ADTRAN DSU/CSU Options, Features, A/B Signaling, Quality Monitor, Line Code, Sealing Current

NOTE

Do not use in SLC-96 Mode II unless unit is provisioned through Digital System-6.

2. OPTIONS

Select the appropriate OPTIONS and RATE using SW1 and faceplate switches as illustrated in Figure 3 and Figure 4.

NOTE

The TROCU DP must be used with an appropriate TRDDS-R unit.

Features

In addition to operation over extended ranges the TROCU DP incorporates or supports the following:

CAUTION

Select only one option rate. Rate is selected on faceplate switch SW2 by pushing one or two switches to the right toward the inscribed rates. If either SW56 or 64 is selected, the secondary channel (SC) switch may not be selected.

•Two-wire deployment.

•Repeaterless operation.

•Bridged tap tolerant

•Span power for remote TRDDS-R termination unit.

•Utilization in all D4 channel bank and SLC-96 Mode I or III remote terminal applications.

•NEAR and FAR logic level bantam test access.

A/B Signaling

When A/B Signaling (SW1-1) is OFF, the unit derives signaling from the incoming data stream. When A/B signaling is ON, the unit determines the state of the A and B signaling bits using signals present on the backplane of the channel bank. This method assumes that proper signaling has been maintained throughout network tandems and cross connect systems.

•Loop Quality Monitor and A/B signaling options.

•Embedded Digital System 6 capabilities for remote provisioning, configuration, and performance monitoring.

NOTE

A/B option is only applicable when SW56 is selected; otherwise the option is a “don’t care.”

Quality Monitor

Line Code		When Quality Monitor (SW1-2) is ON, the unit
The ADTRAN TRDDS incorporates Simple Coded-		monitors the incoming two-wire loop and four-wire
Pulse Amplitude Modulation (SC PAM), a line code		customer interface data for errors. If excessive errors
that reduces the bandwidth needed to transport signals		are detected, the unit blocks customer data
over copper loops. The Power Spectrum Density		transmission and sends Abnormal Station Code to the
(PSD) of SC PAM complies with Basic Rate Interface		network. Customer data transmission is automatically
(BRI) PSD mask as specified in ANSI T1.601 and is		restored when the trouble condition is cleared. The
below allowable 2B1Q PSD levels. SC PAM		Quality Monitor feature is recommended for use on
increases the deployment ranges and allowable		multipoint circuits.
bridged tap lengths when compared to AMI and
2B1Q. Additionally, SC PAM has an improved
spectral compatibility when compared to AMI and
2B1Q.					8	SC
					7	64
Sealing Current					6	56
The TROCU DP provides a constant 10 mA sealing		SW1	ON		5	19.2
		OFF	1	A/B Signaling	3 4	9.6
current to the TRDDS-R. With 10 mA sealing current
						4.8
		OFF		Quality Monitor
and span power of -130 Vdc, ADTRAN’s TRDDS			2			2.4
					2
system is in the A3 Class as specified in Bellcore					1	SW56
TR-NWT-001089, Standard for Electrical Safety for					ON
Network Telecommunications Equipment.		Figure 3.		Option	Figure 4. Rate
			Switch
					Selection
2	Section 61291006L2, Issue 2				61291006L2-5B