Paradyne Hotwire 7974 User manual

1
Hotwire®TDM SDSL Standalone Termination Units
Models 7974-A2, 7975-A2, and 7976-A2
Installation Instructions
Document Number 7900-A2-GN11-20
December 2001
Product Documentation Online
Complete documentation for this product is available at www.paradyne.com. Select
Library
→
Technical Manuals
→
Hotwire DSL Systems.
Select the following document:
7900-A2-GB21
Hotwire TDM SDSL Standalone Termination Units,
Models 7974-A2, 7975-A2, 7976-A2, User’s Guide
To order a paper copy of a Paradyne document:

Within the U.S.A., call 1-800-PARADYNE (1-800-727-2396)

Outside the U.S.A., call 1-727-530-8623
Be sure to register your warranty at www.paradyne.com/warranty.
Package Checklist
Verify that your package contains:
❑Hotwire®TDM SDSL Standalone Termination Unit
❑24 VDC power transformer with separate power cable
–or –
6-conductor direct connection DC power cable
❑8-position-modular-to-8-position-modular network cable
❑DB9-to-8-position modular terminal cable
Notify your sales representative if anything is missing.

2
Installation Overview
Installation and configuration of the Hotwire 797x Standalone Termination Unit consists
of:
 Connecting power to the unit.
 Connecting to the network.
 Connecting to a DTE.
 Connecting a system terminal.
 Providing initial unit identity information or changing existing identity information.
 Configuring your unit using the Configuration Edit menus.
Before you install the unit, read the
Important Safety Instructions on page 35.
See the User’s Guide for additional information about:
 Configuration Options
 Messages and Troubleshooting
 Technical Specifications
 Connectors, Cables, and Pin Assignments
Connecting Power to the Unit
If your package includes a power transformer:
1. Plug the power cable into an AC outlet having a nominal voltage rating between
100–240 VAC.
2. Connect the power cable to the transformer.
3. Connect the output cable of the transformer to the connector marked POWER on
the rear panel.
If your package includes a direct-connection DC power cable:
Connect the unit to an external +24 or –48 VDC SELV (Safety Extra Low Voltage) power
source as described in the following section.

3
Connecting the Unit to an Optional External +24 or –48 VDC Power
Source
Using the DC power cable, the unit is capable of operating on a +24 VDC or –48 VDC
SELV power supply.
Procedure
To use the DC power cable for +24 VDC:
1. Connect the green wire to a suitable ground.
2. Connect the orange wire to the +24 VDC source.
3. Connect the white wire to the return.
4. Cut the black, red, and blue wires off at the outer insulation.
5. Plug the power connector into the unit.
Procedure
To use the DC power cable for –48 VDC:
1. Connect the green wire to a suitable ground.
2. Connect the orange wire to the –48 VDC source.
3. Connect the black wire to the return.
4. Cut the red, white, and blue wires off at the outer insulation.
5. Plug the power connector into the unit.
Power Cable Pinouts
Pin Number Wire Color Signal
1Black–48 VDC Return
2Red–48 VDC Return
3 Green Ground
4 White +24 VDC Return
5 Orange –48 VDC
+24 VDC
6 Blue No Connection
99-16291
23
546
1

4
Connecting to the Network
Procedure
To connect your unit to the network:
1. Connect one end of the supplied 8-position-modular-to-8-position-modular network
cable into the rear panel DSL jack.
2. Connect the other end to your DSL network interface.
NOTE:
Do
not
use a flat VF network cable as this may severely degrade the
performance of the unit. Use only Cat 5 twisted-pair network cable.
Connecting to a DTE
See
Connectors, Cables, and Pin Assignments
in the User’s Guide for specifications of
the connectors and cables.
Model DTE Connection
7974 The DSX-1 interface is an RJ48C, 8-position, unkeyed modular connector.
An RJ48C-to-DB15 T1 network interface adapter cable is available from
Paradyne.
7975 The synchronous interface is a 25-pin EIA-530-Ainterface. Depending onthe
cable used, the interface can be adapted to an X.21, RS-449, or V.35
interface.
7976 The G.703 interface is either two BNC connectors (Transmit and Receive) for
a 75-ohm unbalanced interface or an RJ48C, 8-position, unkeyed modular
connector for a 120-ohm balanced interface.

5
LEDs
The following table contains a description of the LEDs on the Hotwire 797x Standalone
Termination Unit’s front panel.
Label Color LED is . . .*
* Slow Cycling: LED turns off and on in equal duration once per second.
Fast Cycling: LED turns off and on in equal duration 5 times per second.
Pulsing: LED turns off momentarily once per second.
Indicating . . .
POWER Green On
Off
Slow Cycling
Normal operation.
No power to the unit.
Unit is in minimum mode and a download is
required.
ALARM Red On
Off
Device failure, or self-test has failed.
Self-test passed.
TEST Yellow On
Off
Slow Cycling
Loopback test or 511 test pattern in progress.
No tests in progress.
Self-test in progress.
DSL Green On
Off
Slow Cycling
Fast Cycling
DSL link is up.
The DSL link is down.
DSL training in progress.
An OOF condition.
DSX-1
DTE
G.703
Green On
Off
Slow Cycling
Fast Cycling
DTE port is operational.
DSX-1: No signal on DTE port.
Sync DTE:Configured control leads (DTR/RTS)
are not asserted.
G.703: No signal on DTE port.
DSX-1: Yellow Alarm Indication received.
Sync DTE: Not applicable.
G.703: Remote Alarm Indication received.
DSX-1: OOF, LOF, EER, or AIS condition.
Sync DTE: Not applicable.
G.703: OOF, LOF, EER, or AIS condition.

6
Connecting to a System Terminal
An optional system maintenance terminal may be attached to your Hotwire 797x
Standalone Termination Unit through the modular jack on the rear panel. The system
maintenance terminal allows you to view the status of the unit and change configuration
options. The terminal must be a VT100-compatible terminal or a PC running terminal
emulation software.
Procedure
To connect your unit to a system terminal:
1. Connect the 9-pin end of the supplied terminal cable into a COM port on your PC.
2. Plug the other end into the modular jack on the rear panel.
3. Set the communication parameters on your PC or terminal to:
—9600 baud
—8 bit characters
—no parity
—1 stop bit
—no flow control
Press Enter from your terminal or PC to activate the Main Menu for the attached unit.
The system runs diagnostics and status checks. After a few moments, the Main Menu or
Logon screen appears on your terminal.
main Hotwire
Model 797x
MAIN MENU
Status
Test
Configuration
Control
-----------------------------------------------------------------------------
Ctrl-a to access these functions Exit

7
Asynchronous Terminal Interface Menu
The following illustration shows the menu paths to the different terminal screens.
Main
Status Test
System and
Test Status Performance Statistics Display LEDs Identity
Network
Error
StatisticsNetwork
Performance
Statistics
Configuration Control
Factory
Config
Configuration
Loader
Current Configuration
Edit/Display
System
Options Communication Port Management and
Communication
Change
Identity
Administer
Logins
Download
Code
Apply
Download
Reset
AutoRate
Device
Tests
Abort
All
Tests
01-16496-03
Reset
Device
Network
General SNMP
Management SNMP NMS Security
Communication
Protocol
Telnet
Session SNMP Traps
7974: DSX-1 Statistics
7975: (Not Applicable)
7976: G.703 Statistics
7974: Network and DSX-1 Tests
7975: Network Tests
7976: Network and G.703 Tests
7974: (Not Applicable)
7975: Sync Data Port Tests
7976: (Not Applicable)
7974: DSX-1
7975: Sync Port
7976: G.703
Current
Network
Performance

8
Entering Identity Information
After accessing your unit for the first time, use the Change Identity screen to determine
SNMP administrative system information that will be displayed on the Identity screen of
the Status branch. To access the Identity screen, follow this menu selection sequence:
Main Menu → Control → Change Identity
Selecting a Configuration Method
You can make configuration changes either through a VT100-compatible terminal and
the unit’s Configuration menus or by manually changing switches on the board. The unit
is shipped with the switchpacks disabled to allow settings to be made through the
Configuration menus. See the User’s Guide for detailed information about the
configuration options and switch settings.
Configuring the Unit Using the Configuration Menus
Use the Configuration menu to select, display, or change configuration option settings.
NOTE:
The Hotwire 797x Standalone Termination Unit is shipped configured as an NTU. If
using this unit as an NTU, the configuration options may not need to be altered.
The unit has two sets of configuration option settings:
 The Current Configuration: The unit’s active set of configuration options.
 The Default Factory Configuration: A read-only configuration area containing the
factory default configuration options.

9
Displaying Configuration Options
To display configuration options, you must first load a configuration into the edit area. To
load aconfiguration option set into the configuration edit area, follow this menu selection
sequence:
Main Menu → Configuration (Load Configuration From)
Make a selection by placing the cursor at your choice and pressing Enter.
Configuration Edit/Display
The Configuration Edit/Display screen is displayed when the current or default
configuration is loaded. To access the Configuration Edit/Display screen, follow this
menu selection sequence:
Main Menu → Configuration →Current Configuration
–or –
Main Menu → Configuration → Default Factory Configuration
If you select . . . Then . . .
Current
Configuration The selected configuration option set is loaded and the Configuration Edit/Display menu screen appears.
Default Factory
Configuration The selected configuration option set is loaded and the Configuration Edit/Display menu screen appears.
Configuration
Loader The Configuration Loader screen is displayed allowing you to upload or download configurations from a TFTP server.
main/config/edit
Model: 797x
CONFIGURATION EDIT/DISPLAY
Network
DSX-1 | SYNC Port | G.703
System Options
Communication Port
Management and Communication
-----------------------------------------------------------------------------
Ctrl-a to access these functions, ESC for previous menu MainMenu Exit
Save

10
Select . . . To Access the . . . To Configure the . . .
Network Network Interface Options (Table 1) DSL network interface on
the unit.
DSX-1
SYNC Port
G.703
DSX-1 Interface Options –Model
7974 (Table 2)
Synchronous Data Port Options –
Model 7975 (Table 3)
G.703 Interface Options –Model
7976 (Table 4)
DSX-1 interface
(Model 7974)
Synchronous DTE interface
(Model 7975)
G.703 interface
(Model 7976)
System Options System Options (Table 5) General system options of
the unit.
Communication
Port Communication Port Options (Table 6) Unit’s COM port options.
Management
and
Communication

Telnet Session Options (Table 7)

Communication Protocol Options
(Table 8)

General SNMP Management
Options (Table 9)

SNMP NMS Security Options
(Table 10)

SNMP Traps Options (Table 11)
Management supportof the
unit through SNMP and
Telnet.

11
Table 1. Network Interface Options (1 of 2)
Margin Threshold
Possible Settings: –5db, –4db, –3db, –2db, –1db, 0db, 1db,2db,3db,4db,5db,
6db,7db,8db,9db,10db
Default Setting: 0db
Determines the level, expressed in decibels, at which a signal-to-noise margin alarm
condition is reported.
Excessive Error Rate Threshold
Possible Settings: 1E–4,1E–5,1E–6,1E–7,1E–8,1E–9
Default Setting: 1E–6
Determines the error rate at which an excessive error rate (EER) condition is
recognized. The rate is the ratio of the number of CRC errors to the number of bits
received in a certain period.
AutoRate
Possible Settings: Enable, Disable
Default Setting: Disable
Determines whether the unit automatically adjusts to the best line rate for conditions,
or is fixed at the rate in the DSL Line Rate field.
DSL Line Rate
Possible Settings (depends on model): 144, 272, 400, 528, 784, 1040, 1552, 2064
Default Setting (Model 7974): 1552
Default Setting (Model 7975, 7976): 2064
Determines the fixed line rate of the LTU when AutoRate is disabled.
Max DSL AutoRate
Possible Settings (depends on model): 144, 272, 400, 528, 784, 1040, 1552, 2064
Default Setting (Model 7974): 1552
Default Setting (Model 7975, 7976): 2064
Determines the maximum rate to which the unit can AutoRate.

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EIA-530 Payload Rate
Possible Settings (Model 7974): 64, 128, 256, 384, 512, 768, 1024, 1536
Default Setting: [Highest multiple of 64 Kbps supported by the DSL Line Rate]
Possible Settings (Model 7976): 64, 128, 192, 256, 320, 384, 448, 512, 576, 640,
768, 960, 1024, 1536, 1920, 1984, 2048
Default Setting: [Highest multiple of 64 Kbps supported by the DSL Line Rate]
When the NTU has an EIA-530-A interface, the Payload Rate set on the LTU
determines the port speed of the synchronous port of the NTU.
To achieve the payload rates listed above, the Model 7975-A2 endpoint must be
operating with firmware V02.03.2 or greater and the Model 7976-A2 endpoint must be
operating with firmware N02.03.2 or greater. In lower firmware versions (N.02.03.05
and below), the payload rate is only selectable ata DSL line rate of 144 Kbps while all
other rates default to the maximum, depending on the DSL line rate selected.
Transmit Attenuation
Possible Settings: 0dB –15dB
Default Setting: 0dB
Determines how much the unit’s transmit power is reduced to accommodate a short
line length.
Peer IP Address
Possible Settings: 001.000.000.000 –223.255.255.255, Clear
Default Setting: 000.000.000.000
When configured as the LTU, specifies the peer IP address for the NTU, to provide
remote management providing the remote management link on the DSL loop.
Circuit Identifier
Possible Settings:
ASCII text field , Clear
Default Setting: [blank]
Uniquely identifies the circuit number of the transmission vendor’s DSL line for
troubleshooting purposes.
Table 1. Network Interface Options (2 of 2)

13
Table 2. DSX-1 Interface Options –Model 7974
Line Coding
Possible Settings: AMI, B8ZS
Default Setting: B8ZS
Specifies the line coding format to be used by the DSX-1 interface.
Line Framing
Possible Settings: ESF, D4
Default Setting: ESF
Specifies the framing format to be used by the DSX-1 interface.
Line Equalization
Possible Settings: 0–133, 133–266, 266–399, 399–533, 533–655
Default Setting: 0–133
Compensates for signal distortion for a DSX-1 signal over a given distance.
Excessive Error Rate Threshold
Possible Settings: 1E–4,1E–5,1E–6,1E–7,1E–8,1E–9
Default Setting: 1E–4
Determines the error rate at which an excessive error rate (EER) condition is
recognized. The rate is the ratio of the number of CRC errors to the number of bits
received in a certain period.
Send (AIS) on Network Failure
Possible Settings: Enable, Disable
Default Setting: Enable
Specifies the action taken on the signal transmitted to the DSX when a valid signal
cannot be recovered from the network interface (LOS or cognitions OOF, AIS, or
EER).
Primary Clock Source
Possible Settings: DSX, Internal
Default Setting: Internal
When configured as the LTU, specifies from where the unit will derive its timing.

14
Table 3. Synchronous Data Port Options –Model 7975 (1 of 2)
Port Type
Possible Settings: E530A, V.35, RS449, X.21
Default Setting: E530A
Determines the port type for the data port.
NOTE: If X.21 is selected for Port Type, set Send All Ones on Data Port Not Ready
to RTS or Disable.
Payload Rate
Possible Settings: 64,128,192,256,320,384,448,512,576,640,704,768,832,
896,960,1024,1088,1152,1216,1280,1344,1408,1472,1536,1600,1664,
1728,1792,1856,1920,1984,2048
Default Setting: [Highest multiple of 64 Kbps supported by the DSL Line Rate]
Specifies the payload rate of the port. This option is not displayed on the unit when
AutoRate is enabled or the unit is configured as an NTU. The LTU configures the
payload rate for the NTU. The highest multiple of 64 Kbps is used when Autorate is
enabled.
NOTE: Payload rates of 1088 Kbps and higher pertain only to 2 Mbps models.
Transmit Clock Source
Possible Settings: Internal, External
Default Setting: Internal
When configured as the LTU, specifies whether the transmitted data for the
synchronous data port is clocked using an internal clock provided by the LTU or an
external clock provided by the DTE connected to the synchronous data port.
Invert Transmit Clock
Possible Settings: Disable, Enable
Default Setting: Disable
When configured as the LTU and Transmit Clock Source is set to External, specifies
whether the clock supplied by the the unit on the TXC interchange circuit DB
(ITU-T 114) is phase inverted with respect to the Transmitted Data interchange circuit
BA (ITU-T 103). This configuration option is useful when an excessive cable length
between the unit and the DTE causes errors.

15
Send All Ones on Data Port Not Ready
Possible Settings: Both, Disable, DTR, RTS
Default Setting: Both
Specifies the conditions on the data port that determine when valid data is not being
sent from the DTE. When this condition is detected, all ones are sent to the network.
NOTE: Set Send All Ones on Data Port Not Ready to RTS or Disable if X.21 is
selected for Port Type.
Action on Network LOS Alarm
Possible Settings: Halt, None
Default Setting: Halt
Specifies the action taken on the synchronous data port when an LOS (Loss Of
Signal) alarm is received on the network interface.
Network Initiated Data Channel Loopback
Possible Settings: Disable, Enable
Default Setting: Disable
Allows the initiation and termination of a Data Channel Loopback (DCLB) by the
receipt of a DCLB-actuate sequence or DCLB-release sequence from the network or
far-end device.
Port (DTE) Initiated Loopbacks
Possible Settings: Disable, DTLB, DCLB, Both
Default Setting: Disable
Allows the initiation and termination of a local Data Terminal Loopback (DTLB) or
remote Data Channel Loopback (DCLB) by the DTE connected to this port. (DTLB is
equivalent to a V.54 loop 3, and DCLB is equivalent to a V.54 loop 2.) Control of these
loopbacks is through the DTE interchange circuits as specified by the V.54 standard.
ElasticStore
Possible Settings: Disable, Enable
Default Setting: Enable
When configured as the LTU,used to enable or disable a first-in, first-out (FIFO) buffer
circuit for the incoming external clock. This circuit is used to compensate for the
differences between the frequencies of the data clocks for the two units in the circuit.
This option only applies if the unit is set for external timing. Do not enable Elastic
Store if the attached DCE has an elastic store buffer larger than 32 bits.
Table 3. Synchronous Data Port Options –Model 7975 (2 of 2)

16
Table 4. G.703 Interface Options –Model 7976
Framing
Possible Settings: Framed, Unframed
Default Setting: Framed
Specifies whether G.704 framing is used for the G.703 interface.
Line Coding
Possible Settings: AMI, HDB3
Default Setting: HDB3
Specifies the line coding format to be used by the G.703 interface.
Line Framing
Possible Settings: CRC4, noCRC4
Default Setting: noCRC4
Specifies the framing format to be used by the G.703 interface.
Time Slot 16
Possible Settings: Signaling, Data
Default Setting: Signaling
Specifies whether the G.703 interface is used for voice or data.
Send (AIS) on Network Failure
Possible Settings: Enable, Disable
Default Setting: Enable
Specifies the action taken on the signal transmitted to the G.703 when a valid signal
cannot be recovered from the network interface (LOS or conditions OOF, AIS, or
EER).
Primary Clock Source
Possible Settings: G.703, Internal
Default Setting: Internal
Specifies from where the unit will derive its timing.

17
Table 5. System Options
DSL Mode
Possible Settings: LTU, NTU
Default Setting: NTU
Controls whether the unit is configured as a control unit or tributary unit.
NOTE: Changing this option will reset the unit.
Test Timeout
Possible Settings: Enable,Disable
Default Setting: Enable
Allows tests to end automatically. The feature should be enabled when the unit is
remotely managed so that control can be regained after a test is accidentally
executed.
Test Duration (min)
Possible Settings: 1 –120
Default Setting: 10
Number of minutes for a test to be active before automatically ending.
Telco Initiated Loopback
(Model 7974)
Possible Settings: Enable,Disable
Default Setting: Enable
Determines if the unit will respond to loopback commands on the DSX-1 interface.
Remote Telco Line Loopback
(Model 7974)
Possible Settings: Enable,Disable
Default Setting: Disable
Determines if the unit will perform a Telco-initiated loopback on just the local unit or if
the loopback will be performed on the remote DSL unit.
G.703 Line Termination
(Model 7976)
Possible Settings: 75 ohms, 120 ohms
Default Setting: 120 ohms
Specifies which G.703 connection’s are being used by the unit, the 75 ohm TX and
RX connectors or the 120 ohm interface.

18
Table 6. Communication Port Options (1 of 2)
Port Use
Possible Settings: Terminal, Net Link
Default Setting: Terminal
Specifies how the communications port is to be used.
Port Type
Possible Settings: Asynchronous, Synchronous
Default Setting: Asynchronous
When Port Use is set to Net Link, Port Type controls whether the communication port
will be asynchronous or synchronous.
Data Rate
Possible Settings: 9.6, 14.4, 19.2, 28.8, 38.4, 57.6, 115.2
Default Setting: 9.6
Specifies the communication port baud rate.
Character Length
(Terminal Use Only)
Possible Settings: 7, 8
Default Setting: 8
Determines the character length of the communication port.
Parity
(Terminal Use Only)
Possible Settings: None, Odd, Even
Default Setting: None
Specifies the parity of the communication port.
Stop Bits
(Terminal Use Only)
Possible Settings: 1, 1.5, 2
Default Setting: 1
Specifies the number of stop bits for the communication port.

19
Ignore Control Leads
(Terminal Use Only)
Possible Settings: Disable, DTR
Default Setting: Disable
Specifies whether DTR is used.
Login Required
(Terminal Use Only)
Possible Settings: Enable, Disable
Default Setting: Disable
Specifies whether an ID and password are required to access the asynchronous
terminal interface on the communication port. Login IDs are created with a password
and access level.
Port Access Level
(Terminal Use Only)
Possible Settings: Administrator, Operator
Default Setting: Administrator
Specifies the highest level of access allowed when accessing an ATI session through
a Telnet session.
Inactivity Timeout
(Terminal Use Only)
Possible Settings: Enable, Disable
Default Setting: Disable
Provides automatic logoff of a Telnet session.
Disconnect Time (Minutes)
(Terminal Use Only)
Possible Settings: 1 –60
Default Setting: 5
Number of minutes of inactivity before the session terminates automatically. Timeout
is based on no keyboard activity.
Table 6. Communication Port Options (2 of 2)

20
Table 7. Telnet Session Options
Telnet Session
Possible Settings: Enable, Disable
Default Setting: Enable
Specifies if the unit will respond to a Telnet session request from a Telnet client on an
interconnected IP network.
Telnet Login Required
Possible Settings: Enable, Disable
Default Setting: Disable
Specifies whether a user ID and password are required to access to the ATI through a
Telnet session. Login IDs are created with a password and access level.
Session Access Level
Possible Settings: Administrator,Operator
Default Setting: Administrator
The Telnet session access level is interrelated with the access level of the Login ID.
Inactivity Timeout
Possible Settings: Enable, Disable
Default Setting: Disable
Provides automatic logoff of a Telnet session.
Disconnect Time (Minutes)
Possible Settings: 1 –60
Default Setting: 5
Number of minutes of user inactivity before a Telnet session terminates automatically.
Time out is based on no keyboard activity.