MT8985 datasheet(9/18 Pages) MITEL

9 / 18 page

MT8985

2-53

Figure 8a - Private Isochronous Network

Access to

Public

Network

Analog Connections

• • • • • •

ISDN Desktops

n x 64

Connections

(e.g. Video)

Isochronous Network

Server 1

Server 2

Server 3

Server 4

• • • • • •

T1/E1

(2B+D)

predictable

data

transfer

delays

that

can

implemented at a reasonable cost. The Low Latency

Isochronous Network is one of the alternatives that

system designers have chosen to accommodate this

requirement (see Figure 8a). This network can be

implemented using existing TDM transmission media

devices such as ISDN Basic (S or U) and Primary

rates trunks (T1 and CEPT) to transport mixed voice

and data signals in grouped time slots; for example,

2B channels in case of ISDN S or U interfaces or up

to 32 channels in case of a CEPT link.

Figure 8b shows a more detailed conﬁguration

whereby several PCs are connected to form an

Isochronous network. Several services can be

interconnected within a single PC chassis through

the standardized Multi Vendor Integration Protocol

(MVIP). Such an interface allows the distribution and

interconnection of services like voice mail, integrated

voice response, voice recognition, LAN gateways,

key systems, fax servers, video cards, etc.

The information being exchanged between cards

through the MVIP interface on every computer as

well as between computers through T1 or CEPT links

is, in general, of mixed type where 64Kb/s and

N*64Kb/s channels are grouped together. When

such a mixed type of data is transferred between

cards within one chassis or from one computer to

another, the sequence integrity of the concatenated

channels has to be maintained. The MT8985 device

suits this application and can be used to form a

complete non-blocking switch matrix of 512 channels

(see Figure 9).

This allows

8 pairs of ST-BUS

streams to be dedicated to the MVIP side whereas

the remaining 8 pairs are used for local ancilliary

functions in typical dual T1/E1 interface applications

(Figure 10).

Another application of the MT8985 in an MVIP

environment is to build an ISDN S-interface card

(Figure 11). In this card, 7 pairs of ST-BUS streams

are connected to the MVIP interface while the

remaining pair is reserved for the interconnection of

MITEL MT8930 (SNIC), MT8992 (H-PHONE) and

the MVIP interface.

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