# CAS mode switching

This topic contains the following CAS mode switching information:

- CAS switching limitations

- CAS mode switch model

- H.110 and local streams

- Voice and signaling information routing on T1 trunks

- Voice and signaling information routing on E1 trunks

- Default connections

## CAS switching limitations

CG 6060C boards terminate CAS signaling on local T1 and E1 trunks. In CAS mode, CG 6060C boards support signaling streams on the DSPs and the framers. These streams are provided for backward compatibility with applications that switch signaling streams.

The CG 6060C switch model supports full duplex connections between DSP signaling and trunk signaling. However, the CG 6060C board does not support any other CAS signaling connections.

CG 6060C boards do not support DSP-to-DSP signaling connections (such as local stream:timeslot 66:0 to local stream:timeslot 67:4), trunk-to-trunk signaling connections (such as local stream:timeslot 2:0 to local stream:timeslot 7:3), or signaling-to-bus connections (such as local stream:timeslot 2:0 to MVIP stream:timeslot 0:0 or local stream:timeslot 66:0 to MVIP stream:timeslot 0:0).

## CAS mode switch model

The following illustration shows the CG 6060C switching model in CAS mode:

## H.110 and local streams

The following tables list the specific use of each stream in the CG 6060C CAS switching model:

### H.110 streams

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

### Local streams

Trunk voice information (T1 trunks) | Trunk 1: Streams 0 and 1, Trunk 2: Streams 4 and 5, Trunk 3: Streams 8 and 9, Trunk 4: Streams 12 and 13, Trunk 5: Streams 16 and 17, Trunk 6: Streams 20 and 21, Trunk 7: Streams 24 and 25, Trunk 8: Streams 28 and 29, Trunk 9: Streams 32 and 33, Trunk 10: Streams 36 and 37, Trunk 11: Streams 40 and 41, Trunk 12: Streams 44 and 45, Trunk 13: Streams 48 and 49, Trunk 14: Streams 52 and 53, Trunk 15: Streams 56 and 57, Trunk 16: Streams 60 and 61 | timeslots 0..23 timeslots 0..23 timeslots 0..23 timeslots 0..23 timeslots 0..23 timeslots 0..23 timeslots 0..23 timeslots 0..23 timeslots 0..23 timeslots 0..23 timeslots 0..23 timeslots 0..23 timeslots 0..23 timeslots 0..23 timeslots 0..23 timeslots 0..23
Trunk voice information (E1 trunks) | Trunk 1: Streams 0 and 1, Trunk 2: Streams 4 and 5, Trunk 3: Streams 8 and 9, Trunk 4: Streams 12 and 13, Trunk 5: Streams 16 and 17, Trunk 6: Streams 20 and 21, Trunk 7: Streams 24 and 25, Trunk 8: Streams 28 and 29, Trunk 9: Streams 32 and 33, Trunk 10: Streams 36 and 37, Trunk 11: Streams 40 and 41, Trunk 12: Streams 44 and 45, Trunk 13: Streams 48 and 49, Trunk 14: Streams 52 and 53, Trunk 15: Streams 56 and 57, Trunk 16: Streams 60 and 61 | timeslots 0..29 timeslots 0..29 timeslots 0..29 timeslots 0..29 timeslots 0..29 timeslots 0..29 timeslots 0..29 timeslots 0..29 timeslots 0..29 timeslots 0..29 timeslots 0..29 timeslots 0..29 timeslots 0..29 timeslots 0..29 timeslots 0..29 timeslots 0..29
Trunk signaling information (T1 trunks) | Trunk 1: Streams 2 and 3, Trunk 2: Streams 6 and 7, Trunk 3: Streams 10 and 11, Trunk 4: Streams 14 and 15, Trunk 5: Streams 18 and 19, Trunk 6: Streams 22 and 23, Trunk 7: Streams 26 and 27, Trunk 8: Streams 30 and 31, Trunk 9: Streams 34 and 35 Trunk 10: Streams 38 and 39 Trunk 11: Streams 42 and 43 Trunk 12: Streams 46 and 47 Trunk 13: Streams 50 and 51 Trunk 14: Streams 54 and 55 Trunk 15: Streams 58 and 59 Trunk 16: Streams 62 and 63 | timeslots 0..23 timeslots 0..23 timeslots 0..23 timeslots 0..23 timeslots 0..23 timeslots 0..23 timeslots 0..23 timeslots 0..23 timeslots 0..23 timeslots 0..23 timeslots 0..23 timeslots 0..23 timeslots 0..23 timeslots 0..23 timeslots 0..23 timeslots 0..23
Trunk signaling information (E1 trunks) | Trunk 1: Streams 2 and 3, Trunk 2: Streams 6 and 7, Trunk 3: Streams 10 and 11, Trunk 4: Streams 14 and 15, Trunk 5: Streams 18 and 19, Trunk 6: Streams 22 and 23, Trunk 7: Streams 26 and 27, Trunk 8: Streams 30 and 31, Trunk 9: Streams 34 and 35 Trunk 10: Streams 38 and 39 Trunk 11: Streams 42 and 43 Trunk 12: Streams 46 and 47 Trunk 13: Streams 50 and 51 Trunk 14: Streams 54 and 55 Trunk 15: Streams 58 and 59 Trunk 16: Streams 62 and 63 | timeslots 0..29 timeslots 0..29 timeslots 0..29 timeslots 0..29 timeslots 0..29 timeslots 0..29 timeslots 0..29 timeslots 0..29 timeslots 0..29 timeslots 0..29 timeslots 0..29 timeslots 0..29 timeslots 0..29 timeslots 0..29 timeslots 0..29 timeslots 0..29
DSP voice information | Streams 64 and 65, timeslots 0.. up to 899
DSP signaling information | Streams 66 and 67, timeslots 0..511

## Voice and signaling information routing on T1 trunks (CAS mode)

If NetworkInterface.T1E1[x].SignalingType = CAS (the default setting), voice and signaling information is routed to accommodate a T1 channel associated signaling configuration. Voice information is transmitted in each channel on the T1 trunk and each channel is placed in a corresponding timeslot on the local bus.

Signaling information is transmitted in each channel using robbed-bit signaling. The signaling information is broken out and placed on the corresponding signaling stream for that trunk. The signaling information for a given channel is placed in the same timeslot number as the voice information for that channel.

Note: The CG 6060C board does not allow signaling streams to be connected to the CT bus.

The following illustration shows how data is assigned to timeslots on a T1 trunk (CAS mode):

## Voice and signaling information routing on E1 trunks (CAS mode)

Regardless of the NetworkInterface.T1E1[x].SignalingType setting, the CG 6060C board routes voice information by assigning E1 timeslots 1 through 15 to the local bus timeslots 0..14. E1 timeslots 17 through 31 are assigned to the local bus timeslots 15..29. Timeslot 0 on the E1 line carries framing data.

The following illustration shows how voice channel data is assigned to timeslots (CAS mode):

If NetworkInterface.T1E1[x].SignalingType = CAS (the default setting), signaling information is routed to accommodate channel associated signaling. Line channel 16 carries the signaling information for all channels.

Signaling information is broken out and placed on the corresponding signaling stream for that trunk. The signaling information for a given channel is placed in the same timeslot number as the voice information for that channel.

Note: The CG 6060C board does not allow signaling streams to be connected to the CT bus.

The following illustration shows how signaling data is distributed from E1 stream 16 (CAS mode). Although the streams are shown here, they cannot be switched to the CT bus:

## Default connections (CAS mode)

If a board is configured for standalone operation (Clocking.HBus.ClockMode = STANDALONE), the DSPs and trunks are connected as shown in the following tables.

Note: The SwitchConnections keyword can override this setting.

The exact settings for CG 6060C boards configured as T1 or E1 depend upon the setting of the NetworkInterface.T1E1[x].SignalingType keyword.

The Voice information and DSP resources table and the Signaling information and DSP resources table show the default routing for CG 6060C boards in CAS mode.

### Voice information and DSP resources

Trunk type | Full duplex connection between the trunk voice information and the DSP resources...
--- | ---
T1 | Trunk 1: 0:0..23 => 65:0..23, Trunk 2: 4:0..23 => 65:24..47, Trunk 3: 8:0..23 => 65:48..71, Trunk 4: 12:0..23 => 65:72..95, Trunk 5: 16:0..23 => 65:96..119, Trunk 6: 20:0..23 => 65:120..143, Trunk 7: 24:0..23 => 65:144..167, Trunk 8: 28:0..23 => 65:168..191, Trunk 9: 32:0..23 => 65:192..215, Trunk 10: 36:0..23 => 65:216..239, Trunk 11: 40:0..23 => 65:240..263, Trunk 12: 44:0..23 => 65:264..287, Trunk 13: 48:0..23 => 65:288..311, Trunk 14: 52:0..23 => 65:312..335, Trunk 15: 56:0..23 => 65:336..359, Trunk 16: 60:0..23 => 65:360..383 | 64:0..23 => 1:0..23 64:24..47 => 5:0..23 64:48..71 => 9:0..23 64:72..95 => 13:0..23 64:96..119 => 17:0..23 64:120..143 => 21:0..23 64:144..167 => 25:0..23 64:168..191 => 23:0..23 64:192..215 => 33:0..23 64:216..239 => 37:0..23 64:240..263 => 41:0..23 64:264..287 => 45:0..23 64:288..311 => 49:0..23 64:312..335 => 53:0..23 64:336..359 => 57:0..23 64:360..383 => 61:0..23
E1 | Trunk 1: 0:0..29 => 65:0..29, Trunk 2: 4:0..29 => 65:30..59, Trunk 3: 8:0..29 => 65:60..89, Trunk 4: 12:0..29 => 65:90..119, Trunk 5: 16:0..29 => 65:120..149, Trunk 6: 20:0..29 => 65:150..179, Trunk 7: 24:0..29 => 65:180..209, Trunk 8: 28:0..29 => 65:210..239, Trunk 9: 32:0..29 => 65:240..269, Trunk 10: 36:0..29 => 65:270..299, Trunk 11: 40:0..29 => 65:300..329, Trunk 12: 44:0..29 => 65:330..359, Trunk 13: 48:0..29 => 65:360..389, Trunk 14: 52:0..29 => 65:390..419, Trunk 15: 56:0..29 => 65:420..449, Trunk 16: 60:0..29 => 65:450..479 | 64:0..29 => 1:0..29 64:30..59 => 5:0..29 64:60..89 => 9:0..29 64:90..119 => 13:0..29 64:120..149 => 17:0..29 64:150..179 => 21:0..29 64:180..209 => 25:0..29 64:210..239 => 29:0..29 64:240..269 => 33:0..29 64:270..299 => 37:0..29 64:300..329 => 41:0..29 64:330..359 => 45:0..29 64:360..389 => 49:0..29 64:390..419 => 53:0..29 64:420..449 => 57:0..29 64:450..479 => 61:0..29

### Signaling information and DSP resources

Trunk type | Full duplex connection between trunk signaling information and the DSP resources...
--- | ---
T1 | Trunk 1: 2:0..23 => 67:0..23, Trunk 2: 6:0..23 => 67:24..47, Trunk 3: 10:0..23 => 67:48..71, Trunk 4: 14:0..23 => 67:72..95, Trunk 5: 18:0..23 => 67:96..119, Trunk 6: 22:0..23 => 67:120..143, Trunk 7: 26:0..23 => 67:144..167, Trunk 8: 30:0..23 => 67:168..191, Trunk 9: 34:0..23 => 67:192..215, Trunk 10: 38:0..23 => 67:216..239, Trunk 11: 42:0..23 => 67:240..263, Trunk 12: 46:0..23 => 67:264..287, Trunk 13: 50:0..23 => 67:288..311, Trunk 14: 54:0..23 => 67:312..335, Trunk 15: 58:0..23 => 67:336..359, Trunk 16: 62:0..23 => 67:360..383 | 66:0..23 => 3:0..23 66:24..47 => 7:0..23 66:48..71 => 11:0..23 66:72..95 => 15:0..23 66:96..119 => 19:0..23 66:120..143 => 23:0..23 66:144..167 => 27:0..23 66:168..191 => 31:0..23 66:192..215 => 35:0..23 66:216..239 => 39:0..23 66:240..263 => 43:0..23 66:264..287 => 47:0..23 66:288..311 => 51:0..23 66:312..335 => 55:0..23 66:336..359 => 59:0..23 66:360..383 => 63:0..23
E1 | Trunk 1: 2:0..29 => 67:0..29, Trunk 2: 6:0..29 => 67:30..59, Trunk 3: 10:0..29 => 67:60..89, Trunk 4: 14:0..29 => 67:90..119, Trunk 5: 18:0..29 => 67:120..149, Trunk 6: 22:0..29 => 67:150..179, Trunk 7: 26:0..29 => 67:180..209, Trunk 8: 30:0..29 => 67:210..239, Trunk 9: 34:0..29 => 67:240..269, Trunk 10: 38:0..29 => 67:270..299, Trunk 11: 42:0..29 => 67:300..329, Trunk 12: 46:0..29 => 67:330..359, Trunk 13: 50:0..29 => 67:360..389, Trunk 14: 54:0..29 => 67:390..409, Trunk 15: 58:0..29 => 67:410..439, Trunk 16: 62:0..29 => 67:440..479 | 66:0..29 => 3:0..29 66:30..59 => 7:0..29 66:60..89 => 11:0..29 66:90..119 => 15:0..29 66:120..149 => 19:0..29 66:150..179 => 23:0..29 66:180..209 => 27:0..29 66:210..239 => 31:0..29 66:240..269 => 35:0..29 66:270..299 => 39:0..29 66:300..329 => 43:0..29 66:330..359 => 47:0..29 66:360..389 => 51:0..29 66:390..409 => 55:0..29 66:410..439 => 59:0..29 66:440..479 => 63:0..29