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TC12 General Handbook

666/HB/43100/000 Page 5-2 Issue 9

EPS41 - Either Two or Four wire presentation

BT Analogue Multi point Standard - Either Two or Four wire presentation

EPS42 - Either Two or Four wire presentation, better quality

BT Analogue Multi point Premier - Either Two or Four wire presentation

The OTUs may be attached to the line in radial, multidrop or multipoint format:-

Radial:- One OTU per telephone line. Only 2-wire can be used.

Multi-point:- One ITU telephone line is split by BT so that there is one telephone

line per OTU. 2 or 4-wire can be used.

Multi-drop:- Several OTUs per telephone line with all but the terminating OTU

set to high impedance. 2 or 4-wire can be used.

The OTU can terminate the leased line with either 600 Ohms or high impedance. The high

impedance setting is only used in Multi-drop configuration on all OTUs but the furthest on the line.

5.1.4 Number of OTUs per Line

The number of OTUs attached to one line depends on:

a) the baud rate,

b) the amount of control data sent

c) the amount of reply data returned.

Table 2 to Table 7 show the numbers of OTUs it is possible to attach to each line, assuming all

OTUs on one line are configured to receive the same number of control bytes and return the same

number of reply bytes. Table 1 shows the total number of bytes that can be sent down one Modem

line.

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Siemens TC12 Guía de usuario Pagina 22