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Framing and Coding on T1 (RBS)
The framing and Coding applies to all the channels on the T1. The options in Framing are D4 superframe (JB7)
or Extended Superframe (ESF). See page 110. The Coding options are AMI (Alternate Mark Inversion) or B8ZS
(Bipolar with 8 Zero Substitution). See page110. The default settings are D4 and AMI.
Changes to the Framing or Coding only take effect when the switch is reset. If you go on hook at
the programming position after changing the settings, the switch will automatically reset. You
can also reset the switch by pressing the reset button.
Line Build Out
The Line build out applies all the channels on the T1 and can be set at 0 dB, -7.5 dB, -15 dB and -22.5 dB. The
default setting is -7.5 dB. The setting depends on how far it is to the first repeater on the span. The programming
is described on page 111.
Changes to the Line Build Out only take effect when the switch is reset. If you go on hook at the
programming position after changing the setting, the switch will automatically reset. You can
also reset the switch by pressing the reset button.
Line Gain
The Line Gain can be adjusted for each channel. If calls on a particular channel or channels are giving an echo
then the gain should be adjusted down to reduce it. There are three settings provided, low (-9 dB), medium
(-6dB) and high (-3dB). The default setting is high. See the programming on page 113.
Low is the recommended receive setting as specified in EIA 464C. Medium is the recommended value in EIA
464B.
DTMF or Pulse dialing
Each T1 channel can be set to be either DTMF or Pulse dialing. The default is that DTMF dialing is set. See the
programming on page 113.
Received Digits
On T1 channels programmed with ANI or DNIS the switch does not know how many digits it is likely to receive.
In order to speed up the call processing the number of digits that will be received is programmed. It is set at 2 in
default. See page 113.
If *ANI* or *DNIS* is available then the programming is ignores as the
digit stream.
Programming the number of channels on a T1 s pan
The programming of the number of T1 channels available on the switch is programmed in the Equipped Lines
programming. See page 101. The T1 circuits are shown as Lines 1 - 24. The switch can also be equipped with up
to 4 CO Lines. These are always numbered Lines 25-28.
Installation and Maintenance Manual
s indicate the beginning and end of the
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