ADTRAN 3192 H4TU-C Range Limits 26 Gauge / 70ºF / PIC, Recommended Maximum, Attenuation Limits

HDSL4 TROUBLESHOOTING GUIDE

PRICING AND AVAILABILITY 800.827.0807 TECHNICAL SUPPORT 800.726.8663 RETURN FOR REPAIR 256.963.8722 www.adtran.com 61222404L1-22D

ADTRAN HDSL4 equipment is designed with troubleshooting-at-a-glance features. The following information provides suggestions for troubleshooting as a result of LED indications which are indicative of loop trouble.

NOTE: Pressing “ESC” while on any screen will go back to the previous screen.

LOOPBACK AND CONTROL CODES

INDICATIONS AND POSSIBLE CAUSES

DSL LED Red

Connect a terminal or PC to the RS-232 (DB-9) craft interface on the front panel. The terminal must be VT100 or compatible and set for 1.2 to 19.2 kbps, 8 data bits, no parity, 1 stop bit, no flow control. Select “3” from the ADTRAN HDSL4 Main Menu screen and “1” from the Span Status Screen. Verify the following conditions on the HDSL4 and T1 Detailed Status Screen:

■Margin ≥ 3 dB

■Attenuation ≤ 35 dB (1st segment) Attenuation ≤ 31 dB (2nd segment)

■No ES, SES, or UAS (Performance History Screen, Main Menu Selection 5)

If the above conditions do exist, the circuit should provide quality service; however, if any of the above conditions do not exist, a cable problem or excessive loss situation is probable, and more detailed cable testing should be done to verify all HDSL4 loop specifications are met. These conditions may also reflect intermittent cable faults or excessive noise impairments. If intermittent faults or noise impairments are suspected, review the Performance History Screen.

HDSL4 DEPLOYMENT GUIDELINES

NOTE: The insertion loss reading shown on the Detailed Status

The guidelines provided below apply to the segments of an	Screen is an approximation that is valid for some loops.
HDSL4 circuit, as follows:
	Exercise caution when using this value.
1st segment = between the H4TU-C and H4R
2nd segment = between two H4Rs or single H4R and H4TU-R
3rd segment = between the second H4R and the H4TU-R

These deployment guidelines provide the basics for HDSL4 circuit provisioning. If these parameters are met, then the circuit will provide quality service. If not, a cable problem or excessive loss situation is probable. In this case, a more detailed cable analysis is required to ensure that all HDSL4 loop specifications are met. These conditions may also be the result of intermittent cable faults or intermittent noise impairments. If intermittent problems are suspected, utilize the Performance History screen to assist in troubleshooting.

1.	All loops are nonloaded only		Range Limits: 26 Gauge / 70ºF / PIC
2.	Any single bridged tap is limited to 2 kft.			Recommended Maximum
				(DSL Assistant Green Zone)
3.	Total bridged tap length is limited to 2.5 kft.
			1st segment		10.8 kft.
4.	Bridge tap within 1000 feet of units may affect performance of the
			2nd/3rd segment		10.55 kft.
	circuit
5.	Margin ≥ 6 dB (Detailed Status Screen)		Range Limits: 24 Gauge / 70ºF / PIC
6.	No ES, SES, or UAS (Performance History Screen)			Recommended Maximum
7.	Foreign Voltage DC (t-r, t-g, r-g) < 3 VDC			(DSL Assistant Green Zone)
8.	Insulation Resistance (t-r, r-g, t-g) > 3.5 MΩ		1st segment		15.25 kft.
9.	Impulse Noise ≤ –40 dBmF (measured with an F filter)		2nd/3rd segment		15.05 kft.
10. Wideband Noise ≤ –54 dBmF
				Attenuation Limits
11. Longitudinal Noise (Power Influence) < 80 dBrnC		OK
				Recommended Maximum
	80–90 dBrnc	Marginal
				(DSL Assistant Green Zone)
	> 90 dBrnc	Unacceptable
				Upstream	Downstream
			1st segment	31 dB	33 dB
			2nd/3rd segment	30 dB	30 dB

Pattern	Description	Requires Arming?
1in3	Loop down all units and disarm.		No
2in5	Arming Pattern, H4TU-R will loop up if Smartjack LB is enabled.		No
3in5	Disarm and loop down all units. Restores LB TMO after D5D6.		No
1in6	Network Arming Pattern. If Smartjack LB is enabled, HTU-R will loop toward network.		No
2in6	H4R LB to Network.		No
3in6	H4R LB to Network.		No
4in6	H4R LB to Customer.		No
5in6	H4R LB to Customer.		No
3in7	H4TU-R LB to Network.		No
4in7	H4TU-C LB to Network.		No
5in7	H4TU-R LB to Customer.		No
6in7	H4TU-C LB to Customer.		No
3F1E	H4TU-C LB to Customer.		No
3F02	H4TU-R LB to Customer.		No
3F04	H4R LB to Customer.		No
3F06	H4R LB to Customer.		No
6767	Disable span powering while present.		Yes
9393	Loop down H4TU-C, Repeaters - all loopbacks. Loop down H4TU-R - Cust LB always.
	Will only loop down H4TU-R Network LB if NIU is disabled. Does not disarm units if they
	are armed.		No
C741	H4R #1 loop up pattern.	10 bit error injection.	Yes
C742	H4TU-R loop up pattern.	20 bit error injection.	Yes
C754	H4R #2 loop up pattern.	200 bit error injection.	Yes
D3D3	H4TU-C loop up pattern.	231 bit error injection.	Yes
D5D5	Query Loopback Pattern (error injection)
	H4TU-C: 231 Errors, H4R #1: 10 Errors, H4R #2: 200 Errors, H4TU-R: 20 Errors		No
D5D6	Loopback Timeout Override: Disables LB timeout. Restores original LB timeout when unit
	is disarmed.		Yes
FF48	FDL Arming Pattern (ESF only). Arms all units, H4TU-R will LB to Network if NIU Enabled
	(if pattern sources at network).		No
FF24	FDL Disarm Pattern (ESF only). Loop down and disarm all units		No
FF1E	H4TU-C LB to Network. Will not loop up H4TU-C if H4TU-C already in LB to Customer.		No
FF02	H4TU-R LB to Network. Will not loop up H4TU-R if any unit already in LB to Customer.		No
FF04	H4R LB to Network.		No
FF06	H4R LB to Network.		No

WARRANTY

ADTRAN will replace or repair this product within the warranty period if it does not meet its published specifications or fails while in service. Warranty information can be found at www.adtran.com/warranty. U.S. and Canada customer Faxback: 877-457-5007, Document 414.

NOTE: In three segment circuits (two H4Rs), individual segment resistance values must be verified. Refer to the HDSL4 Deployment Guidelines section of the Installation and Maintenance Practice (P/N 61222404L1-5x) for those guidelines.