Nortel Networks 1000 - Manual (Page 799)

Architecture 799
the clock controller. The secondary reference is obtained from another 2
Mbps DTI card, which is designated by a craft person. No other clocks
originating from other 2MB DTI packs are used.
The clock controller provides an external timing interface and is capable
of accepting two signals as timing references. In this case, an external
reference refers to an auxiliary timing source which is bridged from a traffic
carrying signal. This is not intended to be a dedicated non-traffic bearing
timing signal. The clock controller uses either the two external/auxiliary
references or the 2MB DTI references.
The 2MB DTI card has the necessary hardware for routing its reference to
the appropriate line on the backplane
Software is responsible for the distribution of the secondary references and
ensures that no contention is present on the REFCLK1 backplane line.
Software designates the 2MB DTI Card as a primary reference source to
the clock controller. The secondary reference is obtained from another 2
Mbps DTI card, which is designated by a craft person. No other clocks
originating from other 2MB DTI packs are used.
The clock controller provides an external timing interface and is capable
of accepting two signals as timing references. In this case, an external
reference refers to an auxiliary timing source which is bridged from a traffic
carrying signal. This is not intended to be a dedicated non-traffic bearing
timing signal. The clock controller uses either the two external/auxiliary
references or the 2MB DTI references.
See “Reference clock selection through software” (page 851) .
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.
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.
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 333 "2 MB DTI switch options" (page 800) .
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 02.06 Standard
27 August 2008
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