Advertisement
This device complies with part 15 of the FCC rules.
Operation is subject to the following two conditions:
(1) This device may cause harmful interference, and
(2) this device must accept any interference that may
cause undesired operation.
Changes or modifications not made expressly by
ADTRAN could void the user's authority to operate
this equipment.
2. INSTALLATION
HANDLING PRECAUTIONS REQUIRED.
After unpacking the unit, inspect it for damage. If
damage is noted, file a claim with the carrier, then
contact ADTRAN Customer Service.
The Quad FXO inserts into any slot, even or odd 1
through 6, of the TA 750, TA 850 or TA 1500 chassis.
To install the Quad FXO, hold the unit by the
faceplate while supporting the bottom side. Align the
card edges to the guide grooves for the designated
slot. Insert the card until the edge connector seats
firmly into the backplane. Lock the unit in place by
pushing in on the locking lever.
Telecommunications Codes
The table below shows the Telecommunications
Codes for the Total Access 750/850/1500 QUAD FXS
Access Module. The Total Access 750/850/1500
QUAD FXS Access Module is intended to be
installed in restricted access locations only (must be
installed in TA 750/850/1500 only) and in equipment
with a Type 'B' or 'E' installation code.
Code
Input
IC
TC
PC
2
Figure 2. FXO to FXS Deployment
C A U T I O N !
SUBJECT TO ELECTROSTATIC DAMAGE
OR DECREASE IN RELIABILITY.
Output
A
–
–
X
C
C
Section 61175407L1-5, Issue 2
3. OPTIONS
There are no hardware options on the Quad FXO
access module. The module has factory default
settings for each of the four analog interfaces on the
module. The DB-9 VT 100 craft interface on the
TA 750 BCU, TA 850 RCU or TA 1500 SCU is used
if any other settings or provisioning options are
desired. The factory default setting for the QUAD
FXO interfaces are as follows:
•
FXO Mode.
•
Loop start signaling.
Setting Attenuation With Known TLP
For applications where input and output Transmit
Level Points are known, the transmit and receive
attentuation levels can be calculated to ensure
optimum VF characteristics. This is defined in
®
AT&T
Publication 43801 which explains that the
value of the digital signal at reference point TLP0
should be equal to 0 dBm0, or a digital milliwatt for
optimum performance (proper volume heard through
the telephone). Refer to Figure 3 which displays the
TLP reference points (input, output, TLP0) and
attenuation parameters.
TRANSMIT ATTENUATION
Determine the input TLP. Then use the following
formula to calculate the amount of transmit
attenuation to add to the circuit:
Tx Attenuation = Input TLP
Transmit Path (To Backplane)
0 to +9 dB
Input TLP
Point
T
R
-9 to 0 dB
Output TLP
Receive Path (From Backplane)
Point
Figure 3. Circuit Path
Tx Atten
0 dBm0
0 to -9 dB
TLP0
Rx Atten
0 dBm0
0 to -9 dB
TLP0
61175407L1-5B
Advertisement
