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Section 61180405L1-5, Issue 1
61180405L1-5A
C A U T I O N
C A U T I O N !
SUBJECT TO ELECTROSTATIC DAMAGE
OR DECREASE IN RELIABILITY.
HANDLING PRECAUTIONS REQUIRED.
The FT1 Digital Subscriber Loop local loop operates
as an independent subsystem over a single twisted
pair. The Total Access 1500 FT1 DP communicates
over this twisted pair to the following Fractional
Network Interface Devices:
Part Number
Description
1242041LX ....................... Circuit Pack
1242042LX ....................... Standalone
1245201LX ....................... Circuit Pack
1242050L2 ........................ FT1 Repeater
1245211L1 ........................ FT1 Repeater
The payload between Total Access 1500 FT1 DP and
FNID is programmable from the front panel rotary
switch as follows:
2 channels (minimum).............. 128 kbps
3 channels ................................. 192 kbps
4 channels ................................. 256 kbps
5 channels ................................. 320 kbps
6 channels ................................. 384 kbps
7 channels ................................. 448 kbps
8 channels ................................. 512 kbps
9 channels ................................. 576 kbps
10 channels ............................... 640 kbps
11 channels ............................... 704 kbps
12 channels (maximum)........... 768 kbps
The system carries a small amount of overhead used
for maintenance and performance monitoring related
functions.
To take advantage of all available features, the FT1
DP should be paired with the FT1 Repeater P/N
1245211L1 and the FNID P/N 1245201L2. The FTI
DP is also compatible with other ADTRAN FNIDS.
2. INSTALLATION
After unpacking the unit, inspect it for damage. If
damage is noted, file a claim with the carrier, then
contact ADTRAN. See
Warranty and Customer
Service
.
The unit occupies two slots in a standard Total Access
1500 housing. No installation wiring is required.
The bandwidth is taken by the Total Access 1500 FT1
DP in contiguous time slots. These slots must not be
previously assigned to other channel cards plugged
into the Total Access 1500 shelf.
The FT1 will not wrap around the channels at the end
of the channel bank. For example, if
n
is equal to 4
channels and the FT1 DP is plugged into slot 23 of the
channel bank, then only channels 23 and 24 can be
used, not channels 1 and 2.
If it is the first FT1 DP installed in the Total Access
1500 shelf, the FT1 DP will take approximately 20
seconds to communicate with the shelf common cards.
This is indicated by the LEDs turning on one at a time
in succession from bottom to top, then repeating.
How the Total Access 1500 shelf assigns time slots to
the FT1 DP is determined by the type of LIU installed
in the shelf. If it is a single T1 LIU, the normal
assignment is one DS0 channel per physical slot. If it
is a dual LIU, two DS0 channels per physical slot are
assigned. If it is a quad LIU, four DS0 channels per
physical slot are assigned. In order for the Total
Access 1500 shelf to automatically assign time slots to
the FT1 DP, one or more physical slots to the
immediate right of the FT1 DP may need to be empty.
For example, assume a quad LIU is installed and the
FT1 DP is set for 12 channels. If the FT1 DP is
installed in slot 2 (occupying slots 2 and 3, then the
next slot (4) should be empty so there will be no
conflict. In this case, the FT1 DP will be assigned to
T1-A slots 5-16.
