H.100 Bus Timeslot Mapping

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.

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). H.100 Bus Logical Channel Mapping (SCSA Compatibility Mode) illustrates this relationship.

See Signal Computing System Architecture.

Peripheral Component Interconnect

Excel's open architecture, proprietary, 1.3 Gbps fiber optic network using a packet-based protocol.

A digital communications link - voice, data, and video at a 2.048 Mbps rate; 30B/2D or 31B/1D (ISDN); non-North American version of T1.

Digital communications link - voice, data, and video at a 1.544 Mbps rate (24 64 Kbps channels)

Range of channels provided by T1 or E1 transmission service. A physical span is a group of channels taking up a single physical wire. A logical span is a group of channels taking up less than a single logical wire, or carried over more than one physical wire.

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