ADTRAN D4-OCU DP User Manual

C A U T I O N !

SUBJECT TO ELECTROSTATIC DAMAGE

OR DECREASE IN RELIABILITY.

PRACTICES

HANDLING PRECAUTIONS REQUIRED.

D4-OCU DP (ETR)

ALL-RATE OFFICE CHANNEL UNIT DATAPORT

WITH EXTENDED TRANSMIT RANGE

INSTALLATION/MAINTENANCE

CONTENTS

1. GENERAL ...................................................................1

2. INSTALLATION...........................................................2

3. CONNECTIONS..........................................................3

4. TESTING.....................................................................3

5. AUTO LOOP DISCONNECT ......................................4

6. MAINTENANCE ..........................................................4

7. WARRANTY AND CUSTOMER SERVICE ................4

FIGURES

Figure 1. ADTRAN D4-OCU DP.........................................1

Figure 2. Rate Option Switch .............................................2

Figure 3. SW1.....................................................................3

Figure 4. Connector Pin Assignments ...............................4

TABLES

Table A. SW1 Option Settings ...........................................3

SW1

Section 61107005L2-5

Issue 3, June 1996

CLEI Code # D4DA740 _ _ _

N

O

1

2 3 4 5 6 7 8 9 10

OCU DP

1107005L2

D4-OCUDP

RX (OUT)

TX (IN)

LOOP BACK

IDLE CKT

NO SX

AUTO DIS

64

56

56

38.4

38.4

19.2

19.2

SC

9.6

9.6

4.8

4.8

2.4

2.4
SW56

1. GENERAL This practice has been reissued to correct enhanced

Switch 56 references.
This practice is an installation and maintenance guide

for the ADTRAN Office Channel Unit Dataport (D4-OCU
DP) with Extended Transmit Range1 (ETR). Figure 1 is
an illustration of the unit. A detailed product description
is found in ADTRAN D4-OCU DP Description Practice,
Section 61107005L2-2.

The Office Channel Unit Dataport (OCU DP) allows
access to the Dataphone® Digital Service (DDS) or
Basic Digital Service using existing 4-wire metallic
facilities and D4 channel banks equipped for dataport
operation. In addition to this interchangeability, the
ADTRAN D4-OCU DP contains the following
enhancements:

• Extended loop range2 (45 dB receiver range
when operated at all rates)

• Intermediate rate of 19.2 kbps; special format

________________________________________

1

Covered under I.N.C. patent number 4,887,278
Dataphone is a registered trademark of AT&T

2

Covered under ADTRAN patent number 4,759,035

3

Covered under I.N.C. Patent No. 4,862,480

3

Figure 1. ADTRAN D4-OCU DP

• Switched 56 capability

• Latching and normal loopbacks

• Latching loopback capability in SW56 mode

• Loss of sealing current disconnect

• Poor loop signal quality disconnect

• Hardware signaling selection

• 45 dB range at all rates

• Faceplate Bantam jacks

• Four diagnostic faceplate indicators

• Extended transmit range

Furnished with common equipment and individual channel
units, the D4 channel bank is a digital terminal providing
multiple-channel access to T carrier lines. The dataport
is a D4-type channel unit which allows direct digital
access to a T carrier time slot, avoiding the normal
analog-to-digital conversion required in a voice channel
unit.

1Section 61107005L2-5, Issue 361107.005L2-5C

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.

SC

19.2

9.6

38.4

56

No rate selection

64

56

38.4

19.2

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.

A sixteen-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, and Secondary Channel (SC). Set the switch functions
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.

________________________________________

SLC is a registered trademark of AT&T

WECO is a registered trademark of AT&T

4.8

2.4

SW56

No rate selection

9.6

4.8

2.4

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