Functional Description - Nortel Circuit Card Installation Manual

Page 198 of 906

Functional description

Figure 30
Lineside T1 card – block diagram
Front
panel
LEDs
Card slot
addresses
Backplane
Async card
LAN link
Controller
Tx PCM
card
Rx PCM
Slot 1
Motherboard
(16 channels)
+8.5 V dc
Power
supplies
553-3001-211 Standard 3.00
NT5D11 and NT5D14 Lineside T1 Interface cards
"Man-Machine T1 maintenance interface software" on
information on T1 link maintenance. If the card detects that tests are being run
or that alarms have been disabled through the MMI, this LED will light and
will remain lit until these conditions are no longer detected, then it will turn
off.
Figure 30 shows a block diagram of the major functions contained on the
lineside T1 card. Each of these functions is described on the following pages.
Micro-
controller
Card LAN
interface
DS-30X
interface
Digital
Gain/Loss
Pads
Slot 2
Daughterboard
(8 channels)
Reg +5 V dc logic power
August 2005
T1 Interface
(One for all
24 channels)
Line interface unit power
Mux
Seq.
page 225 for
Man/Machine Interface
External Alarm Interface
T1 Tx Tip
Backplane
T1 Tx Ring
Common
Peripheral
T1 Rx Tip
Equipment
T1 Rx Ring
connector
553-6476