..23 => 17:24..47, 16:24..47 => 5:0..23 Trunk 3: 8:0..23 => 17:48..71, 16:48..71 => 9:0..23 Trunk 4: 12:0..23 => 17:72..95, 16:72..95 => 13:0..23

Setting	Default Routing for AG 4000C E Boards
CAS	Full duplex connection between the trunk voice information and the DSP resources: Trunk 1: 0:0..29 => 17:0..29, 16:0..29 => 1:0..29 Trunk 2: 4:0..29 => 17:30..59, 16:30..59 => 5:0..29 Trunk 3: 8:0..29 => 17:60..89, 16:60..89 => 9:0..29 Trunk 4: 12:0..29 => 17:90..119, 16:90..119 => 13:0..29 Full duplex connection between trunk signaling information and the DSP resources: Trunk 1: 2:0..29 => 19:0..29, 18:0..29 => 3:0..29 Trunk 2: 6:0..29 => 19:30..59, 18:30..59 => 7:0..29 Trunk 3: 10:0..29 => 19:60..89, 18:60..89 =>11:0..29 Trunk 4: 14:0..29 => 19:90..119, 18:90..119 => 15:0..29
PRI	Full duplex connection between the trunk voice information and the DSP resources: Trunk 1: 0:0..29 => 17:0..29, 16:0..29 => 1:0..29 Trunk 2: 4:0..29 => 17:30..59, 16:30..59 => 5:0..29 Trunk 3: 8:0..29 => 17:60..89, 16:60..89 => 9:0..29 Trunk 4: 12:0..29 => 17:90..119, 16:90..119 => 13:0..29 Full duplex connection between HDLC controller and the signaling streams. This is done because the runfile can only access information on these streams: Trunk 1: 2:0 => 21:0, 20:0 => 3:0 Trunk 2: 6:0 => 23:0, 22:0 => 7:0 Trunk 3: 10:0 => 25:0, 24:0 => 11:0 Trunk 4: 14:0 => 27:0, 26:0 => 15:0.
RAW	Full duplex connection between trunk voice information and DSP resources: Trunk 1: 0:0..30 => 17:0..30, 16:0..30 => 1:0..30 Trunk 2: 4:0..30 => 17:31..61, 16:31..61 => 5:0..30 Trunk 3: 8:0..30 => 17:62..92, 16:62..92 => 9:0..30 Trunk 4: 12:0..30 => 17:93..123, 16:93..123 => 13:0..30

You may wish to change this default routing so the board can interoperate with other boards connected to it over the H.110 bus. To do so, disable the automatic routing by setting SwitchConnections = NO.

When the bus is enabled (Clocking.HBus.ClockMode is not equal to STANDALONE), there is no default routing, unless you set SwitchConnections = YES.