H.100 Bus Timeslot Mapping

SCSA Compatibility Mode

There are 1024 timeslots available on the H.100 for transmitting and receiving data. The PCI/H.100 EXNET Connect transmits over a maximum of 16 E1 logical spans (512 channels) or 21 T1 spans (504 channels). It internally maps logical span/channels to H.100 timeslots depending on the physical span offsets by the host. Timeslots 0 - 511 are reserved for PCI/H.100 to transmit to voice processing resources over the H.100 bus. Timeslots 512 — 1023 are available for the other H.100 bus resources to transmit data.

Also, EXNET Connect logically pairs transmit and receive Timeslots offset by 512 into full duplex channels. For example, Timeslot 0 (transmit) is paired with Timeslot 512 (receive) to make up Channel 0, Timeslot 1 is paired with Timeslot 513 to make up Channel 1, etc. EXNET Connect logically groups channels into spans to establish connections based on span/channel assignments.

Example

T1 Logical Spans

Channels 0-23 = Span 0, Channels 24-47 = Span 1, etc.

E1 Logical Spans

Channels 0-31 = Span 0, Channels 32-63 = Span 1, etc.

The EXNET Connect driven timeslots and the voice resource-driven timeslots have a one-to-one correspondence, offset by 512. For example, timeslots 0 and 512 create a logical full duplex channel (span 0, channel 0). Figure 12-1 illustrates this relationship.

Figure 12-1 H.100 Bus Logical Channel Mapping (SCSA Compatibility Mode)

Table 12-1 Transmit and Receive (SCSA Compatibility Mode)

H.100 Bus

EXNET Connect XMIT

EXNET Connect XMIT

Voice Resources XMIT

Voice Resources XMIT

 

Timeslots

E1 Span

E1 Channel

T1 Span

T1 Channel

E1 Span

E1 Channel

T1 Span

T1 Channel

0

0

0

0

0

RCV

RCV

RCV

RCV

:

:

:

:

:

RCV

RCV

RCV

RCV

3

0

3

0

3

RCV

RCV

RCV

RCV

:

:

:

:

:

RCV

RCV

RCV

RCV

:

:

:

:

:

RCV

RCV

RCV

RCV

31

0

31

1

7

RCV

RCV

RCV

RCV

32

1

0

1

8

RCV

RCV

RCV

RCV

:

:

:

:

:

RCV

RCV

RCV

RCV

63

1

31

2

:

RCV

RCV

RCV

RCV

:

:

:

:

:

RCV

RCV

RCV

RCV

510

15

30

Not used

Not used

RCV

RCV

Not used

Not used

511

15

31

Not used

Not used

RCV

RCV

Not used

Not used

512

RCV

RCV

RCV

RCV

0

0

0

0

:

:

:

:

:

:

:

:

:

Timeslots

E1 Span

E1 Channel

T1 Span

T1 Channel

E1 Span

E1 Channel

T1 Span

T1 Channel

543

RCV

RCV

RCV

RCV

0

31

1

7

:

:

:

:

:

:

:

:

:

547

RCV

RCV

RCV

RCV

1

3

1

11

:

:

:

:

:

:

:

:

:

576

RCV

RCV

RCV

RCV

2

0

2

16

:

RCV

RCV

RCV

RCV

:

:

:

:

1023

RCV

RCV

Not used

Not used

15

31

Not used

Not used