Pots Line Drawer (Nt6X05Aa) - Nortel DMS-100 Series Maintenance Manual

2-22 Star Remote System hardware

POTS line drawer (NT6X05AA)

Each line drawer connects up to 64 line cards, one for each analog subscriber
line serviced by the Star Hub. The 64 line cards divide into two groups of 32.
Each group of 32 line cards is a line subgroup (LSG).
The maximum number of lines (1152) that can connect to a Star Hub is derived
from the number of line drawers (18) times the number of line cards for each
drawer (64).
The Star Hub connects from 2 to 16 DS-1 C-side links to its 1152 subscriber
lines. The Star Hub has a minimum of two DS-1 links because each primary
link carries one message channel to the LTC+, LGC+, or RCC2. Each DS-1
link carries 24 speech channels, making a possible of 48 to 384 available
channels, two of which are always nailed up to the host controller. Other ports
of up to a total of 16 ports can be accommodated, depending on traffic capacity
and the concentration ratio required.
Each POTS line drawer (NT6X05) in the Star Hub has one bus interface card
(BIC) and a maximum of 64 line cards of various types. The line drawer can
be removed from the frame to access line cards, yet remain operating because
of flexible cables connected to the receptacles in the back of the line drawer.
The following figure shows the layout of the POTS line drawer and the location
and numbering of line cards and the line subgroup arrangements.
297-8353-550 Standard 05.01 March 2001