TxPORT Transport PRISM 3021 User manual

i
TRANSPORT
®
34-00262
January 1998
PRISM 3021
E1
NTU/DSU

ii
Copyright
©1998 TxPORT. All rights reserved. No part of this publication may be reproduced, transmitted, transcribed,
stored in a retrieval system, or translated into any language in any form by any means without the written per-
mission of TxPORT.
Reorder # 34-00262
2nd Edition, January 1998
TxPORT shall not be liable for errors contained herein or for incidental or consequential damages in connec-
tion with the furnishing, performance, or use of this material. TxPORT reserves the right to revise this publi-
cation from time to time and make changes in content without obligation to notify any person of such revision
changes.
Contents of this publication may be preliminary and/or may be changed at any time without notice and shall
not be regarded as a warranty.
Documentation Disclaimer
TxPORT makes no representation or warranties of any kind whatsoever with respect to the contents hereof
and specifically disclaims any implied warranties of merchantability or fitness for any particular purpose.

iii
Table of Contents
1. General
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
Network Interface . . . . . . . . . . . . . . . . . . . . . . .1-2
Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
Mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
Environmental . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
FCC Requirements . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
Canadian Emissions Requirements . . . . . . . . . . . . . .1-3
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3
Ordering Numbers . . . . . . . . . . . . . . . . . . . . . . . . . .1-3
TxPORT Customer Service . . . . . . . . . . . . . . . . . . .1-4
Technical Support . . . . . . . . . . . . . . . . . . . . . . .1-4
Returns/RMA . . . . . . . . . . . . . . . . . . . . . . . . . .1-4
2. Installation
Safety Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
Unpacking and Inspection . . . . . . . . . . . . . . . . . . . . .2-1
Supplied Materials . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
Unit Configuration . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
Configuration Switch S1 . . . . . . . . . . . . . . . . .2-2
Network Framing . . . . . . . . . . . . . . . . . . . .2-2
CRC4 Mode . . . . . . . . . . . . . . . . . . . . . . . .2-2
Network Line Code . . . . . . . . . . . . . . . . . . .2-2
Timing Source . . . . . . . . . . . . . . . . . . . . . . .2-2
Keep Alive Framed and Unframed Ones . .2-2
Data Normal or Inverted . . . . . . . . . . . . . . .2-3
Program Flash . . . . . . . . . . . . . . . . . . . . . . .2-3
Address Switch S2 . . . . . . . . . . . . . . . . . . . . . . .2-3
Configuration Switch S3 . . . . . . . . . . . . . . . . .2-3
NMS Port Rate . . . . . . . . . . . . . . . . . . . . . .2-3
SUPV Port Rate . . . . . . . . . . . . . . . . . . . . .2-3
Boot Mode . . . . . . . . . . . . . . . . . . . . . . . . .2-4
DTE Rate Multiplier . . . . . . . . . . . . . . . . . .2-4
Channel Assignment . . . . . . . . . . . . . . . . . .2-4
National Bit Selection SW1 . . . . . . . . . . . . . . . .2-4
Configuration Switch S4 . . . . . . . . . . . . . .2-5
DTE Rate . . . . . . . . . . . . . . . . . . . . . . . . . .2-5
Jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5
E1 Network Impedance . . . . . . . . . . . . . . .2-5
Station Clock Signal Levels . . . . . . . . . . . .2-5
E1-DTE Option Switch S1 . . . . . . . . . . . . . . . .2-6
CRC4 Mode . . . . . . . . . . . . . . . . . . . . . . . .2-6
E1-DTE Line Code . . . . . . . . . . . . . . . . . . 2-6
Spares . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
E1-DTE Termination . . . . . . . . . . . . . . . . . 2-6
Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Supervisory (SUPV) Port . . . . . . . . . . . . . . . . . 2-6
Standalone Connections . . . . . . . . . . . . . . . . . . 2-7
DTE PORT . . . . . . . . . . . . . . . . . . . . . . . . 2-7
1051 Chassis Connections . . . . . . . . . . . . . . . . 2-7
DTE Interfaces . . . . . . . . . . . . . . . . . . . . . . 2-7
NMS Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
NMS IN and NMS OUT . . . . . . . . . . . . . . 2-9
NMS Split Cable . . . . . . . . . . . . . . . . . . . . 2-9
NMS IN . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
NMS OUT . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Chassis Operation . . . . . . . . . . . . . . . . . . . 2-9
Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Power Connection . . . . . . . . . . . . . . . . . . . . . . . 2-9
External Clock Connection . . . . . . . . . . . . . . . 2-10
3. Operation
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Front Panel Controls and Indicators . . . . . . . . . . 3-1
General Status Indicators . . . . . . . . . . . . . . . . 3-1
DTE Indicators . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Test Controls and Indicators/Terminal Access . 3-1
Front Panel Testing . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Test Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Supervisory Port . . . . . . . . . . . . . . . . . . . . . . . 3-2
Upgrading Software . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
4. Terminal Operation
Terminal Interface . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Screen Components . . . . . . . . . . . . . . . . . . . . . 4-1
Device Type and Revision . . . . . . . . . . . . . 4-1
Date and Time . . . . . . . . . . . . . . . . . . . . . . 4-1
Element ID . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Menu Title . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Near and Far Element: . . . . . . . . . . . . . . . . 4-1
Messages . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Local and Remote Screen Indicator . . . . . 4-2
Cursor Controls . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Field Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Software Configuration . . . . . . . . . . . . . . . . . . . . . . 4-3
Interface Start-up . . . . . . . . . . . . . . . . . . . . . . . 4-3
Menu Structure . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Alarms Screen . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
NET Alarms . . . . . . . . . . . . . . . . . . . . . . . 4-4
DTE Alarms . . . . . . . . . . . . . . . . . . . . . . . 4-4

iv
alarm status . . . . . . . . . . . . . . . . . . . . . . . . .4-4
Reset Alarm Registers . . . . . . . . . . . . . . . .4-4
Performance Screens . . . . . . . . . . . . . . . . . . . . .4-5
Element . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5
Target . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5
Error Events . . . . . . . . . . . . . . . . . . . . . . . .4-5
FEBE Events . . . . . . . . . . . . . . . . . . . . . . . .4-6
Reset Performance Registers . . . . . . . . . . .4-6
Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-6
Completed Days . . . . . . . . . . . . . . . . . . . . .4-6
Completed Intervals . . . . . . . . . . . . . . . . . .4-6
24 Hr.% Error Free . . . . . . . . . . . . . . . . . . .4-6
30 Day % Error Free . . . . . . . . . . . . . . . . . .4-6
Performance Data . . . . . . . . . . . . . . . . . . . .4-6
E1 24 Hour and E1 30 Day
Error Parameters . . . . . . . . . . . . . . . . . . . . .4-6
Standard 24 Hour and Standard 30 Day
Error Parameters . . . . . . . . . . . . . . . . . . . . .4-6
Enhanced 24 Hour and Enhanced 30 Day
Error Parameters . . . . . . . . . . . . . . . . . . . . .4-7
Element Maintenance Screen . . . . . . . . . . . . . . .4-8
Clear Tests . . . . . . . . . . . . . . . . . . . . . . . . .4-8
Clear Alarms . . . . . . . . . . . . . . . . . . . . . . . .4-8
E1 Loop . . . . . . . . . . . . . . . . . . . . . . . . . . .4-8
E1 Unloop . . . . . . . . . . . . . . . . . . . . . . . . . .4-9
Port Loop . . . . . . . . . . . . . . . . . . . . . . . . . .4-9
Port Unloop . . . . . . . . . . . . . . . . . . . . . . . .4-9
BERT . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-9
Patterns . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-9
Test Length . . . . . . . . . . . . . . . . . . . . . . . . 4-9
Pattern Sync . . . . . . . . . . . . . . . . . . . . . . . . 4-9
Elapsed Time . . . . . . . . . . . . . . . . . . . . . . . 4-9
Bit Errors . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
Errored Seconds . . . . . . . . . . . . . . . . . . . . 4-9
% EFS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
Start Test . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
Reset Errors . . . . . . . . . . . . . . . . . . . . . . . . 4-9
E1-NET and E1-DTE Status . . . . . . . . . 4-10
Near Loops . . . . . . . . . . . . . . . . . . . . . . . 4-10
Far Loops . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
Configuration Screen . . . . . . . . . . . . . . . . . . . 4-12
Line Parameters . . . . . . . . . . . . . . . . . . . 4-13
Alarm Parameters . . . . . . . . . . . . . . . . . . 4-15
Port Configuration . . . . . . . . . . . . . . . . . . 4-16
Management Ports . . . . . . . . . . . . . . . . . . 4-18
Summary . . . . . . . . . . . . . . . . . . . . . . . . . 4-19
Utilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-20
Set Time . . . . . . . . . . . . . . . . . . . . . . . . . . 4-20
Set Date . . . . . . . . . . . . . . . . . . . . . . . . . . 4-20
Date Format . . . . . . . . . . . . . . . . . . . . . . . 4-20
New Password . . . . . . . . . . . . . . . . . . . . . 4-20
Maintenance Reset . . . . . . . . . . . . . . . . . 4-21
Factory Reset . . . . . . . . . . . . . . . . . . . . . . 4-21
A. Flash PROM Download Procedure
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . A-1
PC Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

General 1-1PRISM 3021
1. General
Introduction
The TxPORT PRISM 3021 is a modular, single port, frac-
tional E1 NTU/DSU. The PRISM 3021 provides all the
standard, high-quality features found in all PRISM products.
TxPORT has a complete E1 solution with the combination
of the 3021 E1 NTU/DSU, 2048 PMU/NTU, and 8100A
Site Controller.
The PRISM 3021 can be installed in minutes. Card-edge
switches allow for all major configuration items to be
quickly selected. Full configuration and maintenance selec-
tions are available through the built-in VT100 user interface.
Configuration can also be done using Telnet or SNMP Sets
and Gets if the 8100A Site Controller is the manager.
The PRISM 3021 can be ordered with ITU V.35 or EIA-530
interfaces as well as a E1-DTE option card. Channel assign-
ments can be customized to a variety of configurations.
Trouble isolation is simple with the PRISM 3021. Loops can be
generated for the near-end unit as well as for the far-end unit.
Multiple loops allow segmentation of the network and isolating
the problem quickly. Loops include line loopbacks, payload
loopbacks, digital loopbacks, and channelized loopbacks.
A full complement of Bit Error Rate Testing (BERT) pat-
terns is available on the PRISM 3021. The different stress
patterns provide a greater diagnostic capability. BERT pat-
terns are initiated from either the front panel switch or
through the user interface. Testing can also be initiated from
the 8100A Site Controller.
The PRISM 3021 provides several ways to manage a net-
work. An end-to-end data link provides remote communica-
tions to the distant end. Configuration and maintenance of
the remote unit can be done from the central site. The
8100A Site Controller provides a single interface point to
manage up to 50 units. The 8100A even provides an SNMP/
Telnet access for the PRISM 3021 and complete network
management from one central LAN management station.
The chapters in this manual are arranged as follows:
Introduction - Describes product specifications, FCC and
warranty information, in addition to TxPORT ordering num-
bers and Customer Service telephone numbers.
Installation - describes unit mounting, switch configuration,
interface connections, and unit powering.
Operation - describes the front panel controls and indica-
tors, unit testing, and control port features.
LOCFAR
D
T
E
TD
RD
RTS
DTR
STATUS
TRANSPORT
®
E1 CSU/DSU
N
E
T
BV/CR/FE
LOS/OOF
AIS
REM ALM
LOOP
TST
ERR
Figure 1-1 3021 Front Panel
S
U
P
V
1
8
3021
T
S
T

1-2 General PRISM 3021
Terminal Operation - Describes the terminal interface setup
and the menu-based screens which appear during a local or
remote session.
Features
• EIA-530*, V.35, or X.21* data interfaces
• Nest-mount unit fits into standard 1051 chassis
• Available as a standalone unit
• Full set of performance registers
• Full diagnostics including multiple loops and BERT patterns
• SNMP and Telnet supplied through the 8100A Site Controller
• E1-DTE option card
• Framed and multi-framed modes supported
• HDB3 and AMI line code supported
• Field upgradable Flash memory
• Built-in user interface
• Configuration switches
Specifications
Network Interface
Service Types: CEPT/E1
Line Rate: 2.048 Mbps (± 50 ppm)
Framing: CAS or CCS
Line Code: AMI or HDB3
Input Signal: 0 to -22.5 dB ALBO
Line Connection: 75 Ω:BNC
120 Ω: DB-15, twinax, and RJ-48
Output Signal: Per G.703 with 75-Ωor 120-Ωoption
Surge Protection: 1000 volts
High-Speed Data
Port Compatibility: ITU V.35 female DB-25, female 34-pin
through adapter cable, ITU X.21 female
DB-15; EIA-530 DB-25
Rate: Synchronous, N×56, or N×64 kbps
(N = 1 to 31)
Clocking: Internal or external
Data Invert: Enabled or disabled
Configuration
Configuration: Card-edge switches
Terminal interface on the supervisory
port, Telnet session using the 8100A
SNMP Management System. Soft con-
figuration is non-volatile.
Diagnostics
Performance: RFC1406 (with the 8100A)
Status: Front panel LEDs for network, testing,
and DTE
Network Loopbacks: Line, payload, and proprietary
E1-DTE
Loopbacks: Line and proprietary
DTE Loopbacks: Responds to and generates V.54 inband
loop codes and performs bidirectional
fractional-port loopback
Power
Power: - 48 VDC, 150 mA, max; 7.2 W,
(24.6 BTU, max)
Mechanical
Mounting: Wall, vertical, horizontal rack, or
TxPORT 1051 chassis
Weight: 1 pound, nominal
Compliance
FCC Compliance: Part 15, Class A, Subpart B
US Safety: UL 1950, Third Edition
Canadian Safety: CSA: C22.2 No. 950-95
G.703: Signal Waveform
G.704: Framing
G.732: Multiframing
G.823: Jitter
G.831: Framing Requirement
Environmental
Operating Temp: 0°to 50°C(32°to 122°F)
Storage Temp: -20°to 85°C(-4°to 185°F)
Relative Humidity: 95% maximum, non-condensing
FCC Requirements
This equipment has been tested and found to comply with
the limits for a Class A digital device, pursuant to Part 15 of
FCC Rules. These limits are designed to provide reasonable
protection against harmful interference when the equipment
is operated in a commercial environment. This equipment
generates, uses, and can radiate radio frequency energy and
if not installed and used in accordance with the instruction
manual, may cause harmful interference to radio communi-
cations. Operation of this equipment in a residential area is
likely to cause harmful interference in which case the user is
required to correct the interference at his own expense.
Shielded cables must be used to ensure compliance with the
Class A FCC limits.
* Not available at time of printing.

General 1-3PRISM 3021
WARNING: Changes or modifications to this
unit not expressly approved by the party responsi-
ble for compliance could void the user’s authority
to operate the equipment.
This device complies with Part 15 of the FCC rules.
Operation is subject to the following two conditions:
1. This device may not cause harmful interference.
2. This device must accept any interference received, including
interference that may cause undesired operation.
Canadian Emissions
Requirements
This digital apparatus does not exceed the Class A limits for
radio noise emissions from digital apparatus set out in the
Radio Interference Regulations of the Canadian Department
of Communications.
On 48-VDC units only, end users should use
existing 48-VDC battery sources or a CSA-certi-
fied power supply.
Le présent appareil numérique n’émet pas de bruits
radioélectriques dépassant les limites applicables aux appar-
eils numériques (de la class A) prescrites dans le Règlement
sur le brouillage radioélectrique édicté par le ministère des
Communications du Canada.
Caution: Users should not attempt to make such connec-
tions themselves, but should contact the appropriate electric
inspection authority, or electrician, as appropriate.
Warranty
TxPORT warrants each unit against defects in material and
workmanship for a period of five years from the date the
unit was shipped to the customer. If the unit malfunctions at
any time during the warranty period, TxPORT will repair, or
at TxPORT’s option, replace the unit free of charge.
The remedies listed herein are the users sole and exclusive
remedies. TxPORT shall not be liable for any indirect,
direct, incidental or consequential damages. The owner must
return the unit to the factory, shipping prepaid and packaged
to the best commercial standard for electronic equipment.
TxPORT will pay shipping charges for delivery on return.
The customer is responsible for mode and cost of shipment
to TxPORT. This warranty does not apply if the unit has
been damaged by accident, misuse or as a result of service
or modification by other than TxPORT personnel.
Ordering Numbers
The PRISM 3021 is available with a single V.35 or EIA-530
data port. Table 1-A provides the unit ordering numbers.
Table 1-A Unit Ordering Numbers
F-3021-100--ABCDEF PRISM 3021 Nest mount
F-3021-101--ABCDEF PRISM 3021 Standalone
ACompany 1 - TxPORT
BSpecial Option 1 - Standard Unit
CNetwork Interface 1 - 75-ohm coax
2 - 120-ohm RJ-48
3 - 120-ohm DB-15
4 - 120-ohm twinax
DDTE Interface 1 - V.35
2 - EIA-530 *
3 - X.21*
EDSX E1-DTE
Option 0 - Not Installed 1 - 120-ohm E1 RJ-48
2 - 120-ohm E1 twinax
3 - 120-ohm E1 DB-15
4 - 75-ohm E1 coax
FOption 0 - Future Option
* Not available at time of printing.

1-4 General PRISM 3021
The equipment options shown in Table 1-B may be required
for the installation and operation of the 3021. TxPORT Customer Service
TxPORT office hours are Monday through Friday from 8
a.m. to 5 p.m Central Time. For general, sales and marketing
information, contact TxPORT at:
Toll Free: 888-4TxPORT
Toll Free: 800-926-0085
Local: 205-772-3770
International: 205-772-3770
e-mail: [e-mail]
Technical Support
Technical support is available 24 hours a day, seven days a
week. You may contact a support representative by tele-
phone or e-mail.
Toll Free: 1-800-285-2755
Local: 205-772-3770
International: 205-772-3770
e-mail: [e-mail]
Returns/RMA
If for any reason you need to return a TxPORT unit, you
must have a Return Material Authorization (RMA) number
marked on the shipping package. You may obtain an RMA
number from customer service at 888-4TxPORT; 800-926-
0085, ext. 2227; or for local or international customers 205
-772-3770.
When calling TxPORT for an RMA, please have the follow-
ing information available.
• Model number and serial number for each unit.
• Reason for return and symptoms of problem.
• Warranty status (if known).
• Purchase order number to cover charges for out-of-warranty
items.
• Name and phone number of person we can contact if we
have questions about the unit(s).
• Mode of shipment required (second-day air is the normal
mode of shipment for all returned material unless otherwise
specified).
Units being returned to TxPORT should be sent to the fol-
lowing address:
TxPORT
127 Jetplex Circle
Madison, Alabama 35758
Table 1-B Optional Equipment
Part Number Optional Equipment
Network and E1-DTE Cables
9-1001-004-xxx 8-pin mod to 8-pin mod (four twisted pairs)
9-1001-006-1
9-1001-006-2 8-pin mod to 15-pin D-type adapter, male 8-pin mod to 15-pin D-adapter, female
Supervisory Cables and Adapter
9-1001-073-2 DB-9 female to 8-pin (PC to SUPV)
9-1544-619-005
9-1544-619-010
9-1544-619-020
8-pin cable, 5 feet
8-pin cable, 10 feet
8-pin cable, 20 feet
9-1001-015-1
9-1001-016-2 DB-25 pin/8-pin modular adapter (terminal) DB-25 pin/8-pin modular adapter (for modem)
NMS Cable
9-1001-030-xxx dual 6-pin mod to 8-pin mod
V.35 Cables
9-1001-001-xxx
9-1001-311-xxx
9-1001-312-xxx
V.35 male-to-male null modem cable
V.35 male-to-male cable, straight thru
V.35 male-to-female cable, straight thru
EIA-530 Cables
9-1001-511N-xxx
9-1001-511-xxx
9-1001-512-xxx
EIA-530 male-to-male null modem cable
EIA-530 male-to-male cable, straight thru
EIA-530 male-to-female cable, straight thru
X.21 Cable*
9-1001-098-xxx DB-25 to DB-15
E1-DTE Cables and Adapters
9-1001-106-xxx
9-1001-105-xxx
9-1544-638-1†
9-1544-639-1†
120-Ωtwinax to RJ-48
75-ΩBNC to RJ-48
75-ΩDB-15 to RJ-48 adapter, male, w/slide
latch
75-ΩRJ-48 to RJ-48 adapter, female,
w/slide latch
xxx = length
005 = 5 feet
010 = 10 feet
020 = 20 feet
* Not available at time of printing.
† Order with part number 9-1001-004-xxx.

Installation 2-1PRISM 3021
2. Installation
This chapter contains information and instructions required
to prepare the TxPORT PRISM 3021 for use. This chapter
includes initial inspection procedures, mounting instruc-
tions, configuration guidelines, connection instructions, and
powering information.
Throughout this manual, all factory default set-
tings are shown underlined.
Safety Summary
This manual contains information and warnings which must
be followed by the user to ensure safe operation and to
retain the equipment in a safe condition.
This WARNING sign denotes a poten-
tial hazard to the operator. It calls
attention to a procedure or practice which, if
not correctly performed or adhered to, could
result in injury or loss of life. Do not proceed
beyond a WARNING sign until the indicated
conditions are fully understood and met.
Follow proper electrostatic discharge (ESD) pro-
cedures while handling the circuit boards.
Unpacking and Inspection
Upon receipt of shipment, inspect the shipping container
and contents. If the contents of the shipment are incomplete
or, if there is mechanical damage or defect, notify TxPORT
Customer Service. If the shipping container or cushioning
material is damaged, notify the carrier and TxPORT imme-
diately and make a notation on the delivery receipt that the
container was damaged (if possible, obtain the signature and
name of the person making delivery). Retain the packaging
material until the contents of the shipment have been
checked for completeness and the instrument has been
checked both mechanically and electrically.
Supplied Materials
The PRISM 3021 shipment contains the following items:
• PRISM 3021 unit
• Reference manual with configuration guide
• Adapter cables, if appropriate
Mounting
The TxPORT 3021 NTU/DSU is a modular unit that plugs
into either a single-unit housing or into a TxPORT 1051
chassis which holds up to 12 units.
The chassis can be installed in either a 19- or 23-inch rack
using four screws. Connections are made from the rear panel
of the chassis.
Unit Configuration
The PRISM 3021 can be hardware configured by switches or
software configured by using a terminal connection to the
front panel supervisory access (SUPV) port (see SUPV Port
Rate on page 2-3 to configure the port’s data rate and
Optional Equipment on page 1-4 for the appropriate cable
and adapter). The terminal interface provides more capabili-
ties than do the configuration switches. For terminal configu-
ration options, refer to Software Configuration on page 4-3.
In the event of power failure, the 3021 retains its configura-
tion in non-volatile memory. This feature allows the unit to
automatically restore normal service following a power loss.
See Utilities on page 4-20 for more information.
The 3021 stores its operating firmware in Flash memory. If
a software upgrade is ever needed, TxPORT will provide the
hex files, the download program, and the downloading
instructions.
Hardware switches on the upper and lower sides of the cir-
cuit boards allow configuring most simple applications.
These switches are described in the following paragraphs. If
an ambiguous configuration is programmed, the unit over-
rides invalid configuration items. When power is applied to
the unit, front panel indicators STATUS, TST, and BV/CR/
FE flash for several seconds.
The unit is hardware configured using four DIP switches on
the upper side between the circuit boards (see Figure 2-2 on
page 2-2); one rotary switch and one DIP switch located on
the lower side (see Figure 2-5 on page 2-4); as well as jump-
ers located opposite the E1-DTE card (see Figure 2-6 on
page 2-5). Switch positions are numbered as follows: posi-
tion 2 of switch S3 is referred to as Switch S3-2, and so on.
Before installation, verify and record each configuration
switch setting on the removable configuration guide that is
included at the back of this manual.
!

2-2 Installation PRISM 3021
Configuration Switch S1
Switch S1 (Figure 2-2) is used to set the configuration
parameters listed in the following paragraphs.
Factory default settings are underlined through-
out this manual.
NETWORK FRAMING
Position S1-1 is used to select Channel Associated Signaling
(CAS) network framing or Common Channel Signaling
(CCS) network framing as shown in Table 2-A.
CRC4 MODE
Position S1-2 is used to enable or disable CRC4 as shown in
Table 2- B.
NETWORK LINE CODE
Position S1-3 selects High-Density Bipolar of order 3
(HDB3) line code or Alternate Mark Inversion (AMI) line
code as shown in Table 2-C. HDB3 provides clear channel
capability.
TIMING SOURCE
Positions S1-4 and S1-5 are used to select the source of unit
clocking as shown in Table 2-D. Deriving timing from the
network is the most common timing source for most applica-
tions. The unit may also be clocked from its internal oscilla-
tor; from equipment attached to the DTE; or from equipment
attached to the E1-DTE option card.
KEEP ALIVE FRAMED AND UNFRAMED ONES
Position S1-6 selects keep alive framed and unframed ones
as shown in Table 2-E. Keep alive is generated when the
unit detects LOS or OOF.
Table 2-A Network Framing
Functions S1-1
Network Framing CAS Down
Network Framing CCS Up
Table 2-B CRC4 Mode
Functions S1-2
CRC4 enabled Down
CRC4 disabled Up
Switch S1
8
1234567
Switch S2
8
1234567
Switch S3
8
1234567
Switch S4
51234
Figure 2-1 Top-Edge View of the PRISM 3021
7654321
Down Up
8
Network CRC4 Network Data Normal Program Framing Mode Flash or Inverted Keep Alive Framed and Unframed Ones Line Code Timing Source Timing Source
Figure 2-2 Switch S1
Table 2-C Network Line Code
Network Line Code S1-3
HDB3 Down
AMI Up
Table 2-D Timing Source
Timing Source S1-4 S1-5
Network Down Down
Internal Down Up
E1 DTE Up Down
DTE or External Up Up
Table 2-E Keep Alive Framed and Unframed Ones
Mode S1-6
Keep Alive Unframed Ones Down
Keep Alive Framed Ones Up

Installation 2-3PRISM 3021
DATA NORMAL OR INVERTED
Position S1-7 is used to select if data is normal or inverted
as shown in Table 2-F.
Units at both ends of the circuit must have this
option set the same.
PROGRAM FLASH
Position S1-8 is used to enable or disable programming the
Flash memory as shown in Table 2-G.
When switch S1-8 is in the Up position,
the unit goes into download mode. After
downloading the unit, move S1-8 to the Down
position. If this switch is left in the Up position
and power is lost, the unit powers back up in the
download mode.
Address Switch S2
Switch S2 sets the unit address. When using the 3021 with
an 8100A Site Controller, each element must have a unique
unit address. The 8100A Site Controller can address up to 50
units (with addresses from 1 to 50). If the unit is not con-
nected to a site controller, the NMS unit address should be
left at the factory default setting of 1 where Position 1 is Up
and all other positions are Down (see Figure 2-3).
Figure 2-3 Switch S2
Switch S2 has eight positions used to create an 8-bit binary
code for an address in the range of 1 to 50. Switch position
S2-1 is the least significant bit (LSB) and S2-8 is the most
significant bit (MSB). If a switch is down, its value is 0. If
up, its value is that of the upper location. The values are
additive. For example, to set a unit address to 5, position S2-
3 (binary value is 4) and position S2-1 (binary value is 1)
would be set Up for a unit address of 5 (4 + 1). All other
positions would be set Down. If all the switches are Down,
the address is 1.
Configuration Switch S3
Switch S3 (Figure 2-4) is used to set the configuration
parameters listed in the following paragraphs.
NMS PORT RATE
Positions S3-1 and S3-2 select the NMS port rate as shown
in Table 2-H. This is a serial RS-232 DCE port configured
for eight bits, no parity, and one stop bit. If the 3021 is being
used with the 8100A, the NMS rate of all units must be set
the same.
SUPV PORT RATE
Positions S3-3 and S3-4 select the SUPV port rate as shown
in Table 2-I. This port is used to access the embedded termi-
nal interface. This is a serial RS-232 DCE port configured
for eight bits, no parity, and one stop bit.
Table 2-F Data Normal or Inverted
Data S1-7
Normal Down
Inverted Up
Table 2-G Program Flash
Program Flash S1-8
Disabled Down
Enabled Up
LSB MSBBinary values
1248163264128
00000000
7654321
Down Up
8
Table 2-H NMS Port Rate
NMS Port Rate S3-1 S3-2
19200 bps Down Down
9600 bps Down Up
2400 bps Up Down
1200 bps Up Up
Table 2-I SUPV Port Rate
SUPV Port Rate S3-3 S3-4
38400 bps Down Down
19200 bps Down Up
9600 bps Up Down
2400 bps Up Up
7654321
Down Up
8
NMS Port NMS Port SUPV Port DTE Rate Channel Rate Assignment Multiplier Boot Mode Rate SUPV Port Rate Boot Mode
Figure 2-4 Switch S3
Rate

2-4 Installation PRISM 3021
BOOT MODE
Position S3-5 and S3-6 select the boot mode as shown in
Table 2 -J.
DTE RATE MULTIPLIER
Position S3-7 is used to select the DTE rate multiplier as
shown in Table 2-K. The switch is used in conjunction with
switch S4 to determine the DTE rate.
CHANNEL ASSIGNMENT
Position S3-8 selects the channel assignment mode as shown in
Table 2-L for network E1 DS0s that carry data to the high-speed
port. Contiguous channel mode assigns the channels as a block
beginning at channel one. For example, if the high-speed port data
rate is 256 kbps (as shown in Table 2-N on page 2-5), the unit
would assign network channels 1 through 4 to the high-speed port.
Alternate channel mode assigns an idle channel following
each data channel. Using the example above, data is carried
on channels 1, 3, 5, and 7 while channels 2, 4, 6, and 8 are
set idle (binary code 01111111). The advantage of alternate
channel assignment is that E1 ones-density requirements are
maintained by the idle channels rather than placing any
restriction on the high-speed data.
National Bit Selection SW1
SW1 is located as shown in Figure 2-5 and is used to
choose a national bit to create a 4-kbps datalink between the
endpoint units. Both endpoint units must have the same
national bit selected to utilize the datalink. The national bit
is selected as shown in Table 2-M.
Table 2-J Boot Mode
Mode S3-5 S3-6
Switches Down Down
RAM Down Up
ROM Up Down
Reserved for future expansion. Up Up
Table 2-K DTE Rate Multiplier
DTE Rate Multiplier S3-7
N×64 Down
N×56 Up
Table 2-L Channel Assignment
Channel Assignment S3-8
Contiguous Down
Alternating Up
Figure 2-5 BOTTOM-EDGE VIEW OF PRISM 3021
Switch S1
18765432
Switch SW1
0
1
2
3
4
5
6
7
8
9
(E1-DTE Option Card)
Table 2-M National Bit
National Bit Switch Position
None 0
SA4 1
SA5 2
SA6 3
SA7 4
SA8 5
None 6-9

Installation 2-5PRISM 3021
CONFIGURATION SWITCH S4
DTE RATE
Positions S4-1 through S4-5 select the DTE rate as shown in
Table 2-N. The DTE rate multipliers (N×56 and N×64) are deter-
mined by setting switch S3-7 (see Table 2-K on page 2-4).
Jumpers
To configure E1 network impedance, remove the E1-DTE
card as shown in Figure 2-6 and place the jumpers as
explained in the following paragraphs.
E1 NETWORK IMPEDANCE
The network termination of the 3021 can be selected for
either 75 or 120 ohms. Placing the jumpers for J5 and J12 in
the center post and the post labeled 120 configures the unit
for 120-ohm termination. Placing the jumpers for J5 and J12
in the center post and the post labeled 75 configures the unit
for 75-ohm termination.
STATION CLOCK SIGNAL LEVELS
The 3021 accepts an RS-423-compatible station clock input.
Contacts are provided on the rear of the 1051 chassis (12-
slot chassis) to permit connection to an external timing
Table 2-N DTE Rate
DTE
Rate N×56 (kbps) N×64 (kbps) S4-1 S4-2 S4-3 S4-4 S4-5
N=311, 21736 1984 Down Down Down Down Down
N=30 11680 1920 Up Down Down Down Down
N=29 11624 1856 Down Up Down Down Down
N=28 11568 1792 Up Up Down Down Down
N=27 11512 1728 Down Down Up Down Down
N=26 11456 1664 Up Down Up Down Down
N=25 11400 1600 Down Up Up Down Down
N=24 11344 1536 Up Up Up Down Down
N=23 11288 1472 Down Down Down Up Down
N=22 11232 1408 Up Down Down Up Down
N=21 11176 1344 Down Up Down Up Down
N=20 11120 1280 Up Up Down Up Down
N=19 11064 1216 Down Down Up Up Down
N=18 11008 1152 Up Down Up Up Down
N=17 1952 1088 Down Up Up Up Down
N=16 1896 1024 Up Up Up Up Down
N=15 840 960 Down Down Down Down Up
N=14 784 896 Up Down Down Down Up
N=13 728 832 Down Up Down Down Up
N=12 672 768 Up Up Down Down Up
N=11 616 704 Down Down Up Down Up
N=10 560 640 Up Down Up Down Up
N=9 504 576 Down Up Up Down Up
N=8 448 512 Up Up Up Down Up
N=7 392 448 Down Down Down Up Up
N=6 336 384 Up Down Down Up Up
N=5 280 320 Down Up Down Up Up
N=4 224 256 Up Up Down Up Up
N=3 168 192 Down Down Up Up Up
N=2 112 128 Up Down Up Up Up
N=15664DownUpUpUpUp
1
This selection is not valid if the Channel Assignment is set to
Alternating.
2This selection is not valid for CAS mode.
T1
T2
J14
J15
J16
J17
J5
J12
J13
Front
E1-DTE
Option Card
U6
U5
T1
T2
3021
Figure 2-6 Jumper Placement on the 3021
75
120
75
120
J6

2-6 Installation PRISM 3021
source (using TB1, pins 1 and 2). The station timing is con-
figured through the terminal interface. Refer to
Line Parameters on page 4-13.
Contacts are provided on the rear of the stand-alone unit to
permit connection to an external timing source (using pins 1
and 2). An alternate method for network connection is also
provided with pins 3 through 6. Connection information is
shown in Table 2-S.
E1-DTE Option Switch S1
Switch S1 (Figure 2-7) is located as shown on Figure 2-5
and is used to configure the E1-DTE parameters listed in the
following paragraphs.
CRC4 MODE
Position S1-1 is used to enable or disable CRC4 for the E1-
DTE option as shown in Table 2-O.
E1-DTE LINE CODE
Position S1-2 selects the E1-DTE line code as shown in
Table 2-P.
SPARES
Positions S1-3 through S1-7 are not used and should be left
Down.
E1-DTE TERMINATION
Position S1-8 is used to select the E1-DTE termination as
shown in Table 2-Q. This setting must agree with the place-
ment of the J7 shown in Figure 2-8.
Connections
Supervisory (SUPV) Port
The front panel supervisory (SUPV) port serves several
functions. The unit firmware may be accessed through this
port (see Terminal Interface on page 4-1) as well as the Call
On Alarm feature (see Management Ports on page 4-18).
This port may be accessed through either a direct connec-
tion or a dial-up connection using an AT-command-set-com-
patible modem. The modem should be optioned to ignore
DTR, enable auto answer, inhibit command echo, and return
verbose result codes.
If the unit is called and sent a break command
before receiving the connect message, the modem
hangs up.
The 8100A Site Manager may be directly connected to the
eight-pin modular serial port connector labeled SUPV (refer
to SUPV Port Rate on page 2-3). When a group of elements
is connected in an NMS chain, the 8100A site Controller
may be connected to the supervisory port of any one of the
elements. This element can then route messages onto the
NMS chain to reach the other elements. The COA feature
only works through the supervisory port.
Table 2-O CRC4
CRC4 S1-1
CRC4 enabled Down
CRC4 disabled Up
Table 2-P E1-DTE Line Code
E1-DTE Line Code S1-2
HBD3 Down
AMI Up
7654321
Down Up
8
CRC4 E1-DTE Spare Spare Line Mode Termination Spare Spare Spare
Figure 2-7 Switch S1
Line Code
Table 2-Q E1-DTE Termination
E1-DTE Termination S1-8
75 ohm Down
120 ohm Up
Figure 2-8 Setting J7 on the E1-DTE Option Card
S1
J7
T1 T2 75 ohm 120 ohm
J7
T1 T2
E1-DTE Option Card

Installation 2-7PRISM 3021
This port is a DCE port configured for 8 bits, no parity, and
1 stop bit. The physical connections are 8-pin modular jacks
(electrically RS-232). Refer to TxPORT Customer Service
on page 1-4 for cable information. The pinout for this port
is shown in Table 2-R.
Standalone Connections
The standalone version of the 3021 has the same connec-
tions as the 1051 nest-mount chassis, except that there is no
34-pin Winchester-type high-speed DTE connector. Any
information unique to the standalone rear panel is in this
section, otherwise follow the reference in Table 2-S. Pinouts
for the standalone rear panel connections are provided in
Table 2-S. Figure 2-9 shows the rear panel of the standal-
one chassis.
DTE PORT
The DTE port pinout is shown in the column labeled DB-25
25-pin of Table 2-T.
1051 Chassis Connections
The 1051 nest-mount chassis provides all the necessary con-
nections to in Figure 2-13 and Figure 2-14 on page 2-11.
DTE INTERFACES
Both models of the TxPORT 1051 chassis provide connec-
tion to the customer equipment. Each slot of the 1051-2 has
a corresponding E1 DTE 8-pin RJ-48 connector and a high-
speed DTE female 25-pin connector located on the chassis
rear panel. The 1051-3 chassis is similar except that it has a
high-speed DTE 34-pin connector instead of the 25-pin con-
nector. The pinout for the E1 DTE RJ-48 connector is given
in Table 2-V and the pinout for the high-speed DTE con-
nectors is given in Table 2-T.
Table 2-R Supervisory (SUPV) Port Connector
Pinout
Pin Supervisory Port Interface
1ControlOut
2 Signal Ground
3 Data Out
4 Data In
5 Signal Ground
6ControlIn
6 1
Figure 2-9 Rear Panel of 3021 Standalone Chassis
6
NMS IN
1 6
NMS OUT
1 8
E1 DTE
1 8
NETWORK
1
ALARM/POWER
NETWORK/EXT CLK
DTE
PORT
1
13
14 25
1 6
Table 2-S Pinouts for Standalone Rear Panel Connectors
Pin NMS IN NMSOUT E1 DTE NETWORK POWER EXT CLK
1 Not Used Not Used Tip Output Data In 48 V Return Network Input (Tip)
2 Signal Ground Signal Ground Ring Output Data In Signal Ground Network Input (Ring)
3 Data Out Data Out Not Used Not Used -48 VDC Network Output (Tip)
4 Data In Not Used Tip Input Data Out Frame Ground Network Output (Ring)
5 Signal Ground Signal Ground Ring Input Data Out Alarm Contact Station Clock (Ring)
6 Not Used Not Used Not Used Not Used Alarm Common Station Clock (Tip)
7, 8 Chassis Ground Chassis Ground
page 2-9 page 2-9 page 2-7 page 2-9 page 2-9 page 2-5

2-8 Installation PRISM 3021
X.21 - To convert the X.21 interface from the DB-25 to a
DB-15 connector, use part number 9-1001-098-xxx. Pinouts
for the DB-25 to DB-15 adapter are shown in Table 2-U.
E1 DTE Port - The PRISM 3021 provides an optional E1
DTE port interface for E1-DTE applications. The E1 DTE
connector (This connector is labeled T1 DTE on the rear
panel of the 1051 chassis. The 1051 chassis can be used for
DDS, E1, and T1 circuits.) pinout is shown in Table 2-V.
The PRISM 3021 has four styles of E1-DTE connectors: an
RJ-48, a DB-15, a 75-ohm BNC, and a 120-ohm twinax. The
pinout for the RJ-48S connectors are given in Table 2-X.
NMS Port
The PRISM 3021 is fully compatible with the TxPORT
8100A Site Controller.
NMS ports provide access to the 8100A Site Controller. The
unit accesses the built-in 1051 chassis bus.
An element may be accessed by using an RS-232 connec-
tion from the serial port of the computer running the 8100A
program to the element’s SUPV port or the (A) NMS IN
Table 2-T High-Speed DTE Connector Pinout
ITU/EIA
Circuit Common Name DB-25
25-pin V.35 34-pin DCE
101/AA Frame Ground 1 A Gnd
102/AB Signal Ground 7 B Gnd
103/BA (A) Transmit Data A 2 P In
103/BA (B) Transmit Data B 14 S In
104/BB (A) Receive Data A 3 R Out
104/BB (B) Receive Data B 16 T Out
105/CA Request to Send 4 C In
106/CB Clear to Send 5 D Out
107/CC Data Set Ready 6 E Out
108/CD Data Term Ready 20 H In
109/CF Data Carrier Detect 8 F Out
114/DB (A) Transmit Clock A 15 Y Out
114/DB (B) Transmit Clock B 12 AA Out
115/DD (A) Receive Clock A 17 V Out
115/DD (B) Receive Clock B 9 X Out
113/DA (A) External Clock A 24 U In
113/DA (B) External Clock B 11 W In
141/LLB Local Loopback 18 J In
140/RLB Remote Loopback 21 BB In
142/TM Test Mode 25 K Out
Table 2-U DB-25 to DB-15 Adapter Cable Pinout for
the X.21 Interface
Common Name DB-25 DB-15
Framing Ground 1 1
Signal Ground 7 8
Transmit Data 2
14 2 9
Receive Data 3
16 4 11
Data Carrier Detect 8
10 5 12
Receive Clock 17
96 13
Sec. Rec. Data/Byte
Timing 6 22 7 14
Table 2-V E1 DTE Pinout
Pin E1 DTE Signal
1TipOutput
2 Ring Output
3 Not Used
4 Tip Input
5 Ring Input
6 Not Used
7, 8 Chassis Ground

Installation 2-9PRISM 3021
and (A) NMS OUT ports. The different connection methods
are described in the following paragraphs.
NMS IN AND NMS OUT
The two 6-pin modular connectors labeled (A) NMS IN and
(A) NMS OUT may be used for connection to the 8100A Site
Controller. This port is configured to allow the connection of
multiple collocated units in a daisychained IN/OUT bus
arrangement as shown in Figure 2-10. The OUT port of one
element is connected to the IN port of the next element, and
so on, to form a complete chain among the group of elements.
All units on the same NMS chain must use the
same NMS bit rate and have different addresses
(see NMS Port Rate on page 2-3, Switch S2 on
page 2-3, and Switch S3 on page 2-3).
NMS SPLIT CABLE
The 8100A Site Controller may be connected directly into the
NMS chain between two elements. A Y-cable is used from
the 8100A serial port which splits the transmit and receive
signals into two 6-pin modular connectors for the (A) NMS
IN and (A) NMS OUT ports. Ordering information for this
cable is found in Ordering Numbers on page 1-3.
NMS IN
The (A) NMS IN connector provides both the transmit and
receive signal pair. This port may be used for a modem con-
nection or as a VT100 terminal interface (see Terminal
Interface Layout on page 4-1).
NMS OUT
The (A) NMS OUT connector only provides the receive sig-
nal pair.
CHASSIS OPERATION
8100A Site Controller operation has the units chained
together. The front panel supervisory port and the rear panel
NMS ports operate in the same fashion.
The NMS address, port rate, and power up configuration
mode may be set by either configuration switches or through
software control. The physical connection is a 6-pin modu-
lar connector with the pinouts for these connectors shown in
Table 2-W. This port is a serial RS-232 DCE port config-
ured for eight bits, no parity, and one stop bit.
Network
The PRISM 3021 has four styles of network adapter cables:
a 75-ohm BNC, and a 120-ohm twinax, a 120-ohm RJ-48,
and a 120-ohm DB-15. The BNC and twinax connectors are
standard. The pinouts for the RJ-48 and DB-15 connectors
are given in Table 2-X.
Power Connection
The 3021 requires a -48 VDC power source capable of sup-
plying a 150-mA current. All units in the chassis are pow-
ered by -48 VDC sources which are connected to the 6-
position terminal strip, TB2, on the rear of the 1051 chassis.
The power supply should be sized for maximum current
draw for the chassis.
The 1051 chassis is designed with two power buses. The A
bus feeds the odd slots and the B bus feeds the even slots. A
power board is installed on TB2 which allows the connec-
tion of two independent -48 VDC supplies operated in
redundant mode. This is the default configuration described
in Redundant Power Source below. The other powering
method is described in Single Power Source.
Figure 2-10 NMS Daisychain Arrangement
NMS OUT IN/OUT (standalone)
OUT IN (nest-mount)
8100A
NMS IN OUT
Element #1
NMS IN OUT
Element #2
NMS IN OUT
Last Element
Table 2-W NMS Port Connector Pinouts
Pin (A) NMS Bus IN (A) NMS Bus OUT
1 Not Used Not Used
2 Signal Ground Signal Ground
3 Data Out Data Out
4 Data In Not Used
5 Signal Ground Signal Ground
6 Not Used Not Used
Table 2-X Network Connector Pinouts
Connector
Type Tip Input Ring Input Tip Output Ring Output Ground
RJ-48 1 2 4 5 7, 8
DB-15 3 11 1 9 2, 4

2-10 Installation PRISM 3021
Redundant Power Source: The power board allows the
connection of two independent -48 VDC supplies operated
in a redundant mode. All slots are powered from the com-
bined input from the A and B power supplies (the A and B
buses are in a logical OR arrangement). If one supply fails,
the other powers the entire chassis. An example using a
TxPORT 1041 power supply is shown in Figure 2-11.
Single Power Source: Using a single power source is
essentially the same as the redundant configuration with
power supply B not operational. If the redundant power
board is not used, the A and B buses must be connected
together as shown in Figure 2-12.
External Clock Connection
Contacts on the rear of the 1051 chassis permit connection
to an external timing source (using TB1, pins 1 and 2). The
station timing is configured through the Terminal Interface
(see Line Parameters on page 4-13) or through the configu-
ration switches (see Timing Source on page 2-2).
TxPORT
1051
Chassis
TxPORT
1041
Power
Supply
–
+
GND
1
2
3
4
5
6
TB2
Figure 2-11 Wiring for Redundant Power Sources
PS A
PS B
TxPORT
1051
Chassis
TxPORT
1040
Power
Supply
–
+
GND
1
2
3
4
5
6
TB2
Figure 2-12 Wiring for a Single Power Source
PS A
PS B
–
+
GND

Installation 2-11PRISM 3021
Unit 1 Unit 2 Unit 3 Unit 4 Unit 5 Unit 6 Unit 7 Unit 8 Unit 9 Unit 10 Unit 11 Unit 12
Rack and19" or 23" Multiple
Line Chassis Mounting Hardware
Figure 2-13 Model 1051-3 Chassis, Front View
( A )
ENET
High
Speed
DTE
12
High
Speed
DTE
11
High
Speed
DTE
10
High
Speed
DTE
1
High
Speed
DTE
2
High
Speed
DTE
3
High
Speed
DTE
4
High
Speed
DTE
5
High
Speed
DTE
6
High
Speed
DTE
7
High
Speed
DTE
8
High
Speed
DTE
9
NMS
OUT
( A )
NMS
IN
( B )
NMS
IN
T1
DTE
12
T1
DTE
11
T1
DTE
10
T1
DTE
9
T1
DTE
8
T1
DTE
7
T1
DTE
6
T1
DTE
5
T1
DTE
4
T1
DTE
3
T1
DTE
2
T1
DTE
1
TB2 - 23456
1
1 - EXT CLK
2 - EXT CLK
3 - ALARM RING
TB1
4 - ALARM TIP
5 - SIG GND 1 - +48V RTN (B)
2 - FRAME GND
3 - -48V IN (B)
4 - -48V IN (A)
5 - SIG GND
6 - +48V RTN (A)
TB2
T1
NET
12
T1
NET
11
T1
NET
10
T1
NET
9
T1
NET
8
T1
NET
7
T1
NET
6
T1
NET
5
T1
NET
4
T1
NET
3
T1
NET
2
T1
NET
1
( B )
NMS
OUT
16
TB1 - 23451
Redundant
Power
Board
NOTE: The DB-25 version (1051-2) is also available (the V.35 is shown).
Figure 2-14 Model 1051-3 Chassis, Rear View
For 3021 applications, read E1 in place of T1 on the rear of the 1051 chassis.

2-12 Installation PRISM 3021