66
Crosspoints
Overview of Crosspoints
NV8140
An NV8140 has slots for two normal crosspoint cards and a redundant crosspoint card. Both
crosspoint cards and the redundant crosspoint card receive all inputs. The redundant crosspoint
card is in stand-by mode; it does nothing unless one of the normal crosspoints fails.
The active crosspoint cards send their outputs to the output cards.
If fail-over is automatic and an active card fails, the NV8140’s control card causes the redundant
card to take over for the failed active card. When the redundant card becomes active, it sends its
outputs to the output cards.
The redundant crosspoint is installed in the middle crosspoint slot:
NV8280
In an NV8280, the router’s switching matrix is distributed across 8 crosspoint cards. Each card
switches a specific subset of the inputs or outputs. Crosspoint cards are installed in crosspoint
slots 1–4 and 7–10. The optional redundant crosspoint module is installed in slots 5 and 6:
Fig. 3-1: NV8280 (Front View)
FAN
INPUTS
1144
(8 cards)
SEC. CONTROL
PRIM. CONTROL
(16 cards)
RED. XPT
XPT
B
POWER SUPPLY
POWER SUPPLY
OUTPUTS
1288
XPT
A
Inputs 1–144 are received by crosspoint
cards A and B.
Crosspoint card A distributes the upper 9
outputs of all the output cards. (Those are
outputs 1–9, 19–27, and so on.)
Crosspoint card B distributes the lower 9
outputs of all the output cards. (Those are
outputs 10–18, 28–36, and so on.)
INPUTS 145288
INPUTS 145288
INPUTS 1144
INPUTS 1144
INPUTS 1144
INPUTS 1144
FAN
INPUTS
1144
INPUT MONITOR
(16 cards)
OUTPUTS
1288
OUTPUTS
289576
OUTPUT MONITOR
(16 cards)
INPUTS
145288
(16 cards)
SECONDARY CONTROL
CROSSPOINT CARDS
INPUTS 145288
INPUTS 145288
REDUNDANT CROSSPOINT
(16 cards)
OUTPUTS 289576
1
2
3
4
7
8
9
10
5, 6
OUTPUTS 1288
PRIMARY CONTROL
Inputs 1–144 are received by
crosspoint cards 1, 2, 7, and 8.
Inputs 145–288 are received by
crosspoint cards 3, 4, 9, and 10.
Outputs 1–288 are distributed
by crosspoint cards 1–4.
Outputs 289–576 are distributed
by crosspoint cards 7–10.
Содержание NV8500 Series
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Страница 16: ...xvi Table of Contents ...
Страница 124: ...108 Expanded NV8576 Plus Connecting the NV8576 Plus Frames ...
Страница 134: ...118 Alarms Making Alarm Connections ...
Страница 150: ...134 Power Connecting to Power ...
Страница 161: ...145 NV8500 Series User s Guide Network Page Time Page ...
Страница 204: ...188 M3 Cards M3 Cable and Connectors ...
Страница 216: ...200 Maintenance Obtaining Service ...
Страница 228: ...212 IP Gateway Specifications ...
Страница 236: ...220 Frame Expansion ...
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