MT9079AC datasheet(42/54 Pages) MITEL

42 / 54 page

MT9079

4-278

location. The BPV counter is cleared by writing zero

to location 1DH first and then writing zero to location

1CH of page 4.

The interrupt vector byte is then cleared by reading

it.

This step ensures that interrupts that occurred

when the interface was not initialized will be cleared

before the MT9079 IRQ output is activated. The IRQ

output function is activated by making SPND low.

TAIS is now made high, which indicates to the far

end of the link that this end is functional.

It should be noted that Figure 12 is an initialization

example and does not imply that there is a rigid

sequence that must be followed.

PCM 30 Trunk and Timing Interface

Figure 13 shows the MT9079 connection to a generic

Line

Interface

Unit

(LIU).

The

LIU

has

three

functions: 1) it converts the framed transmit signal to

the required PCM 30 pseudo-ternary signal; 2) it

converts the received PCM 30 pseudo-ternary signal

to a binary signal; and c) it extracts a data clock form

the receive PCM 30 signal.

order

meet

network

requirements,

necessary to control the transmit equalization of the

LIU (EC1 - EC3). This pre-emphasizes the transmit

pulse shape so it can fit within a standard pulse

template at a specific point on the transmit link.

When using a LIU that clocks data in and out with

separate signals, the MT9079 remote loopback can

allow bit errors to occur. This is because the MT9079

does not re-time the looped signal, so phase

differences in the C2 and RCLK clock signals will

impact the transmit data. This problem can be

prevented by implementing the remote loopback in

the LIU and controlling it from a port. Performing the

remote loopback in the LIU also more closely

adheres to network requirements, which state that a

remote loopback should be implemented as close to

the PCM 30 side of the trunk as possible.

Figure 13 - PCM 30 Line Interface Unit (LIU)

Figure 14 - Common Channel Signalling Control (Time Slot 16) through the MC68302

Voice/Data Bus

DSTi

DSTo

F0i

C4i/C2i

E2i

TxA

TxB

RxA

RxB

MT9079

EC3

EC2

EC1

RLOOP

TCLK

Control

Port

LIU

RCLK

E1 Transmit

Trunk

Interface

E1 Receive

E8ko

System Timing

MT8980D

STon

STin

CSTo

DTA

C4i

MT9079

DSTi

DSTo

C4i/C2i

TxA

TxB

RxA

RxB

E2i

To Trunk Interface

MT8980

µP Interface

MT9079

µP Interface

MC68302

+5V

909

Ω

Address

Data

Control

100

Ω

100

Ω

MT9079AC Datasheet(PDF) 42 Page - Mitel Networks Corporation

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