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Long Haul Mode (-36db)
Setting the receive sensitivity to Long Haul Mode means the MultiAccess receiver expects the size of the
incoming signal to be between -10db and -36db. If the incoming signal is smaller than -36 dB, the interface will
not be able to recover it and will indicate a Red Alarm condition. If the incoming signal is greater than -10 dB,
depending on many variables (wave shape, jitter, dB level, cable quality, EMI, etc) erratic communication, bit
errors and other problems may or may not result.
FXS Signaling Method
This parameter only applies (and is made available) when the Line Type is set to T1-RBS and selects the
specific RBS method of signaling. Your choices are; E&M Wink Start, E&M Immediate Start, Ground Start and
Loop Start.
T1 lines implementing RBS signaling use the state of the AB bits to determine and establish Call Progress.
The state of the AB bits (00 or 01 or 10 or 11) take on different meanings when this parameter changes. For
example, when set to E&M Immediate Start 00 means idle (on hook) but when set to Loop Start 01 means idle.
The Loop Start and Ground Start protocols implement an FXO to FXS relationship. Equipment at one end must
be in FXO mode while the equipment at the other end must be in FXS mode. The MultiAccess performs FXS
side operation only, so the Central Office equipment (or private PBX type equipment on your premise) at the
other end of the T1 link must be set to FXO. FXS verses FXO does not apply when the signaling protocol is
E&M.
For Example:
If you're connecting the MultiAccess to a T1 line from Telco and their central office switch is set to
FXO-Loop Start and the MultiAccess is set to FXS-Ground Start, the call signaling will fail because they
are not using the same protocol (both need to be Ground Start or both need to be Loop Start).
If You're connecting the MultiAccess to a T1 line that comes from a PBX system on your premise and it's
set to FXS-Loop Start and the MultiAccess is also set to FXS-Loop Start, the call signaling will fail because
they are not maintaining the FXO to FXS relationship.
Line Build Out (LBO)
This layer 1 parameter dictates the physical size (decibel level) of the T1 signal being transmitted by the
MultiAccess. Your choices are 0dB, -7.5dB, -15 dB & -22.5 dB. 0dB is the largest size signal the MultiAccess
can transmit.
There are a number of variables as to when the Line Build Out setting should be changed. The primary factors
are, cable length, gauge and quality (twists per inch and shielding), and what size signal does the equipment
opposite to the MultiAccess want to receive from the MultiAccess. As the signal travels down the cable it
attenuates (becomes smaller and it's wave shape starts to change) - what size will it be at the other end of the
cable?
If the receiving equipment (for example a T1 card in a PBX on your premise) is connected to the MultiAccess
with a 6 foot cable, having the MultiAccess transmit at 0dB may be too hot (too large) of a signal for that device
to receive, so setting the Line Build Out to -15dB may be more appropriate.
Remote (Yellow) Alarm Format
This parameter only applies (and is made available) when the Line Type is set to T1. This option dictates what
pattern is transmitted when the MultiAccess is to send a Yellow Alarm signal. This also dictates what pattern is
detected (looked for) in the incoming (recovered) T1 signal. The default format is a 16 bit pattern of 8 ones
followed by 8 zeros, which is sent in the Facility Data Link channel of an ESF framed T1 signal. When the
framing format is set to F12 (D4 Super Frame), this option should be set to the pattern of "bit2 in every channel
= zero".
Wink Times (High, Pre & After)
Wink times only apply and become changeable when the Line Type is set to T1-RBS and the FXS Signaling
method is set to E&M Wink Start.
MultiAccess Communications Server MA30120 User Guide
Chapter 3 – Software
Line Interfaces > Line x
Setup>
T1RBS
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