Nortel DMS-100 Series Maintenance Manual page 65

NTTR66AA EMI filter card
The NTTR66AA electromagnetic interference (EMI) filter card is at the
bottom of the TSS. There are four EMI filter cards installed to support 64
lines. Each EMI filter card is
• a voice frequency (VF) filter card that attenuates high frequency signals
from the voice frequency lines
• an EMI common mode filter for 16 line card pairs
• an EMI filter for the DS-1 links to the TSS
The EMI cards provide filtering for the following line cards
• EMI card 0 filters line cards 0-15 in lower line subgroup
• EMI card 1 filters line cards 16-31 in lower line subgroup
• EMI card 2 filters line cards 0-15 in upper line subgroup
• EMI card 3 filters line cards 16-31 in upper line subgroup
Note: All 16 lines connected to the EMI card are taken out of service when
the EMI card is removed.
NTTR67AA dc panel
The NTTR67AA dc panel receives power from the ac/dc rectifier and from
batteries. The dc panel
• distributes the main -48 V to the
— NTTR72AA power supply
— LTU
— fans
• provides the talk battery filter and fuse
• controls the battery voltage protection
• houses the
— -48 V, 10 A main power circuit breaker
— talk battery filters
— power test points
— fuses
– .50 A auxiliary fuse for customer equipment
– .50 A LTU fuse (for FMT6 use 1.3A)
– .50 A fans and heaters fuse
– 5 A talk battery filter fuse
DMS-100 Family NA100 Star Remote System XPM15 and up
Star Remote System hardware 2-45