aculab MC3 Installation Manual - Page 5

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1.2

Overview of clock modes on the MC3 PCI card

The MC3 PCI card supports all the clock modes required by its MC3 and H.100 ports.

At MC3 :

•

master timing on ring 1 and ring 2

•

slave timing from ring 1

•

slave timing from ring 2

At H.100 :

•

master timing on A clocks

•

master timing on B clocks

•

primary master clock fallback

•

slave timing from A clocks

•

slave timing from B clocks

Typically, in single-host CTI systems, there is at least one digital trunk connection to the PSTN.

To ensure properly synchronous operation, timing for every card in such a CTI system must be

derived from the PSTN. One digital trunk interface is selected to supply a reference clock to the

whole system. This digital trunk interface is the H.100 clock master for the host system.

An MC3 ring network is a multiple single-host CTI system. The requirement for synchronous

operation now dictates that only one node is chosen as MC3 clock master. All other nodes are

MC3 clock slaves.

The MC3 clock master node will contain :

•

an MC3 interface card operating as H.100 clock slave and connected to the MC3 ring as

MC3 clock master

•

a digital trunk interface card connected to the PSTN and operating as H.100 clock master

Please contact Aculab for details of our E1, T1, J1, PRI and BRI digital trunk card products.

Each MC3 clock slave node will contain :

•

an MC3 interface card connected to the MC3 ring as MC3 clock slave and operating as

H.100 clock master

When MC3 PCI is operating as H.100 clock master at a node it must source its timing from the

MC3 ring — it must slave timing from either ring 1 or ring 2.

Conversely, when MC3 PCI is operating as MC3 clock master at a node it must source its timing

from H.100 — it must slave timing from either A clocks or B clocks.

MC3 PCI includes a local oscillator that can be selected as the source of timing for MC3 systems

that do not connect to the PSTN.

1.3

MC3 PCI card Host Interface

The behaviour of the card is controlled by a device driver program running on the host

computer.

MC3 PCI Card Installation Guide