Avaya 1000 Series, Reference

Page: 660 / 700

From 50-pin MDF
connector
To DB-15 Signal name Description
pin 23 pin 9 R transmit ring to
network
pin 25 pin 2 FGND frame ground
pin 49 pin 3 T1 receive tip from
network
pin 24 pin 11 R1 receive ring from
network
NTAK20 Clock Controller (CC) daughterboard
Digital Trunking requires synchronized clocking so that a shift in one clock source results in an
equivalent shift of the same size and direction in all parts of the network.
The NTAK20 clock controller circuitry synchronizes the CS 1000E, CS 1000M Cabinet, and
Meridian 1 PBX 11C Cabinet to an external reference clock and generates and distributes the
clock to the system. The CS 1000E, CS 1000M Cabinet, and Meridian 1 PBX 11C Cabinet can
function either as a slave to an external clock or as a clocking master to the network.
The NTAK20AD and NTAK20AA versions of the clock controller meet AT&T Stratum 3 and Bell
Canada Node Category D specifications. The NTAK20BD and NTAK20BA versions meet
CCITT stratum 4 specifications.
NTAK20 Clock Controller daughterboard on page 513
Important:
Each Media Gateway that has a digital trunk must use a clock controller clocked to an
external reference clock.
If an IP Expansion multi-cabinet system is equipped with digital trunk cards, it is mandatory
that at least one trunk card is placed in the Main Option 11C cabinet. A cabinet that has a
digital trunk must use a clock controller.
Note:
Clocking slips can occur between systems that are clocked from different COs, if the COs
are not synchronized. The slips can degrade voice quality.
On CS 1000 systems, synchronization is accomplished with the NTAK20 clock controller circuit
card. The clock controller circuitry synchronizes the CS 1000 to an external reference clock
and generates and distributes the clock to the system. The CS 1000 can function either as a
slave to an external clock or as a clocking master to the network.
NTRB21 DTI/PRI/DCH TMDI card
660 Circuit Card Reference July 2011
Comments? infodev@avaya.com