Nortel Circuit Card Installation Manual page 719

Table 233
DS-1 line interface pinout for NTBK04 cable (Part 2 of 2)
From 50-pin MDF
connector
pin 49
pin 24
Clock controller interface
Clock rate converter
To DB-15
pin 3
pin 11
The clock controller interface provides the recovered clock from the external
digital facility to the clock controller daughterboard through the backplane.
Depending on the equipped state of the clock controller, the clock controller
interface enables or disables the appropriate reference clock source, in
conjunction with software.
Each MG 1000S that has a digital trunk must have a clock controller
clocked to an external reference clock.
Note: Clocking slips can occur between MG 1000S systems that are
clocked from different Central Offices (COs), if the COs are not
synchronized. The slips can degrade voice quality.
The 1.5 Mb clock is generated by a Phase-Locked Loop (PLL). The PLL
synchronizes the 1.5 Mb DS1 clock to the 2.56 Mb system clock through the
common multiple of 8 kHz by using the main frame synchronization signal.
NTAK09 1.5 Mb DTI/PRI card
Signal name
T1
R1
IMPORTANT!
Circuit Card
Page 719 of 906
Description
receive tip from network
receive ring from network
Description and Installation