Instruction manual

Total Access 850 System Manual Section 4 User Interface Guide
64203376L1-1B © 2004 ADTRAN, Inc. 201
FXS Interface Setup Instructions
Step Action
1
From the main menu, select INTERFACES.
2
Highlight the CONFIG menu for the FXS interface and press <ENTER>.
3
Right arrow to select MODE and choose LOOP START, GROUND START,
T
ANDEM (E&M), TR08 SINGLE, TR08 UVG, or DPO.
This mode should be set based on the network configuration and the
operation of each FXS port. All FXS ports are independent and do not
need to have the same mode.
4
Set the TX (dB) or transmit direction level for each port. The default
value is recommended.
5
Set the RX (dB) or received direction level for each port. The default
value is recommended.
6 Set the SVC MODE to IN SERVICE to activate the port.
7
Set the LINE Z (line impedance) of each port based on the size of the
network. The default value is recommended.
8
Set the MSG IND to DISABLE or ENABLE. When set to ENABLE, talk path is
always open, even in on-hook conditions, in order for FXS message
tones to pass through. Disabling this feature will allow higher on-hook
voltage but will not allow on-hook messaging other than caller ID.
9
Configure the on-hook battery voltage using the BATT MODE field. For
most IAD installs, the FXS loop is short with 6 to 7 V present on tip / ring.
To reduce power dissipated during off-hook conditions, the battery is
lowered for short loop lengths. When set to A
UTO SWITCH, the IAD uses
a higher on-hook battery voltage (48-52 V). When off-hook, it
automatically switches to low battery (24-26 V) to minimize power
dissipation. When set to L
OW BATTERY mode, the higher battery is not
used and the voltage is a constant 26 V even while on-hook. The tip/ring
voltage is reduced to 26 V when using the L
OW BATTERY mode.
10
Specify the interval of battery removal during a forward disconnect state
using the FWD DISC TIMER field. Choices are FOLLOW SWITCH (default),
500
MS, 750MS, 1000MS, and 2000MS. When using ATM mode, there is
an additional choice of I
GNORE SWITCH. If the timer is set to FOLLOW
S
WITCH, the
Total Access 850 will follow the switch at all times; this is normal
operation. If a time period has been selected, the Total Access 850 will
remove battery for the specified time period OR as long as the switch
requests battery removal, whichever is longer. For example, if the timer
expires but the switch continues to request battery removal, the Total
Access 850 will follow the switch and continue to remove battery. For
ATM mode, if the timer is set to I
GNORE SWITCH, the IAD will never
remove battery.