Section SDSĆ548Ć6LNĆ204
030Ć101328 Rev. A
R
0208I4RA
2
S
Automatic 4Ćtone alignment capability; Auto Align is
activated via a frontĆpanel TEST switch during the first
five minutes of initial powerĆup or via command mode by
sending 1804 Hz to INTELIPORT.
S
Automatically adjusts amplitude response characteristics
(up to 15.3 dB, referenced at 1004 Hz) to meet C5 condiĆ
tioning requirements.
S
Unit identification tone (alternating 1014 Hz/414 Hz)
identifies unit being accessed for maintenance testing as
INTELIPORT.
S
Remotely adjustable XMT OUT Level setting in 0.5 dB
(gain/loss) increments.
S
FullĆrange transponder operation (300 to 3200 Hz) with
quiet termination permits remote testing of noise and
tone level measurements at TLP or DLP.
S
FrontĆpanel TEST switch used to activate INTELIĆ
PORT's wire test mode for verifying station wiring.
S
Sealing current Supply/Off/Term operation.
S
NonĆvolatile memory retains programmed information in
the event of power loss.
S
Mounts in one position of a Westell Type 550 (TypeĆ400
equivalent) or 200 Mechanics
r
mounting.
S
Operates from Ć22 to Ć56 Vdc at 95 mA maximum or
from 20 to 28 Vac at 115 mA maximum.
S
7Ćyear warranty.
2.
APPLICATIONS
The SDS5486LN provides an interface between a 4Ćwire facility
and a 600Ćohm 2W or 4W data modem. The SDS5486LN is norĆ
mally located on the same premises as the modem. The integral
microprocessor circuit controls all functions of the unit. The preĆ
cision oscillator circuit generates test tones during testing and
alignment.
2.1
Command Mode
INTELIPORT incorporates a command mode from which all
functions except manual and toneĆactivation of the loopback cirĆ
cuit are accessed. The command mode is the operational state
in which INTELIPORT monitors its transmission paths for inĆ
coming frequencies and interprets these frequencies as
commands to carry out specific functions. The command mode
is activated from the STC by sending 2713Hz for more than 30
seconds. INTELIPORT responds by sending 1014Hz indicating
command mode initiation. If the tone is present for more than
2.0 seconds but less than 30 seconds, INTELIPORT sends a
1Ćsecond alternating tone of 1014Hz/414Hz and enters the loopĆ
back mode of operation.
2.2
XMT OUT Level Adjust
The operating levels for Westell's SDS5486LN are given in
Table 1. The Transmit Out level can be remotely adjusted to acĆ
commodate any level from +7 to Ć16 dBm. The XMT OUT level
can be adjusted by adding either gain or loss in 0.5dB increments
or can be set to achieve a Ć16 dBm level (see paragraphs 3.13 thru
3.16).
PORT
LEVELS (IN DBM)
PORT
TLP
DLP
RCV IN
+5 to Ć10
Ć8 to Ć23
RCV OUT
Ć3
Ć16
XMT IN
+13
0
XMT OUT
+5
Ć8
*The XMT OUT level can be remotely adjusted for any level from +7 to Ć16 dBM (TLP) or Ć6 to
Ć29 dBM (DLP)
Table 1. Operating Levels
2.3Alignment (Remote and Automatic)
The SDS5486LN features both remote and automatic alignment
capability.
2.3.1 Remote Alignment
The Serving Test Center (STC) can align the circuit to either
three tones or four tones.
Ć NOTE Ć
FourĆtone alignment allows a more accurate alignment when inĆ
terfacing long sections of loaded cable or a mixture of loaded and
nonĆloaded cable facilities.
2.3.2 Automatic 4Ćtone Alignment
AutoĆAlign is activated from onĆsite via the frontĆpanel TEST
switch, during the first five minutes of initial powerĆup. AutoĆ
Align is also activated via the command mode by sending 1804
Hz to INTELIPORT.
3.
CIRCUIT/FUNCTIONAL OPERATION
Refer to Figure 2, SDS5486LN (Issue 4) Block Diagram.
3.1
LED Status Indicators
INTELIPORT has six, frontĆpanel LEDs that provide a quick
visual indication of the units status and mode. Table 2 provides
a brief summary of the LED functions.
