Functional Description - Nortel Circuit Card Installation Manual

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Functional description

Figure 114
NT8D14 Universal trunk card – block diagram
Input/output
interface
control
Front
panel
LED
Micro-
controller
Card slot
Back-
address
plane
Card LAN
interface
Async card
LAN link
Tx PCM
Rx PCM
Con-
troller
card
5.12 MHz
interface
clock
1 kHz
frame sync
553-3001-211 Standard 3.00
NT8D14 Universal Trunk card
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.
PCM
Address/
data bus
PCM
DS-30X
Signaling
and status
Control
logic
August 2005
Trunk interface units 0–3
Codec
detection
Trunk interface units 4–7
Codec
detection
Trunk
signaling
interface
Analog
XFMR
Tip
hybrid
Ring
Signaling
relays
*
*
Signal Signal
hybrid
Analog
XFMR
Tip
hybrid
Ring
Signaling
relays
*
*
Signal Signal
hybrid
Analog
trunk facilities
(CO/FX/WATS,
DID, tie, RAN,
or paging)
Analog
trunk facilities
(CO/FX/WATS,
DID, tie, RAN,
or paging)
*
Signaling
lines for
RAN or
paging
control
553-CSE6197