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2 Section 61245201L1-5, Issue 3 61245201L1-5C
With the exception of the physical dimensions of the
units, the FNID and T200 FNID units are functionally
identical. The FNID terminates local loop DSL
signals originating from the Central Office (CO) unit
and transforms the DSL signal into fractional T1
signals to be delivered to the customer.
The DSL local loop operates over a single twisted
pair. The FNID communicates over the twisted pair
to the FT1 DP (ADTRAN part numbers 1242040L1,
1242046LX, 1242047LX, 1242048LX, 1245205L1,
1245206L1, 1245207L1, 1245208L1) located at the
CO. The payload between FT1 DP and FNID is
programmable from the faceplate 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. The FNID delivers
a standard ANSI T1.403 interface to the customer
equipment at 1.544 Mbps. The extra bandwidth is
nulled out in the form of idle stuffed channels.
2. INSTALLATION
C A U T I O N !
SUBJECT TO ELECTROSTATIC DAMAGE
OR DECREASE IN RELIABILITY.
HANDLING PRECAUTIONS REQUIRED.
After unpacking the unit, immediately inspect it for
possible shipping damage. If damage is discovered,
file a claim immediately with the carrier, then contact
ADTRAN Customer Service (see subsection 10 of this
practice).
FNID Option Selections: Configuration strap P1
selects FNID settings. Figure 2 illustrates P1 location
and options.
P1 selects DS1 Tx attenuation to the customer. It is
selectable between 0dB and -15dB.
Provisioning options (selecting B8ZS/AMI or SF/
ESF) are automatically controlled on the FNID when
selected at the FT1 DP.
The settings on the FT1 DP are encoded and
transmitted to the FNID once the circuit has achieved
synchronization.
Front Panel Indicators: There are five status
indicators on the front panel. See Table A for a
description of these indicators.
Figure 2. FNID Option Switch Locations
P1
o
o
o
P1
o
o
o