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TN-S900-A (Attenuator)
5.20 TN-S900-A (Attenuator)
5.20.1 Overview
The TN-S900-A loop attenuator is used to artificially increase the distance between the DSLAM (ATU-C) and
the Customer Premise Equipment (ATU-R). Each TN-S900-A adds approximately 2000 ft. of "cable" to the cus-
tomer loop. The attenuator is detailed in
Increasing distance, or loop length, can result in higher powered ADSL signaling, thereby reducing near end
cross talk (NEXT). Therefore, attenuating short loops, within binders of mixed-length loops, will enhance the
over-all system performance by equalizing the power output by all ports on an individual iMAP ADSL card.
25 mm
5.20.2 TN-S900-A Physical Installation
The TN-S900-A loop attenuator is installed between the interface to the telco outside plant facilities and the
ADSL modem at the subscriber's premises.
The TN-S900-A has two labels, LINE and PHONE (see
the TN-S900-A is co-located with the modem, so the pig tail of the TN-S900-A is plugged into the modem, and
the RJ-11 receptacle faces the wall jack.
Note:
If required by installation, the TN-S900-A connections can be reversed, with the pig tail
connected to the wall jack and an RJ11 cable connecting to the modem. (A telephone can be
connected in a series as well.)
5-32
Telesyn Wiring Solutions (Appendix)
Figure
50 mm
40 mm
24.2 mm
FIGURE 5-17
5-17.
100 mm
Attenuator Dimensions
Figure
5-18). For ease of installation and maintenance,
Overview
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