ADC H4TU-C-319 List 1 Line Unit, HDSL4 user manual Gnlb Test Procedures, Mode/Sel

LTPH-UM-1031-03, Issue 3 Testing

GNLB Test Procedures

Figure 29 on page 50 is a graphical representation of the various loopback configurations with the associated GNLB commands shown. Refer to Table 16 for a description of these commands.

Table 16. Summary of HDSL4 Loopback and Activation Codes

				Method of Activation
Loopback	Code	Description	Test Set	Craft Port	MODE/SEL
NLOC	1111000	DSX-1 signal is looped back to the network at	X	X	X
	4-in-7	the H4TU-C.
NREM	1110000	DSX-1 signal is looped back to the network at	X	X	X
	3-in-7	the H4TU-R.
NDU1	110000	Signal is looped back to the network at H4D1.	X	X	X
	2-in-6
CDU1	111100	DS1 signal from customer is looped back to the	X	X	X
	4-in-6	customer at H4D1.
NDU2	111000	Signal is looped back to the network at H4D2.	X	X	X
	3-in-6
CDU2	111110	DS1 signal from customer is looped back tot he	X	X	X
	5-in-6	customer at H4D2.
D1LB		Dual loopback at H4D1.			X
D2LB		Dual loopback at H4D2.			X
CLOC	1111100	DS1 signal from the customer is looped back to	X	X	X
	5-in-7	the customer at the H4TU-R.
CREM	1111110	DS1 signal from the customer is looped back to	X	X	X
	6-in-7	the customer at the H4TU-C.
COLB		Dual loopback at the H4TU-C. DSX-1 signal is
		looped back to the network at the H4TU-C and			X
		DS1 signal from the customer is looped back to
		the customer at the H4TU-C.
RULB		Dual loopback at the H4TU-R. DSX-1 signal is
		looped back to the network at the H4TU-R and			X
		DS1 signal from the customer is looped back to
		the customer at the H4TU-R.
SMJK LpUp	11000	SmartJack Loopup or NID payload (PL) code.	X
(PL)	2-in-5	Invokes H4TU-R loopback towards network.
SMJK LpUp	1111-1111- SmartJack Loopup or NID (ESF-DL) code.		X
(ESF-DL)	0100-1000	Invokes H4TU-R loopback towards network.
SMJK LpDn	11100	SmartJack Loopdown or NID payload (PL) code.	X
(PL)	3-in-5	Removes SMJK, NLOC, NREM, CLOC, and
		CREM.
SMJK LpDn	1111-1111- SmartJack Loopdown or NID (ESF-DL) code.
(ESF-DL)	0010-0100	Removes SMJK, NLOC, NREM, CLOC, and	X

CREM.

H4TU-C-319 List 1 September 12, 2003 51