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DESCRIPTION

The Total Access 1500 Dual Nx56/64 is a DSU data 
port with two circuits that each deliver T1 data over 
a V.35 interface. The unit is designed specifically for 
the Total Access 1500 chassis. Each circuit of the 
Dual Nx56/64 can be craft provisioned to provide 
up to 24 channels in increments of N=56 or 64k, or 
one channel. Design operation is to transmit or 
receive high rate synchronous data from data 
terminal equipment (DTE) over T1. Transmission 
data rates for each circuit of the Dual Nx56/64 
range from 56 kbps to 1.536 Mbps using noncon-
tiguous bandwidth assignment. The Dual Nx56/64 
features:

Noncontiguous bandwidth assignment

Built-in DSU

Two circuits with synchronous operation to 
1.536 Mbps in increments of 56/64 kbps

 50% duty cycle output clock at all rates

 Hot swappable

 User provisioned via craft interface on SCU

FRONT PANEL LEDS

Provisioning Options

Label

Status

Description

STAT

z

z

2

z

Green
Yellow
Yellow Flashing
Red

Dual Nx56/64 is operating normally
Dual Nx56/64 is in test mode
No DS0s have been assigned
Dual Nx56/64 failure ; T1 down ; No data transfer

RD

z

Green

Transmitting data from the customer to the 
network (T1)

TD

z

Green

Receiving data from the network and transmitting 
to the customer (V.35)

Option

Description

Default

Circuit

Selects the active port

Port 1

Channel 
Rate

Selects channel data rate:

– 56 kbps
– 64 kbps

64 kbps

DSR

Normal 

– DSR follows DTR

Forced ON

– DSR forced on and DTR ignored

Normal

CTS

Normal

– CTS follows RTS

Forced ON

– CTS forced on and RTS ignored

Normal

DCD

Normal

– DCD active when loops in sync and/or 

T1 carrier present

Forced ON

– Causes DCD to be forced on always

Normal

CLOCK

Auto

– Measures the delay between the DTE data 

and its clock and automatically selects 
between Internal and INT-INV

Internal

– Allows the Nx56/64 to provide transmit 

data clock

External

– Derives DTE transmit clock from the DTE 

device

Internal Invert

– Inverted form of the DTE TX CLK setting

Auto

Total Access 1500

Dual Nx56/64 Data Service Unit Data Port 

(DSU DP)

INSTALLATION

After unpacking the Dual Nx56/64, inspect it for damage. 
If damage is noted, file a claim with the carrier and then 
contact ADTRAN. For more information, refer to the 
warranty. 
To install the Dual Nx56/64, perform the following steps:

1. Insert Dual Nx56/64 into any two consecutive slots 

of the Total Access 1500 chassis. To insert, hold the 
Dual Nx56/64 by the faceplate while supporting the 
bottom edge of the card. Align the card edge with the 
guide grooves in the first of the two consecutive slots 
chosen to install the card in. Insert into chassis until 
the edge connector seats firmly into the chassis back-
plane. Lock the unit in place by pushing in on the 
locking lever.

2. Check 

STAT

 LED for operational status.

3. Assess Provisioning. The factory default settings are 

listed in the Provisioning Options table. If further 
provisioning is desired proceed to step 

4

.

4. Connect VT100 compatible terminal to SCU faceplate 

ADMIN port. Craft port settings are: 9600 baud, no 
parity, 8 data bits, 1 stop bit, and no flow control.
a. Connect DB-9 cable
b. Run terminal emulation program
c. If using Windows HyperTerminal, open by 

selecting Programs/Accessories/HyperTerminal

d. Login and navigate through ADMIN port menu 

structure

NOTE: To ensure proper display background, select VT100 

Terminal Emulation under settings.

5. Navigate through menus to perform desired function.

NOTE: To traverse through the menus, select the desired 

entry and press Enter. To work backwards in the 

menu, press ESC (escape key.)

6. Allocate channels to the Dual Nx56/64.

a. Connect VT100 compatible terminal to SCU.
b. Select the online LIU.
c. Set the bank mode to manual map.
d. Select the time slot assignment option.
e. Select the T1 to assign time slots from.
f. Select the time slot to assign to a port of the 

Dual Nx56/64.

g. Enter the slot that contains the Dual Nx56/64 

(i.e. if the card takes up slots 23 and 24 of the 
bank, enter slot 23.)

h. Select the appropriate port of the Dual Nx56/64 

to assign the time slot to.

i. Select option 3 to assign the DS0.
j. Select “Yes” to confirm the assignment or “No” 

to cancel assignment.

CLEI: VAL4NS0D_ _
Product P/N: 1180025L1

Issue Date: 0803

Document P/N: 61180025L1-22B

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