ADC H4TU-C-319 List 1 Line Unit, HDSL4 user manual OCT55 Test Pattern with AMI Line Code

LTPH-UM-1031-03, Issue 3 Testing

Remote LOS and AIS Response

Figure 27 shows the different ways the H4TU-R can respond to the network, depending on the configuration of the NLBP, TLOS, RDA, and ALMP configuration options described in Table 5 on page 19 and Table 6 on page 20.

H4TU-R, DS1 Input

AIS

AIS to CPE

LOS event?	YES	NLBP	LOS to CPE
			LOS
NO	TLOS	ENA	Loopback to Network
	DIS
		DIS	Pass on LOS to
	RDA		Network, no alarm
			report

ENA

Remove alarm	NO	AIS event?	YES
pattern

	ALMP	LOS	Pass on LOS to
Standard Option			Network
ADC Option	AIS
Default configurations are in bold.
			AIS to Network

Figure 27. H4TU-R LOS and AIS Response Priorities

OCT55 TEST PATTERN WITH AMI LINE CODE

The OCT 55 test pattern can be used in unframed mode to stress the system and verify data integrity. In an SF or ESF framing mode, excessive zero anomalies may occur, which causes the H4TU-C to report ES, SES, and UAS errors according to ANSI T1.231-1997.

H4TU-C-319 List 1 September 12, 2003 45