Nortel Networks Circuit Card - Manual (Page 743)

NTAK20 Clock Controller daughterboard Page 743 of 906
Circuit Card Description and Installation
backplane line. It designates the DTI/PRI motherboard as a primary reference
source. The secondary reference is obtained from another DTI/PRI card,
which is designated by a technician. No other clock sources are used.
External timing interface
The clock controller provides an external timing interface and accepts two
signals as timing references. An external reference is an auxiliary timing
clock which is bridged from a traffic carrying signal and is not intended to be
a dedicated non-traffic-bearing timing signal. The clock controller uses either
the external/auxiliary references or the DTI/PRI references.
Hardware integrity and regulatory environment
The clock controller complies with the following hardware integrity and
regulatory specifications:
Item Specification
EMI FCC part 15 sub- part J
CSA C108.8
CISPR publication 22
ESD IEC 801-2
Temperature IEC 68-2-1
IEC 68-2-2
IEC 68-2-14
Humidity IEC 68-2-3
Vibration/Shock IEC 68-2-6
IEC 68-2-7
IEC 68-2-29
IEC 68-2-31
IEC 68-2-32