NTAK10 2.0 Mb DTI card Page 721 of 894

Reference clock interface

The recovered clock derived from the facility is available on the MDF connector. The signals at these connectors conform to the electrical characteristics of the EIA RS-422 standard.

Switch settings

Various 2MB DTI switch options exist on the NTAK10. These are shown in Table 231.

Table 231

2 MB DTI switch options

 

Off

On

Switch

(Switch Open)

(Switch Closed)

 

 

 

S1-1

—

—

 

 

 

S1-2

CC Enabled

CC Disabled

 

 

 

S2-1

120 ohms

75 ohms

 

 

 

S2-2

75 ohms

120 ohms

 

 

 

S3-1

non-French Firmware

French Firmware

 

 

 

S3-2

—

—

 

 

 

Note: The ON position for all the switches is toward the bottom of the card. This is indicated by a white dot printed on the board next to the bottom left corner of each individual switch.

Circuit Card Description and Installation

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Nortel Networks 553-3001-211 manual Switch settings, Reference clock interface
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