ADTRAN TRDDS-R Electrical Code Compliance, Pin, UL/CUL Telecommunications Codes, Signal Meter

The unit should be wired as follows:

¥Network pair to terminal strip TT and TR positions

¥To Customer and From Customer pairs through customer 8-pin modular connector

or

To Customer (DRT, DRR) and From Customer (DTT, DTR) to designated terminal strip positions

Electrical Code Compliance

Table 2 shows the UL/CUL Telecommunications Codes for the TRDDS-R. The TRDDS-R complies with the requirements covered under UL 1459 third edition and is intended to be installed in an enclosure with an Installation Code (IC) of ÒBÓ or ÒEÓ. The TRDDS-R is intended for installation in restricted access locations only.

No rate selection is necessary for the TRDDS-R. The unit automatically adapts to the service rate of the Total Reach dataport in the Central Office (CO).

		TRDDS-R
		1	11	Frame Ground
		17	27
To	(TT)	41	55	(DTT)	From
	(TR)			(DTR)
Network		47	49		Customer
			5	(DRT)	To
			15	(DRR)	Customer

Figure 4. Circuit Card Pin Assignments

Table 1. Wiring Connections

	Terminal	T400	Customer
Pair	Strip	Pin
			RJ48
	Designations	Number
To/From	TT, TR	41, 47
Network
To	DRT, DRR	5, 15	7, 8
Customer
(Rx)
From	DTR, DTT	49, 55	1, 2
Customer
(Tx)

Table 2. UL/CUL Telecommunications Codes

	INPUT	OUTPUT
IC	A	-
TC	X	X
PC	C	C

Display Indicators

The TRDDS-R contains faceplate-mounted LED indicators which display the operating status and service rate. The indicators are described in Table 3.

Signal Meter

The TRDDS-R contains a signal meter that approximates the amount of dB loss on the TRDDS loop at 13.3 kHz (135 Ω termination), the Nyquist frequency of TRDDS. The signal meter on the TRDDS-R may be used to verify that the loop loss is actually within TRDDS deployment guidelines without the requirement of peripheral test equipment. The signal meter is activated automatically upon power up during the TRDDS training sequence and remains activated until synchronization occurs (usually

30-90 seconds after power-up). For example, if the signal meter only illuminates the 2.4 LED, then the loop loss is too great for TRDDS deployment. If the signal meter illuminates 2.4 and 4.8 (only two LEDs), then the TRDDS loop loss is between 50 and 56 dB and the loop is considered marginal for TRDDS deployment. If three or more rate LEDs are illuminated during TRDDS train-up, then the circuit is considered to be within TRDDS deployment guidelines. See Figure 5 for a translation of the signal meter loss ranges in dB. If the loop loss indicates a marginal loop for TRDDS deployment, then a more precise loop loss measurement can be made with the appropriate test equipment.

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