Nortel Networks Circuit Card User Manual
Page 570 of 906
NT8D14 Universal Trunk card
Functional description
Figure 114 shows a block diagram of the major functions contained on the
NT8D14 Universal Trunk card. Each of these functions is described on the
following pages.
NT8D14 Universal Trunk card. Each of these functions is described on the
following pages.
Figure 114
NT8D14 Universal trunk card – block diagram
NT8D14 Universal trunk card – block diagram
Input/output
interface
control
Codec
PCM
Micro-
controller
DS-30X
interface
5.12 MHz
clock
Tx PCM
Async card
LAN link
Front
panel
LED
Card LAN
interface
Analog
hybrid
XFMR
Tip
Signaling
relays
Analog
trunk facilities
(CO/FX/WATS,
DID, tie, RAN,
or paging)
Trunk interface units 0–3
Signal
detection
Signal
hybrid
Ring
*
*
*
Analog
hybrid
XFMR
Tip
Signaling
relays
Analog
trunk facilities
(CO/FX/WATS,
DID, tie, RAN,
or paging)
Trunk interface units 4–7
Signal
detection
Signal
hybrid
Ring
*
*
*
Codec
PCM
Rx PCM
1 kHz
frame sync
Card slot
address
Back-
plane
Con-
troller
card
Trunk
signaling
interface
Control
logic
Signaling
and status
Address/
data bus
data bus
*
Signaling
lines for
RAN or
paging
control
lines for
RAN or
paging
control
553-CSE6197