Nortel Networks Circuit Card Manual De Usuario

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 NTAK10 2.0 Mb DTI card
 Page 733 of 906
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 236.
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.
Table 236
2 MB DTI switch options
Switch
Off
(Switch Open)
On
(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