ADTRAN D4-OCU warranty Installation, Sixteen-Position Rotary Faceplate Switch

In the DDS system, an OCU DP located at an end office interfaces the customer to the T carrier system. A 4-wire loop is terminated at the customer premises by a data service unit (DSU) or a channel service unit (CSU). It can be used in the hub office, intermediate office, end office, or SLC® terminal to extend the DDS network to that office which has previously served voice channels exclusively.

The ADTRAN All-Rate Extended Range D4-OCU DP is interchangeable with the following AT&T units:

•Subrate OCU DP (J98726DB)

•56 kbps OCU DP (J98726DE)

•All Rate OCU DP (J98726DJ)

The unit is also interchangeable with all previous and current ADTRAN units including the following:

•All-Rate OCU DP (1102005A)

•All-Rate with 38.4/64 kbps OCU DP (1102006A)

•All-Rate OCU DP (1104005L9)

2.INSTALLATION

After unpacking the unit, immediately inspect it for possible shipping damage. If damage is discovered, file a claim immediately with the carrier and contact ADTRAN Customer Service (see subsection 7).

The D4-OCU DP plugs directly into a WECO®, or equivalent, D4 channel bank, ADTRAN General Purpose Communication (GPC) shelves, or ADTRAN ACT-1241 channel bank. No installation wiring is required.

Asixteen-position rotary switch on the faceplate and an internal ten-position slide switch (SW1) must be set prior to installing the unit.

Sixteen-Position Rotary Faceplate Switch

The settings for the sixteen-position rotary switch select loop rates of 2.4, 4.8, 9.6,19.2, 38.4, 56, SW56, or 64 kbps,andSecondaryChannel(SC). Settheswitchfunctions as illustrated in Figure 2.

When 64 kbps is selected, normal loopbacks are automatically disabled. Only latching loopback may be used at this rate. When SW56 is selected as the operating rate, SW1-1 must remain off.

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SLC is a registered trademark of AT&T

WECO is a registered trademark of AT&T

		No rate selection
	56	64
	38.4	56
	19.2	38.4
SC	9.6	19.2
	4.8	9.6
	2.4	4.8
		2.4

SW56

No rate selection

Shown with 9.6 kbps Secondary Channel selected. Two positions do not have rates associated with them. The D4-OCU DP will not function when these switch positions are set.

Figure 2. Rate Option Switch

Internal Switch Option Settings

The location of the ten-position slide switch is illustrated in Figure 3. The option settings are provided in Table B. SW1 is a ten-position slide switch which enables or disables error correction, bank type, zero code suppression, latching loopback, hardware A/B signaling, quality monitoring, and extended transmit range.

If more than one bank type is selected (on), the OCU DP will not function.

There are restrictions in the deployment of 38.4, 56, and 64 kbps with error correction in a D4 bank. When the dataport is configured for no error correction, a single timeslot is used and the unit may be located in any channel slot of the D4 bank. With 38.4, 56 and 64 kbps error correction selected, the dataport generates a parity byte for each data byte, thus occupying two timeslots. If the standard D4 38.4, 56 and 64 kbps error correction option is selected, the parity byte is inserted into the timeslot immediately following the data. The specific design of the D4 common equipment interacts with the error correcting schemes and yields the following deployment restrictions on a 38.4, 56 and 64 kbps dataport with error correction:

a. All D4 Modes: Dataport may not be located in channel slot 24.

b. D4 Modes 1, 2: Data and parity must be confined to groups of six channel slots (i.e., slots 1-6, 7-12, 13-18, or 19-24.)

2 Section 61107005L2-5, Issue 3 61107.005L2-5C