Specifications

Chapter 1 Installation
1-16
(Megacom
R
) and Calling Party Disconnect (1 &2) Also used as
Private Line Automatic Ringdown (PLARD)
4 Off Off On E&M immediate start to Ground Start Conversion with ringback to
T1 (Megacom
R
)(1)
5 On Off On Wink Start ANI/DNIS to Loop Start Conversion with 800 ms Wink
Delay and Calling Party Disconnect (1,2,3)
6 Off On On Wink Start ANI/DNIS to Ground Start conversion with 800 ms
Wink Delay (1,3)
7 On On On Custom Signaling Options:
Please contact Carrier Access Corporation.
Options 5, 6 & 7 not available in release 1 or 2.
1. Loop Release implemented to prevent follow-on calls until the network A/B clears(no timer)
2. Calling Party Disconnect implemented as a 2 second tip open when the network A/B clears.
3. Wink-out is provided after loop answer, instead of after network seizure. This is the key difference
between options 1&2 to 5 & 6.
FXS Transmission Options - Gain/Loss Settings
Transmission gain options are configured with one 6-Position DIP switch block for each channel.
Transhybrid balance (impedance matching looking out of the Access Bank Tip and Ring) is adjusted
automatically by the Access Bank FXS circuits to provide excellent line balancing for a wide range of
PBXs, Key Systems, telephones, and long-line conditions. 600 to 1200 ohm resistive and complex
impedance Tip and Ring terminations are provided with an automatic line build-out compensation in
Access Bank electronics. A compromise impedance of 900 ohms + 2.16 uF is provided as a terminating
impedance by the Access Bank (looking into the Access Bank Tip and Ring). FXS transmission
performance supports high speed modems and fax machines.
Transmission Loss DIP Switch Blocks 1 through 12
Six-position DIP switches control the voice level on a per-channel basis. These switches are located on
each FXS channel card and there is one switch for each channel. Three switches set the transmit gain and
three switches set the receive gain in each group. Channel one is in the lower left hand corner when the
LED lights are facing down and the switches are facing toward you.
Receive Loss (from the T1 to the FXS interface) - Factory setting is -6dB
Receive loss is nominally 0 dB with switches 1 thru 3 on. Each switch can add loss to
obtain a total of -2, -3, -4, -5, -6, -7 or -9 dB receive loss as follows:
Switch Level OFF ON
1 -2dB Add Loss No Change
2 -3dB Add Loss No Change
3 -4dB Add Loss No Change
Transmit Loss (from the FXS interface to the T1 line) - Factory setting is -3dB