Nortel Networks Circuit Card - Manual (Page 733)

NTAK10 2.0 Mb DTI card Page 733 of 906
Circuit Card Description and Installation
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 — —