Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
5.5.3.7.5 ROBBED BIT SIGNALING SELECT WINDOW
The Robbed Bit Signaling Select window applies to T1 systems only and is shown in Figure 5-26.
Select “Port 1’ in the Port select box. To enable RBS in a particular time slot, the appropriate box must
be checked. Any combination of boxes can be checked or unchecked according to your system
requirements. The RBS window must be setup for each timeslot (TS1 through TS24) and for each port
(Port 1 through Port 8) as required.
After all eleven Tab windows have been programmed, select “All Pages” at the lower left of this
window. Then click on “Write” at the bottom of the window. This will cause NMS to write all the
configuration settings into the DACS module and then read back the configurations.
To look at the DACS module status, click on the “Status” radio button, then select “All Pages”, and
then click on “Read”. This will cause NMS to retrieve all current system status information from the
DACS module.
When “This Page” is selected after clicking on the “Read” or “Write” button, the current page will
display the actual value in the DACS module. The Read button just reads the DACS module settings
or status. The Write button “Writes” the settings to the DACS module and then reads the settings back.
NOTE
Robbed bit signaling (typically used to pass information such as onhook/offhook, ring, etc)
requires special handling by the DACS module. RBS “robs” an LSB (least significant bit)
data bit from every sixth frame of data. Due to the frame alignment process in the DACS
module, the transmit data stream may require the RBS data to be inserted in different frames
(still in every sixth frame). This process is unavoidable and is not of concern on voice
channels where RBS signaling is typically used. However, it will corrupt digital data traffic
in the DS0.
For this reason, only DS0s identified by the user as containing RBS signaling should be
configured to pass the RBS data. This is accomplished by the user specifying which receive
ports contain RBS signals. The DACS module then automatically determines which transmit
DS0s must contain RBS based upon the DS0 maps.
M-DACS-T1 RFL Electronics Inc.
February 28, 2006 5-41 (973) 334-3100
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