NTRB21DTI/PRI/DCH TMDI card Page465 of 544
Option11C and 11C Mini TechnicalReference Guide
Connector pinout
The connection to the external digital carrier is via a 15 position Male D type
connector.
NTAK20 Clock Controller (CC) daughterboard Digital Trunking requires synchronized clocking so that a shift in one clock
source will result in an equivalent shift of the same size and direction in all
parts of the network. On Option 11C systems, synchronization is
accomplished with the NTAK20 clock controller circuit card.The Clock
Controller circuitry synchronizes the Option 11C to an external reference
clock, and generates and distributes the clock to the system. Option 11C can
function either as a slave to an external clock or as a clocking master. The
NTAK20AA version of the clock controller meets AT&T Stratum 3 and Bell
Canada Node Category D specifications. The NTAK20BA version meets
CCITT stratum 4 spe cifications. See “NTAK20 clock controller” on
page503.
Table 1 46
DS-1 line interface pinout for NTBK04 cable
From 50-pin
MDF connector To DB- 15 Signal
name Description
pin 48 pin 1 Ttransmit tip to network
pin 23 pin 9 Rtransmit 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
IMPORTANT
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
Option11C cabinet. A cabinet that has a digital trunk must have a
clock controller.