Nortel Networks 553-3001-211 manual NTAK20 Clock Controller CC daughterboard, Connector pinout

NTRB21 DTI/PRI/DCH TMDI card Page 825 of 894

Connector pinout

The connection to the external digital carrier is through a 15 position Male D-type connector.

Table 260

DS-1 line interface pinout for NTBK04 cable

From 50-pin
MDF connector	To DB-15	Signal name	Description
pin 48	pin 1	T	transmit tip to
			network
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 1000S, 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 1000S, 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. See “NTAK20 Clock Controller daughterboard” on page 723.

Circuit Card Description and Installation