ADTRAN TROCU DP, DSU/CSU Preprovisioning, Installation, Testing, Cable Type Loss Data @ 13.3 kHz

In lieu of option switches, the TROCU DP Preferred Option has been preprovisioned with feature settings as indicated in Table 1.

Table 1. Preprovisioning

Feature	Setting
Latching Loopback	ON
Zero Code Suppression	ON (Unless 56 kbps, SC, and
	64 kbps = OFF)
Error Correction	OFF

3. INSTALLATION

C A U T I O N !

SUBJECT TO ELECTROSTATIC DAMAGE

OR DECREASE IN RELIABILITY.

HANDLING PRECAUTIONS REQUIRED.

The TROCU DP plugs directly into a WECO or equivalent D4 channel bank or the ADTRAN ACT 1900/2300 channel bank. No special wiring is required. The two-wire loop uses the T/R (Tip and Ring) pair, pins 24 and 51 of the D4 backplane.

Span-powering is accomplished using -130 V, measured from Tip to Ring. Voltage measured from Tip to GND should indicate approximately -130 V; voltage from Ring to GND should indicate approximately 0.0 V.

When inserted into a powered up backplane the TROCU DP and TRDDS-R will synchronize within 30 to 90 seconds. When synchronized, the SYNC LOSS indicator LED will turn Off. If synchronization cannot be achieved, check the T/R pair for an open circuit or short circuit condition, or load coils (see LED Indicators).

4. TESTING

Testing for the TROCU DP is accomplished using the same test procedures for four-wire OCU and OCU DP units. Table 2 describes cable loss for the TRDDS Nyquist frequency of 13.3 kHz.

The TROCU DP is equipped with logic level bantam test access jacks that permit testing in both directions using a portable test set. Latching and alternating OCU and CSU loopback sequences are supported. Alternating loopbacks do not operate when the 64 kbps data rate is selected. Choose NEAR to test toward the customer loop; choose FAR to test toward the T-carrier.

In the FAR direction, an OCU loopback sequence will loop the unit directly across the T-carrier system. In the NEAR direction, an OCU loopback sequence will loop the unit directly connected to the portable test set.

NOTE

If 64 kbps is selected, the unit will only respond to latching loopback sequences. Alternating sequences are not valid at this rate.

Table 2. Cable Type Loss Data @ 13.3 kHz

	Plastic Cable	dB Loss/kft		Paper Cable	dB Loss/kft
19	Gauge PIC (0F)	0.5302	19	Gauge PULP (0F)	0.5616
19	Gauge PIC (70F)	0.6083	19	Gauge PULP (70F)	0.6415
19	Gauge PIC (120F)	0.6610	19	Gauge PULP (120F)	0.6955
22	Gauge PIC (0F)	0.912	22	Gauge PULP (0F)	0.9454
22	Gauge PIC (70F)	1.0258	22	Gauge PULP (70F)	1.0606
22	Gauge PIC (120F)	1.1015	22	Gauge PULP (120F)	1.1370
24	Gauge PIC (0F)	1.2571	24	Gauge PULP (0F)	1.2900
24	Gauge PIC (70F)	1.3982	24	Gauge PULP (70F)	1.4324
24	Gauge PIC (120F)	1.4917	24	Gauge PULP (120F)	1.5268
26	Gauge PIC (0F)	1.6823	26	Gauge PULP (0F)	1.6751
26	Gauge PIC (70F)	1.8568	26	Gauge PULP (70F)	1.8469
26	Gauge PIC (120F)	1.9718	26	Gauge PULP (120F)	1.9608

61291006L2-5B Section 61291006L2, Issue 2 3