You are here: CSP Developer’s Guide: Overview > 12 EXNET Connect Card > 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 |