MT89726 Просмотр технического описания (PDF) - Mitel Networks

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производитель

MT89726

MT8972 Loop Extender Circuits

Mitel Networks 

MH89726/728

Advance Information

MH89726 (160 kbit/s)

CONFIGURATION

CABLE

24 AWG

(8.0 dB/km at 120 kHz)

26 AWG

(11.5 dB/km at 120 kHz)

DNIC to DNIC

0.0 to 4.1 km

0.0 to 3.0 km

DNIC with LEC to DNIC with LEC

0.65 to 5.1 km

0.5 to 3.6 km

Table 1 - Typical Transmission Performance at 160 kbit/s

MH89728 (80 kbit/s)

CONFIGURATION

CABLE

24 AWG

(6.9 dB/km at 60 kHz (Note 1)

26 AWG

(10.0 dB/km at 60 kHz)

DNIC to DNIC

0.0 to 5.2 km

0.0 to 3.4 km

DNIC with LEC to DNIC and LEC

0.9 to 6.5 km

0.65 to 4.1 km

Table 2 - Typical Transmission Performance at 80 kbit/s

Note 1: The attenuation of the cable as specified by Bell System Technical Reference PUB 62411.

MT8972

LOUT 1

+5V

D1

LIN 21

D2

80 kbit/s RA = 390Ω CA = 22nF CB = 3.3nF

CB

160 kbit/s RA = 390Ω CA = 22nF CB = 1.5nF

RA

CA

LEIN

LOOP

EXTENDER

and

Network

Termination

LEOUT1

LEOUT2

2:1

1.0µF

Twisted Pair

Copper 24-26

Gauge

0.33µF

NOTES:

-D1, D2 IN5817 (Schottky)

-Solid jumpers used to connect the loop extender

-Dotted jumpers connect MT8972 without loop extender

Figure 4 - Typical Application of the Loop Extender

9-130

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