Verilink 2048 User Manual
Introduction
2048
PMU/NTU
®
TRANSPORT
Reference Manual
34-00179
2nd Edition
Table of Contents
Operation
Introduction .................................................................3-1
Front Panel Descriptions .............................................3-1
General
Introduction ................................................................. 1 -1
Design Highlights ....................................................... 1 - 2
Specifications .............................................................. 1-2
FCC /European Requirements .................................... 1 -3
Warranty ...................................................................... 1 - 3
Ordering Numbers ...................................................... 1 - 4
TxPORT Customer Service ....................................... 1 - 4
Installation
Introduction ................................................................. 2 -1
Safety Summary ......................................................... 2-1
Unpacking And Inspection ........................................ 2 - 1
Supplied Materials ...................................................... 2-1
Mounting ..................................................................... 2 -1
Stand - alone Unit ................................................. 2 - 1
Chassis Assembly ............................................... 2-2
Unit Configuration ..................................................... 2- 2
Switch SW1 (BERT Pattern) ............................... 2-2
Switch SW2 (National Bit) ................................. 2-2
Switch S1 (Network LBO) .................................. 2-2
Switch S2 (Chassis Operation) ........................... 2-3
Switch S4 (Configuration) ................................... 2-3
Switch S5 (Configuration) ................................... 2-3
Switch S6 (Bit Rate Selection) ............................. 2-4
Switch S7 (Address) ............................................ 2-4
Equipment Connection ................................................ 2-5
Network Connection ................................................... 2-5
Network Management ................................................ 2 -5
Supervisory Port ................................................... 2-5
PTT Port .............................................................. 2 - 6
User Port ............................................................. 2-7
Chassis Network Management ............................. 2-7
Alarm Connection ....................................................... 2-8
Stand - alone Unit ................................................. 2 - 8
Chassis Assembly ............................................... 2-8
Power Connection ...................................................... 2 -8
Stand - alone Unit ................................................. 2 - 8
Chassis Assembly ............................................... 2-8
General Status Indicators ................................... 3 - 1
Alarm Controls & Indicators ..............................3 -1
Test Controls & Indicators .................................3-2
Front Panel Testing .....................................................3-2
Test Switch ......................................................... 3-2
Test Access Jacks ..............................................3-2
Supervisory Port ................................................. 3-2
BERT Pattern Select ............................................3-2
Terminal Operation
Introduction ................................................................. 4 -1
System Description ..................................................... 4-1
Modem Compatibility .......................................... 4-1
Screen Components ............................................. 4-1
Interface Start Up ................................................. 4-2
Daisy-Chain Menu Operation ............................. 4-2
Cursor Controls .................................................... 4-2
Field Types .......................................................... 4-3
Main Menu Screen ...................................................... 4-3
Alarms Screen ............................................................. 4-4
Performance Screens ................................................... 4-5
Maintenance Screen .................................................... 4-7
Test Loops ........................................................... 4-8
BERT ................................................................... 4- 8
Line Fault and Loop Status .................................. 4-8
Configuration Screens ................................................. 4-9
Line Configuration .............................................. 4-9
Alarm Configuration ............................... ...... ...... . 4-10
Utilities Screen ............................................................ 4-10
General Functions ................................................ 4-11
COA Parameters .................................................. 4 - 11
Index
Configuration Guide
Copyright / Liability
Copyright
© 1995 TxPOR T, All rights re served. No part of this pub licatio n may be repro duced, transmitted, transcribed, stored in a retrieval system, or translated into any language in any form
by any means without the written permission of TxPORT.
Reorder # 34-00179
2nd Edition, July 1995
TxPORT shall not be liable for errors contained herein or for incidental or consequential
damages in connection with the furnishing, performance, or use of this material. TxPORT
reserves the right to revise this publication from time to time and make changes in content
without obligation to notify any person of such revision changes.
Contents of this pu blication m ay be prelimin ary and/or may be changed at an y time with out
notice and shall not be regarded as a warranty.
Documentation Disclaimer
TxPOR T makes no representation or war ranties of any kind whatsoe ver with respect to the
contents hereof and specifically disclaims any implied warranties of merchantability or fitness for any particular purpose.
General
1.0 Introduction
The TxPORT International 2048 PMU /NTU (Performance
Monitoring Unit /Network Terminating Unit) is an advanced
network device capable of operating in framed or multi-
framed (G.704) modes, using AMI or HDB3 line coding.
The 2048 is designed for CEPT E1 (2.048 Mb/s) connection
to the PTT (the national Postal, Telephone, and Telegraph
authority) by the user. The unit provides end -to-end inband
protocol via a selectable national bit. This allows one PMU
to interrogate and control the remote far end PMU.
The 2048 is equipped with a dual set of performance data
registers that hold line statistics for both the PTT and the
user. Each register set provides detailed status and performance history for the network and equipment interfaces.
front panel test switch activates local/remote loops and controls the internal BERT generator and comparator.
The optional EM8000 Element Manager is available for
applications requiring multiple PMUs. The EM8000 provides access, control, testing, alarm reporting, and database
management functions.
TxPORT 2048 PMU/NTU
TRANSPORT
PMU/NTU
®
2048
ACO
The PTT performance data registers may be accessed, read,
and cleared by the PTT. User registers can only be accessed
by the user. Both registers contain identical core performance information, but the user registers also contain additional fields relating to unit configuration and status.
Performance data (per TR54016 and G.821/ X) is collected
in 15- minute increments for the preceding 24- hour period
and in 24 - hour increments for the preceding 30 -day period.
The unit enables downloading of remote site performance
data from the far end PMU, in all modes of operation, using
the facility data link (user selectable national bits).
The PMU provides access to the data registers through one
front and two rear management ports. These ports provide
test, diagnostics, and control over the CEPT E1 network.
Program upgrades may be downloaded into electrically erasable memory (EPROM) in the field via the supervisory port
on the front panel.
Access can also be obtained through a data link using an
assigned national bit. The national bit data link uses the
54016 U.S. FDL TABS protocol and message set. Additional request/response FDL messages have also been added
to enhance the PMU’s operation. The TxPORT EM8000
network manage r uses these messages to provid e complete
end-to-end control and performance monitoring.
The 2048 also provides features to aid in quick fault isolation. Front panel indicators display alarm and test conditions. Test jacks allow bridged monitoring of the passed
signal and signal insertion toward the PTT or the user. A
ACO SW
BV/CR /FE
LOS/LOF
AIS
REM ALM
LOC ALM
FAR
FRM
NET
MON
TO
DTE
S
U
P
V
N
E
T
LLB
PLB
TST
ERR
4
3
2
1
MON
FRM
SW1
5
0
LOC
TO
NET
DTE
6
9
7
8
D
T
E
T
S
T
General 1-12048 PMU/NTU
1.1 Design Highlights
• End-to-end user control and access to
extensive unit performance data
unit configuration
unit status (normal, looped, alarm)
DTE Input Signal: 75 ¾ mark 2.37 V, space 0 ± 0.237 V
(per G.703) 120 ¾ mark 3 V, space 0 ± 0.3 V
attenuated by 0 to -6 dB at
1024 kHz (0 dB = 2.4 V)
Connection: 120 ¾ balanced or 75 ¾ unbalanced
• AMI or HDB3 coding
• User and PTT access via FDL link
• Dual performance registers - User and PTT/carrier
• Jitter control of network signal (per G.823)
• Complete diagnostic capabilities, including multiple
loopbacks and buil t-in BERT
• Front panel test jacks, alarm indicators, and test switch
1.2 Specifications
Network Interface
Line Rate: 2.048 Mb/s, ± 50 ppm, PCM-30
Multi-frame Type: CAS and/or CRC4, or none
Line Code: AMI or HDB3
Connection: 120 ¾ balanced or 75 ¾ unbalanced
Backplane: DB15, Twin-axial, and BNC options
Output Signal: 75 ¾ mark 2.37 V, space 0 ± 0.237 V
(per G.703) 120 ¾ mark 3 V, space 0 ± 0.3 V
Line Build Out: 0, -7.5, -1 5 dB switch settings
Input Signal: 75 ¾ mark 2.37 V, space 0 ± 0.237 V
(per G.703) 120 ¾ mark 3 V, space 0 ± 0.3 V
attenuated by 0 to -27 dB (ALBO)
Backplane: DB15, Twin- axial, and BNC options
AIS: Unframed or framed all ones, or
line loopback
Overvoltage: 1000 V minimum protection
Diagnostics
Line Loopback: Signal regeneration only
Payload Loopback: Signal regenerated with new frame
synchronization and CRC4
BERT: 63, 511, 2047, 2
BERT Activation: Front panel switch for test. User
Loopback Control: Inband loop up, 00001 for Ý 5 sec
PTT and EM8000 Full ESF performance monitoring
23
2
, QRW, and ALT
selection of BERT patterns via
command. Pattern sync and bit
errors reported via command.
Inband loop down, 001 for Ý 5 sec
User enable/disable
Manual loopback switch
FDL loopback command
through a terminal port (6-pin RJ11),
and via FDL in selected national bit
15
(default), 220,
Jitter Attenuation: per CCITT G.823
AIS: Unframed or framed all ones, or
(user selectable) line loopback
Overvoltage: 1000 V minimum protection
Equipment
Line Rate: 2.048 Mb/s, ± 50 ppm, PCM-30
Multi-frame Type: CAS and/or CRC4, or none
Line Code: AMI or HDB3
Output Signal: 75 ¾ mark 2.37 V, space 0 ± 0.237 V
(per G.703) 120 ¾ mark 3 V, space 0 ± 0.3 V
Pulse Width: 244 ns, nominal
1-2 General 2048 PMU/NTU
Interface
Access
Jack
Toward Network: Bantam jacks (In, Out, and Monitor)
Toward DTE: Bantam jacks (In, Out, and Monitor)
Access
User Net Manager: Asynchronous, RS232
Telco Net Manager: Asynchronous, RS232
Local Access: Asynchronous, RS232
Bit Rates: 1200, 2400, 9600 or 19200 b/s
(all ports) (switch selectable)
Formats: 8 data bits, 1 stop bit, no parity
Ports
Protocol: TxPORT COMVIEW (pro prietary)
!
ASCII VT100
Connection: All ports, 4-pin modular
G.732 primary PCM multiplex @ 2.048
G.821 error performance criteria
G.823 co ntrol of jitter and wander
Alarms
Contacts: Normally Open or Normally Closed
(screw terminal connection)
Activation: Programmable
Reporting: Through TxPORT EM8000 manager
Cut Off: Manual, 2-position switch
Mechanical
Mounting: Wall, vertical, or horizontal rack
Width: 1.75"
Height: 6"
Depth: 11.75"
Weight: 1 pound
Power
Local Power: -48 VDC (± 10%)
75 mA maximum
(screw terminal connection)
G.832 framing requirements
TR54016 performance data
1.3 FCC/European Requirements
WARNING: Changes or modifications to this
unit not expressly approved by the party responsible for
compliance could void the user’s authority to operate the
equipment.
FCC and European homologation pending.
This equipment generates, uses, and can radiate radio fre-
quency energy and, if not installed and used in accordance
with the instruction manual, may cause harmful interference
to radio communications. Operation of this equipment in a
residential area is likely to cause harmful interference in
which case the user will be required to correct the interference at his own expense.
Shielded cables must be used with th is unit to ensure compliance.
Battery
The unit’s configuration and operating parameters are stored
in nonvolatile RAM memory. In case of a power outage and
if the DIP switches are set to boot from RAM, then the
unit’s memory is checked upon power- up conditions. If the
RAM has been compromised, the unit’s configuration will
revert to the options set with the remaining DIP switches.
Environmental
Operating Temp: 0° to 50° C (32° to 122°F)
Storage Temp: -20° to 85° C (-4° to 185°F)
Humidity: 95% max (non-condensing)
Compatibility
G.703 signal waveform
G.704 synchronous frame structures
Backed RAM
1.4 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 user’s 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 othe r than TxPORT personnel.
When returning the unit for warranty work, a Return Material Authorization (RMA) number must be obtained from
customer service at the address/phone number shown in
Section 1.6. When calling TxPORT to obtain a Return Mate-
General 1-32048 PMU/NTU
rial Authorization number or to arrange service, please have
the following information available:
• Model number(s) and serial number(s) for the unit(s).
• Reason for return and symptoms of problem.
• Warranty status (if known).
• Purchase order number to cover charges for out-ofwarranty 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).
As soon as TxPORT has the above information, the RMA
that must accompany the item(s) returned can be issued.
1.5 Ordering Numbers
The unit is shipped from the factory with the 2048 PMU/
NTU reference manual. Refer to Table 1 -1 for optional
equipment part numbers.
The part numbers for the stand- alone unit and the modular
chassis unit are shown in the following table:
Part Number Description
Table 1-1 Optional Equipment
Part Number Description
Cables
9 - 1001 - 027- 1
9 - 1001 - 027- 2
9-1001-028-1
9-1001-028-2
9-1001-029-2 DB9 female to 6-pin RJ11 (terminal to SUPV)
9-1001-048-1
9-1001-048-2
33-00085
33-00086
F-1051-000--112 Twelve-slot 1051 chassis with RJ48C and DB25
9-2000-001--1
9-2000-001--2
9-2000-002--1
9-2000-002--2
9-2000-036--1 Stand-alone to rack mount conversion module
F-1040-000--110
9-1000-48V-1
F-1041-000--110
9-1000-48V-2
30-00087 Stand-alone wall mount power supply
9-8000-001-1
9-8000-001-2
DB25 male to 6-pin RJ11 (modem to SUPV)
DB25 female to 6-pin RJ11 (modem to SUPV)
DB25 male to 6-pin RJ11 (terminal to SUPV)
DB25 female to 6-pin RJ11 (terminal to SU PV )
DB25 male to two 6-pin RJ11 (terminal to NMS)
DB25 female to two 6-pin (terminal to NMS)
Bantam to bantam test cord - red
Bantam to bantam test cord - black
Mounting
backplane connectors
19" single unit rack mount bracket
19" dual rack mount bracket
23" single unit rack mount bracket
23" dual rack mount bracket
with DB25 to 6-pin adapter
Power
1040 power shelf (type 400 mechanics)
w/o power supplies
One -48V/2A power supply (1040 holds 2)
Redundant 1041 power shelf (type 400
mechanics) w/o power supplies
One -48V/2A power supply (1041 holds 2)
(- 4 8VDC/200mA)
Misc.
EM8000 with manua l on 3-1/2 inch disk (DOS
and UNIX version, respectively)
F-2048-100-11
C
2048 PMU/NTU stand-alone unit
C
=
Backplane option
1
with BNC connector
2
with Tri-axial connector
3
with Twin-axial connector
4
with DB15 connector
5
with BNC and DB15
1.6 TxPORT Customer Service
TxPORT
127 Jetplex Circle
Madison, Alabama 35758
T e l eph one Nu mber: 800-926-0085 or
F-2048-101-111
2048 PMU / NTU module (chassis)
205-772-3770
Sales /Administration FAX: 205-772-3388
Manufacturing FAX: 205 -772 - 8280
For example, the default part number for the stand-alone
Customer Service Returns: 800-926-0085, ext. 227
unit is ‘F – 2048– 100 – – 111’. This is a unit equipped
with BNC connectors on the backplane.
Product Technical Support (Normal Hours)
8 a.m. to 5 p.m. Central Time, Monday – Friday)
T e l eph one Nu mber: 800-285-2755 or
205-772-3770
Emergency (Nights / Weekends / Holidays)
The following accessories may also be needed for the installation and operation of the TxPORT 2048 PMU/NTU.
T e l eph one Nu mber: 800-285-2755
Internet Address: support@txport.com
1-4 General 2048 PMU/NTU
Installation
2.0 Introduction
This section contains information and instructions required
to prepare the 2048 PMU for use. Included are initial
inspection procedures, mounting instructions, configuration
guidelines, connection instructions, and powering information.
NOTE: Throughout this manual, all factory default
settings will be underlined
.
2.3 Supplied Materials
The TxPORT 2048 PMU /NTU is shipped from the factory
with the following equipment:
• 2048 PMU with 19" mounting brackets attached
• 2048 PMU Reference Manual
The user may also require the following additional materials
for the installation and operation of the 2048 PMU.
• -48 VDC power source
• A wall transformer to provide 110 VAC to -48 VDC
local power
• Network and DTE interface cables
2.1 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.
!
The WARNING sign denotes a 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.
NOTE: Follow the proper ESD (electrostatic device)
procedures while handling the circuit boards.
2.2 Unpacking and Inspection
This unit is carefully packaged to prevent damage in shipment. Upon r eceipt, ins pect th e shipping contai ner for damage. If the shipping container or cushioning material is
damaged, notify the carrier immediately 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.
If the contents of the shipment are incomplete or, if there is
mechanical damage or defect, notify TxPORT. If the shipping container is also damaged, or the cushioning material
shows signs of stress, notify the carrier of the damage as
well as TxPORT. Keep the shipping materials for carrier’s
inspection. TxPORT will arrange for repair or replacement
without waiting for claim settlement.
• 20-gauge stranded wire (or similar) for DC power
and alarm connection
For specific applications, the user may require additional
cables and adapters. The interface requirements of any
application may be met by using the appropriate cable. Standard cables an d ord ering n umber s are lis ted in Table 1 -1 on
page 1-4. Contact TxPORT for any needed assistance in
cable selection.
2.4 Mounting
The 2048 PMU is a modular unit that plugs in to eith er a single unit housing or into a chassis that holds up to 12 units.
Single units are designed for stand - alone desktop use, wall
mounting, or chassis mounting (in either a vertical or horizontal orientation). The unit uses an interchangeable front
panel to accommodate the chassis card cage.
The unit utilizes an interchangeable backplane to accommodate the nest mount card cage and, when used in the single
unit housing, to provide various connector types for differing application requirements. Backplane options for the
2048 include DB15, Twin-axial, and BNC connectors.
2.4.1 Stand-alone Unit
To access the circuit boards and configuration switches, perform the following steps: Open the front panel access door
and remove it by gently bending the plastic from th e middle
using both hands. Then pull the two side strips of plastic
from the middle outwards until the four stops are clear of
the front panel. Pull the cover off the front panel. Then
remove the 2 screws and pull the front panel and circuit
boards out of the housing. Observe proper electrostatic
device handling procedures while holding the circuit boards.
Installation 2-12048 PMU/NTU
Figure 2-1 Circuit Board Views
0
1
9
2
8
3
7
6
4
5
2048
rear
Switch S1
-15 -7.5 0
The stand -alone unit may be used in a chassis installation
with the following modifications: Remove the housing as
described above and then remove the four screws holding
the front panel to the circuit boards. Replace the stand -alone
front panel with a module type front panel. The unit will
now slide into one of the 12 slots in the chassis.
2.4.2 Chassis Assembly
Up to 12 units may be inserted in to a chass is and the ch assis
may be installed in a 19" or 23" rack using four screws.
Connections are made from the rear of the chassis. Refer to
the figures on page 2-10 for these illustrations.
Switch S6Switch S5Switch S4Switch SW2
NORM RACK
Switch S7
1234567
Switch S2
8123456781234567812345678
2048
rear
tern as determined by rotary switch SW1 (refer to the following table). This switch is located on the front panel
(shown on page 3-1).
Pos
Pattern
PROM Downloading Procedures:
0 12345 6 7 9
QRW 2
729215220223
1:8 3:24 PROM
Rotary switch SW1,
position 9 is used to download new PMU operating firmware into the flash memory. This operation requires a PC
and a diskette which contains TxPORT’s downloading program (
download.exe
) and the hex file to be downloaded.
Downloading procedures are described in the 2048 Download Procedures document sent with the software.
2.5 Unit Configuration
2.5.2 Switch SW2 (National Bit)
The 2048 PMU model is designed as a two card set. The
two cards roughly divide into analog and digital functions.
The unit provides an interface to the network in compliance
with established standards. It has been designed to operate
either manually or through the use of a console/terminal.
Therefore, the unit has both hardware and software configuration settings.
This following paragraphs explain the various hardware
configurations that may be adjusted for unique applications.
Software controlled settings are discussed i n the Operations
section of this manual.
2.5.1 Switch SW1 (BERT Pattern)
When the PMU is instructed to send a test pattern by the test
switch (FAR/LOC) on the front panel, it will send 5 seconds
of inband loop code (10000) and then transm it the test pat-
2-2 Installation 2048 PMU/NTU
Rotary switch SW2 is used to select th e National Bit. The
following table shows the switch positions. The factory
default is position 1.
Pos
NB
01
N/A 1
2345678 9
23454 4 4 4
Switch S6 has two positions affecting the optio ns fo r Switch
SW2. For position S6- 7, Down = ‘Pass’
and Up = ‘Select’.
For position S6 -8, select eith er ‘Down’ (0) or ‘Up’ (1) for
National Bit data (applies only if position S6-7 is set for
‘Select’). Switch S6 is cov ered in Sectio n 2.5.7 on pag e 2-4.
2.5.3 Switch S1 (Network LBO)
The output signal level of the transmit data (TXD) from the
2048 PMU to the network must be set by the LBO switch
located on the bottom of the PC board (refer to the bottom
7654321 8
Dn Up
Ones Polarity
1
IBLC
Enable
Signal
CAS
Code
HDB3
CRC4
Enable
AIS / KA
AIS / KA
Insert CRC
Disable
Ones Polarity0IBLC
Disable
Signal
CCS
Code
AMI
CRC4
Disable
AIS / KA
AIS / KA
Insert CRC
Enable
Switch
S5
circuit board view in Figure 2-1).
The output level is factory set at 0 dB
. It may be attenuated
by -7.5 dB or by - 15 dB if operating conditions require that
it be changed. The PTT should provide the proper setting to
the user.
If unsure of the exact setting, then slide to 0 dB.
AIS: Unframed all ones
Keep Alive: AIS
BERT Ones polarity: 1 (normal)
National Bit Position: 4
National Bits: Pass
BERT Polarity: Normal
2.5.4 Switch S2 (Chassis Operation)
Switch S2 is used to swap the DTE transmit and receive pair
(Tx/Rx) for either normal stand-alone use or for rack mount
2.5.6 Switch S5 (Configuration)
DIP Switch S5 is used to set the following configuration
parameters on the 2048 unit.
use. It is located on the bottom of the PC board (refer to the
bottom circuit board view in Figure 2-1).
2.5.5 Switch S4 (Configuration)
During initial power up, four modes of configuring the 2048
are available using the first two positions of DIP Switch S4.
Switch
7654321 8
Dn Up
Spares
Pos 1 Pos 2 Power Up (Boot) Mode
Dn
Dn Up Boot from Manager
Up Dn Boot from RAM
Up Up Boot from ROM
Dn Boot from Switches
S4
One’s Polarity: Position S5-1 sets the bit error rate test
(BERT) data ones polarity to either a 1 or 0.
: ‘1’ Up: ‘0’ (Inverted)
Down
IBLC: P osition S5-2 enables inband 5-b it (10000) loop up
code and 3-bit (100) loop down code detection.
:Enabled Up:Disabled
Down
1) Boot from switch settings: Upon reset, the unit reads
its configuration from the hardware switch settings
described in this chapter.
Line Framing: Position S5- 3 is used to m atch th e PM U to
the framing format used. The options are CAS
(Channel
Associated Signalling) or CCS (Common Channel Signal-
2) Boot from manager: Upon reset, the unit requests configuration information from the EM8000 element manager.
If the manager is not on-line, the unit will boot from RAM.
3) Boot from RAM: Up on reset, the unit reads its configuration from the internal, battery-backed RAM.
4) Boot from ROM: Upon reset, the unit reads its configuration from the internal ROM. The ROM factory default settings are as follows:
ling). CAS is also referred to as PCM30, (or CAS Multiframe). CAS framing also includes an additional FAS sync
word in time slot 16, frame 0.
Down
: CAS Up: CCS
CCS is also referred to as PCM31 (or no Multiframe). It
contains alternating aligned frames and non-aligned frames.
If the PMU is configured for CCS, it will pass both CCS and
CAS framing data. In this case, the additional FAS sync
word in the CAS mode is passed as data and the PMU does
Signalling: CAS
Network CRC4: Enabled
DTE CRC4: Enabled
Line Code: HDB3
Inband Loop Code: Enabled
not try to sync on the additional sync word.
If CAS framing is used, then a more rigid sync and error
detection is used by the PMU. If CAS is selected, the PMU
expects CAS framing. If CCS framing is used, the PMU
declares an out of sync condition and transmits the Keep
Installation 2-32048 PMU/NTU
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