ADTRAN T200 IDSL warranty Installation

Quality Monitor (QM)

When QM (SW1-2) is ON, the IDSL OCU-R monitors the customer interface for errors. If excessive errors are detected the unit blocks customer data transmission and sends Abnormal Station Code to the network. Customer data transmission is automatically restored when the trouble condition is cleared.

Error Correction (EC)

When EC (SW1-3) is ON, the unit enables the appropriate technique to ensure data integrity across the digital network.

Latching Loopback Enabled (LLEN)

When LLEN (SW1-4) is ON, the IDSL OCU-R will respond to latching loopback sequences.

False Loopback Immunity

ADTRAN’s Protected Loopback family of channel units include an algorithm compatible with SARTS, Hekimian, TPI, and other test systems that virtually eliminates false latching loopback occurrences. This algorithm is always enabled at 64 kbps. In addition, ADTRAN’s Protected Loopback family features a Protected Loopback mode for further false latching loopback protection.

Latching Loopback

During operation up to 56 kbps, with LLEN enabled (SW1-4 ON), the IDSL OCU-R will respond to the legacy OCU latching loopback sequences and translates CSU latching loopback sequences to the DSU/CSU per TR62310 and ANSI T1.417. With LLEN OFF, the IDSL OCU-R will not respond to latching loopback.

At 64 kbps the function of the LLEN switch is altered. At 64 kbps, placing LLEN ON will permit the IDSL OCU-R to respond to the legacy latching loopback sequence per TR62310 and ANSI T1.417. At 64 kbps, with LLEN OFF, the IDSL OCU-R enables ADTRAN’s Protected Loopback.

Protected Loopback

ADTRAN’s Protected Loopback supports the new proposed DDS latching loopback standard in T1E1.2/ 99-007R1. When enabled, the IDSL OCU-R will respond to latching loopback when the idle code preamble is sent prior to the latching loopback sequence specified in TR62310 and ANSI T1.417. See Table 2 for the latching loopback sequence requirement when Protected Loopback is enabled.

Table 2. Protected Loopback Mode

Requirement T1E1.2/99-007R1 (Latching

Loopback)

Sequence	Byte Code		# of Received
Function			Bytes
Exit data	Idle - 11111110		Minimum of
protocol			35 Idle bytes
Clear existing	Transition in		Minimum of
loopbacks	progress (TIP)		35 TIP bytes
	X0111010
Identify device	Loopback select		Minimum of
to be looped	code (LSC)		35 LSC bytes
	X0000101	- DS0
	X1010101	- OCU
	X0110001	- CSU
Prepare to loop;	Loopback		Minimum of
send MAP code	enabled (LBE)		100 LBE bytes
after 30 bytes	X1010110
Activate	Far-End voice		Minimum of
loopback	(FEV)		32 FEV bytes
	X1011010

Minimum of 35 TIP bytes required to disable established latching loopback.

X = Don't care bit

3. INSTALLATION

C A U T I O N !

SUBJECT TO ELECTROSTATIC DAMAGE

OR DECREASE IN RELIABILITY.

HANDLING PRECAUTIONS REQUIRED.

After unpacking the unit, inspect it for damage. If damage is noted, file a claim with the carrier, then contact ADTRAN. See Warranty and Customer Service.

WARNING

•Never install telephone wiring during a lightning storm.

•Never install telephone jacks in wet locations unless the jack is specifically designed for wet locations.

•Never touch uninsulated telephone wires or terminals unless the telephone line has been disconnected at the network interface.

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