CTC Union TRM01, Руководство пользователя

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Chapter 3. Data Modules
13
TRM-01 APR 2000
3.1 Data Module Overview
The Data Modules for the TRM-01 are FT1 (fractional T1) Cards which
slide into the TRM-01 chassis, and interface with the pack panel “main board”.
The back panel provides an interface connection to the FT1 cards for power,
T1 connection, data port connection and control logic (for optional SNMP/local
management terminal). The cards are designed to be “hot” swappable, meaning
the
TRM-01 chassis need not be powered off in order to replace a card or pull it
for configuration setting. Each FT1 Card has a protection fuse and its own on
card DC-DC regulator. Each FT1 Card in the TRM-01 receives the DC buss
48VDC and uses its own on-card DC to DC converter to derive the required
operating voltage of 5VDC. Removal and installation of
FT1 cards with the
rack chassis under power will not effect the operation of other FT1 cards . The
one exception to this would be a case where the improper fuse (rated too high)
were placed on a defective
FT1 card , causing the main AC or DC power
module's fuse(s) to open. It should also be noted, that the FT1 cards themselves
have no redundancy. Therefore, if a card is pulled from the chassis while the
communication link is active, the link will be broken.
Removal of an FT1 Card is accomplished by loosing the two (2) captive
screws on the face plate of the card module, and then pulling the card straight
out of the chassis with the same screws. Apply equal pulling force to both top
and bottom captive screws to avoid the card binding in the rails of the chassis.
(refer to Figure 3-1) Replace the card by reversing the procedure, align in the
slot groove and gently seat the card. Retighten the captive screws.
Figure 3-1 : Removal/Replacement of FT1 Card in TRM-01 Chassis
Captive
Screws
TRM-01
Chassis
Card
Rails
Interface
Connector
FT1 Card
Configuration
DIP Switches