Loop Telecom Loop-V 4100 User manual

Loop-V 4100 Controller
User’s Manual
LOOP TELECOMMUNICATION INTERNATIONAL, INC.
8F, NO. 8, HSIN ANN ROAD
SCIENCE-BASED INDUSTRIAL PARK
HSINCHU, TAIWAN
Tel: [phone]
Fax: [phone]



2004 Loop Telecommunication International, Inc. All rights reserved.
P/N: 51.LV4100.100
01/2004 Version 1.6

Table of Contents
1 PRODUCT DESCRIPTION.....................................................................................................................1-1
1.1 Overview...................................................................................................................................1-1
1.2 Applications...............................................................................................................................1-2
1.2.1 OC3/STM1 Multi-Service Drop (DS3) with DS0 Digital Cross-Connect..................................1-2
1.2.2 OC3/STM1 Multi-Service Drop (E3) with DS0 Digital Cross-Connect..................................... 1-2
1.2.3 OC3/STM1 DS1 Drop with DS0 Digital Cross-Connect...........................................................1-3
1.2.4 63 E1.........................................................................................................................................1-4
1.2.5 84 T1.........................................................................................................................................1-4
1.3 Specifications............................................................................................................................1-5
2 INSTALLATION.......................................................................................................................................2-1
2.1 Site Selection............................................................................................................................ 2-1
2.2 Configuration Setting ................................................................................................................2-1
2.3 Mechanical, Electrical and CPU Board Installation................................................................... 2-2
2.3.1 Mechanical Installation.............................................................................................................. 2-2
2.3.2 Electrical Connections ..............................................................................................................2-3
2.3.3 CPU Connection .......................................................................................................................2-4
2.4 Terminal Connection................................................................................................................. 2-4
2.5 Connection................................................................................................................................2-5
2.5.1 Connectors................................................................................................................................2-5
2.1.1 SCSI-68 Connectors, BNC Panels, and optional RJ Panels.................................................... 2-5
2.5.3 Console Port Connector............................................................................................................2-6
3 OPERATION ...........................................................................................................................................3-1
3.1 Quick Start ................................................................................................................................3-1
3.2 Power On..................................................................................................................................3-1
3.3 Self Test....................................................................................................................................3-1
3.4 Using a Terminal.......................................................................................................................3-1
3.5 System Operation .....................................................................................................................3-1
3.5.1 Protection..................................................................................................................................3-1
3.5.2 Date .........................................................................................................................................3-2
3.5.3 Master Clock.............................................................................................................................3-2
3.5.4 Console Port .............................................................................................................................3-2
3.5.5 Logon, Logoff and Password....................................................................................................3-3
3.6 Configuration............................................................................................................................. 3-3
3.7 Time Slot Interchange (Digital Access Cross-Connect)............................................................3-3
3.8 Alarms and Reports ..................................................................................................................3-5
3.9 LED Operation ..........................................................................................................................3-6
3.10 SNMP Connection.....................................................................................................................3-7
3.11 Verifying Loop-V 4100 Operations............................................................................................3-8
3.11.1 Quick Test.................................................................................................................................3-8
3.11.2 Using Hardware Loopback........................................................................................................3-8
3.11.3 Loopback Block.........................................................................................................................3-9
3.12 Firmware Download................................................................................................................3-11
3.13 Alarm Setup ............................................................................................................................3-11
4 FRONT PANEL OPERATION.................................................................................................................4-1
5 TERMINAL OPERATION........................................................................................................................5-1
5.1 Controller Configuration............................................................................................................5-2
5.1.1 System Configuration................................................................................................................5-2
5.1.2 Clock Source Setup ..................................................................................................................5-3
5.1.3 TSI Map.....................................................................................................................................5-3
5.2 Information Summary................................................................................................................5-4
5.3 Alarm Queue Summary ............................................................................................................5-5
5.4 Controller Setup........................................................................................................................5-6
5.4.1 System Setup............................................................................................................................ 5-6
5.4.2 Clock Source.............................................................................................................................5-8

5.4.3 TSI Map.....................................................................................................................................5-8
5.4.4 Select a new TSI Map...............................................................................................................5-9
5.4.5 Copy a TSI Map to Another ....................................................................................................5-10
5.4.6 Clear a TSI Map......................................................................................................................5-11
5.4.7 Priority Setup...........................................................................................................................5-12
5.5 Password Setup......................................................................................................................5-12
5.5.1 System Password Setup.........................................................................................................5-13
5.5.2 TSI Password Setup ...............................................................................................................5-13
5.6 System Alarm Setup ...............................................................................................................5-14
5.7 File Transfer............................................................................................................................ 5-14
5.7.1 Download Firmware................................................................................................................5-15
5.7.2 Upload Firmware.....................................................................................................................5-16
5.7.3 Download Configuration..........................................................................................................5-16
5.7.4 Upload Configuration..............................................................................................................5-17
5.8 Store / Retrieve Configuration.................................................................................................5-20
5.8.1 Store Configuration................................................................................................................. 5-21
5.8.2 Retrieve Configuration ............................................................................................................5-21
5.9 Alarm Cutoff............................................................................................................................5-22
5.10 Clear Alarm Queue.................................................................................................................5-23
5.11 Controller Reset......................................................................................................................5-23
5.12 Load All Ports Default .............................................................................................................5-24
6. 2 Controller Return to Default....................................................................................................5-25
6 Appendix A: Firmware Download Procedure ..........................................................................................6-1
6. 2 Normal Download Procedure.................................................................................................... 6-2
6.1.1 Downloading to Dual CPUs ....................................................................................................6-13
6. 2 Procedure for reverting to the previous version of firmware:.................................................. 6-16

List of Tables
Table 2- 1 Power Connector..................................................................................................................2-3
Table 2- 2 Ethernet Port.........................................................................................................................2-4
Table 2- 3 DB9 Console Port (Loop-V 4100)........................................................................................ 2-6
Table 3- 1 Protection Ports....................................................................................................................3-2
Table 3- 2 Console Port Settings...........................................................................................................3-2
Table 3- 3 Performance Report Options................................................................................................3-5
Table 3- 4 Control Panel LED Table......................................................................................................3-6
Table 3- 5 High Density E1 LED Table..................................................................................................3-6
Table 3- 6 OC3/STM-1 LED Table.........................................................................................................3-6
Table 3- 7 DS3.......................................................................................................................................3-6
Table 3- 8 E3..........................................................................................................................................3-6
List of Figures
Figure 1- 1 OC3/STM1 Multi-Service Drop (DS3) with DS0 Digital Cross-Connect............................. 1-2
Figure 1- 2 OC3/STM1 Multi-Service Drop (E3) with DS0 Digital Cross-Connect ............................... 1-3
Figure 1- 3 OC3/STM1 DS1 Drop with DS0 Digital Cross-Connect.....................................................1-3
Figure 1- 4 63 E1 ..................................................................................................................................1-4
Figure 1- 5 84 T1...................................................................................................................................1-4
Figure 2- 1 Controller Hardware Jumper Selection Diagram.................................................................2-1
Figure 2- 2 Front View of the Loop-V 4100............................................................................................ 2-2
Figure 2- 3 Rear View of the Loop-V 4100 ............................................................................................ 2-3
Figure 2- 4 BNC Panel...........................................................................................................................2-5
Figure 2- 5 21 E1 RJ45 Panel................................................................................................................2-6
Figure 2- 6 28T1 RJ45 Panel.................................................................................................................2-6
Figure 3- 1 SNMP Connection...............................................................................................................3-7
Figure 3- 2 Loopback Block Diagram ....................................................................................................3-9
Figure 5- 1 1:1 (Bidirection) TSI Mapping.............................................................................................. 5-7
Figure 5- 2 1:N Multicast TSI Mapping ..................................................................................................5-7

Chapter 1 Product Description
1-1
1 PRODUCT DESCRIPTION
1.1 Overview
The Loop-V 4100 Universal Multiservice Access Platform is a cross-connect device which connects E1
to the OC3/STM-1 network. When used with STM1 and DS3 linear networks the Loop-V 4100 could provide
full STM1 access, OC3 access, and OC3Add-drop. The OC3/STM-1 port could be connected to OC3/STM-1
networks or to Loop-V4200-28 with OC3/STM-1 port. The LOOP-V 4100 has full DS0 cross-connect built
inside. The A-µconversion is also supported. Three DS3 ports could be connected to DS3 networks or to a
Loop-V 4200-28 with a DS3 port. E3 could be connected to E3 networks or to a Loop-V 4200-28 with an E3
port. 21E1 could be connected to the E1 network. 28T1 could be connected to the T1 network.
Local control and diagnostics could be supported by using a VT100 terminal connected to the console port.
The LOOP-V 4100 also supports Ethernet, Telnet, and SNMP, so that it can be controlled and diagnosed
from remote locations.
Data from any port, or any time slot of that port, can be channeled to any port or any time slot of any other
port. Digitized voice will be appropriately converted between A-law and µ-law. Channel associated signaling
will be appropriately converted between E1 and T1 formats.
The main chassis, which is a 5U high, rack-mountable box, has one slot reserved for the main controller
boards, four slots reserved for OC3/STM-1, six slots reserved for DS3, E3, HD_E1 and HD_T1 ports, and
three slots used for circuit board protection
The main features of the LOOP-V 4100 are:
!Used with STM-1 and DS3 linear network
!Different plug-in types
a. DS3
b. E3
c. Circuit protection board for DS3, E3.
d. High density 21E1
e. High density 28T1
f. STM-1/OC3
!DS0 Digital cross-connect between plug-in ports
!A ∼µsignaling conversion
!Alarm relay
!Console port, Ethernet, and SNMP
!LED indicators for each port on the front and back sides of the shelf
!AC or DC redundant power module
!In-band management, out-band management
!Redundant TSI, power and control boards
!Up to 17 slots for different plug-ins
!Support for OC3/STM-1 1+1 line protection
!Support for DS3 1+1 line and circuit protection
!Support for E3 1+1 line and circuit protection
!Size- 17.25” (W) x 8.67” (H) x 9.84” (D) (438mm x 220 mm x 250 mm)
!Power consumption: ~70W nominal

Chapter 1 Product Description
1-2
1.2 Applications
1.2.1 OC3/STM1 Multi-Service Drop (DS3) with DS0 Digital Cross-Connect
In this application all optical ports have 1+1 protection. The V4100 could have up to three DS3 drops. Any
DS0 inside any DS3 or STM1 port could be cross-connected to any other DS0 inside any DS3 or STM1 port.
Figure 1- 1 OC3/STM1 Multi-Service Drop (DS3) with DS0 Digital Cross-Connect
1.2.2 OC3/STM1 Multi-Service Drop (E3) with DS0 Digital Cross-Connect
In this application all optical ports have 1+1 protection. The V4100 could have up to three E3 drops. Any
DS0 inside any E3 or STM1 port could be cross-connected to any other DS0 inside any E3 or STM1 port.
Loop-V 4200-28
Loop-V 4100
...
T1/ E1
V.35
Router
OC3/STM1
1+1
Protection
DS3
OC3/STM1
OC3/STM1
OC3/STM1 1+1
Protection
DS3DS3
OC3/STM1 Multi-Service Drop with DS0 Digital Cross Connect

Chapter 1 Product Description
1-3
Figure 1- 2 OC3/STM1 Multi-Service Drop (E3) with DS0 Digital Cross-Connect
1.2.3 OC3/STM1 DS1 Drop with DS0 Digital Cross-Connect
All optical ports in this application have 1+1 protection. The V4100 could have up to three E1 drops instead
of DS3 drops. The application is intended to allow any 28 T1s or 21 E1s inside any DS0 port or STM1 port
to cross-connect with any other T1s or E1s inside any DS0 or STM1 port.
Figure 1- 3 OC3/STM1 DS1 Drop with DS0 Digital Cross-Connect
Loop-V 4100
OC3/STM1
1+1
Protection
63 E1 / 84T1
OC3/STM1
OC3/STM1
OC3/STM1 1+1
Protection
OC3/STM1 DS1 Drop with DS0 Digital Cross Connect
. . . . .
Loop-V 4200-28
Loop-V 4100
...
T1/ E1
V.35
Router
OC3/STM1
1+1
Protection
E3
OC3/STM1
OC3/STM1
OC3/STM1 1+1
Protection
E3E3
OC3/STM1 Multi-Service Drop with DS0 Digital Cross Connect

Chapter 1 Product Description
1-4
1.2.4 63 E1
If there are no OC3/STM1 optical cards in the V 4100, the E1 cross-connect will allow up to 63 E1s to be
cross-connected.
Figure 1- 4 63 E1
1.2.5 84 T1
If there are no OC3/STM1 optical cards in the V 4100, the DS1 cross-connect will allow up to 84 T1s to be
cross-connected.
Figure 1- 5 84 T1
Loop-V 4100
63 E1
E1 Cross Connect
. . . . .
Loop-V 4100
84 T1
DS1 Cross Connect
. . . . .

Chapter 1 Product Description
1-5
1.3 Specifications
The specifications of the Loop-V 4100 are listed below:
!Time slot interchange
Less than 700µs delay
One active map, 3 user stored maps
!Voice channel conversion
A- law to µ-law G.711
CAS signaling transparent(A=0 from E1 becomes A=0 to T1, etc.)
!Electrical power
Field changeable AC or DC, single or dual module, including AC and DC mixed
DC: -48 Vdc
AC: 90 to 240 VAC, 50/60Hz
!Performance monitor
Performance store The last 24 hours performance in 15-minute intervals
Monitor registers Line and User
Performance reports Date &time, error second, degraded minutes, unavailable second, bursty
error second, severe error second, and controlled slip second
Alarm history Date & time, alarm type(i.e. master clock loss, RAI, AIS, LOS, BPV, ES,
CSS)
Threshold BPV (Bipolar Violation), Error Second, Unavailable Second,
Controlled Slip Second
!Ethernet
Connector RJ45
Protocol Telnet and embedded SNMP
!Diagnostics test
Loopback Line loopback, payload loopback and local loopback

Chapter 2 Installation
2-1
2 INSTALLATION
2.1 Site Selection
The Loop-V 4100 was designed to be used as a stand alone or rack-mounted device.
2.2 Configuration Setting
Figure 2-1 below illustrates the Loop-V 4100 Controller Hardware jumper selection.
Figure 2- 1 Controller Hardware Jumper Selection Diagram
CTRL Interface
J1
JUM1
JUM3
JUM2
OFF ON
JUM1 No
ground Normal Operation
(to ground)
JUM2 Normal
Operation Bank changes on system
restart
JUM3 --- V4100

Chapter 2 Installation
2-2
2.3 Mechanical, Electrical and CPU Board Installation
2.3.1 Mechanical Installation
The LOOP-V 4100‘s dimensions are: 17.25”/ 438mm (W) x 8.67”/ 220mm (H) x 9.84” /250mm (D).
2.3.1.1 Front View
The front view of Loop-V 4100 is shown in the following figure.
Two LEDs at the top of the front panel on are for indicating the status of two power modules. Four LEDs in
columns 1-6 are for indicating the status of the DS3, E3, HD_E1 and HD_T1 modules. Three LEDs in
columns 7 and 8 are for indicating the status of the two main controller boards. Four LEDs in columns 9-12
are for indicating the status of four OC3/STM1 cards.
Figure 2- 2 Front View of the Loop-V 4100
2.3.1.2 Rear View
The Rear view of Loop-V 4100 is shown in the following figure. There are 17 slots for different plug-in cards.
Slot positions on ports A(M), A(S), B(M), B(S), C(M) and C(S) are used to plug in DS3, E3, HD_E1 and
HD_T1 cards. Slot positions on port A(SW), B(SW) and C(SW) are used to plug in DS3/E3 circuit protection
cards. Ports CR1and CR 2 are used for main controller boards. Ports D(M), D(S), E(M), and E(S) are used
to plug in OC3 cards.
1+1 line protection is available for the STM-1/OC3 function when Port D(M) is backed up by Port D(S) and
Port E(M) is backed up by Port E(S).
HD_E1 and DS3/E3 1+1 line protection is available when Port A(M) is backed up by Port A (S), Port B(M) is
backed up by Port B(S) , and Port C(M) is backed up by Port C(S). Please note that with HD_E1, if one of
the 21 E1 lines is switched over from the working port to the backup port all 21 lines will be switched over.

Chapter 2 Installation
2-3
DS3/E3 circuit protection is available with the main ports (ie. A(M), B(M), C(M) ) of the port pairs being
switched by ports A(SW), B(SW) and C(SW) to the corresponding secondary (backup) ports A(S), B(S), C(S).
"#
$#
Figure 2- 3 Rear View of the Loop-V 4100
2.3.2 Electrical Connections
Either AC power or DC power will be used, depending on the model ordered. Power connection is at the rear
of the unit. For the AC model, a power cord is supplied. For the DC model, -48 Vdc power is inserted via a 3-
pin terminal block. Table 2-1 lists the pin definition for this power connector.
Table 2- 1 Power Connector
Pin Number Signal Description
1 -V -DC 48 Volts
2 +V +DC Return
3 Chassis Ground
If the dual module, dual feed power supply option is to be installed, independent power feeds must be wired
to the power supply card. With dual feed, if any one power source fails, or if any one power module fails, the
remaining functions of the unit will continue. If only one power feed is used, the advantage of a dual power
module is still available. One LED for each power module indicates the status of that power module. When
one power module has failed, a scheduled replacement of the entire module is necessary.
The Loop-V 4100 is designed to allow for "hot plug-in" or “hot-swapping” of modules. This means that
interface cards can be inserted and removed with the main chassis powered up. Onreplacement of a plug-in
card, the previous configuration of the port will be used if the replaced card is of the same type. Otherwise,
the factory default configuration for that card type will be used. The configuration must be changed from the
default if a different card type is inserted.

Chapter 2 Installation
2-4
2.3.3 CPU Connection
The Loop-V 4200-28 can support two CPU boards for redundancy. These two boards are placed in the slots,
located in the rear of the chassis, marked “CR 1” and “CR 2”. When the system starts, one CPU board will
automatically become the primary unit, and the other will become the redundant.
Once this is determined, the redundant board will synchronize with the primary. The synchronization process
copies the user-stored configuration from the primary to the redundant board’s flash ROM. Though this
procedure takes only a few seconds, it is important that no modules be removed or installed during
this process.
CPU Boards can be removed or installed at any time. If the primary CPU board is removed, the system will
automatically switch to the redundant, and if a new unit is placed in its position, that new unit will synchronize
to the new primary and remain the new redundant CPU board. If the redundant CPU board is removed, and
replaced, the new board will synchronize with the primary unit, and there is no change in service. However, if
a primary CPU board fails, and command is switched to the redundant, or is removed, interruption in service
will occur.
NOTE: When control changes to the redundant CPU board, an interruption in service will take place.
NOTE: When the redundant CPU board is performing the synchronization process, do not add or remove
modules.
2.4 Terminal Connection
A VT100 type terminal can be connected for maintenance and administration using the console port with a
DB9 connector, located on the front of the unit. If ordered with the SNMP Ethernet option, management from
a Telnet or Network Management System (NMS) can be effected through a LAN.
The Ethernet port can be accessed via an Ethernet 10-Base-T interface. Pin definitions are listed in Table 2-2
below.
Table 2- 2 Ethernet Port
Pin Number Signal Description
1 TPTX+ TP Driver Output
2TPTX-
3 TPRX+ TP Receive Input
6TPRX-
7 Chassis GND
8 Chassis GND
The console port is configured as a DCE (data circuit-terminating equipment) device. It is designed to match
the DB9 PC COM PORT of most lap-top computers. Pin definitions are listed in Table 2-3 in the following
section.

Chapter 2 Installation
2-5
2.5 Connection
2.5.1 Connectors
The Loop-V 4100 has different connectors for the different ports: OC3/STM1, DS3, E3, HD_E1, HD_T1,
Ethernet, and console.
OC3/STM-1: SC, ST or FC-PC, BNC
DS3: BNC
E3 BNC
Ethernet: RJ45
Console: DB9
HD_E1 SCSI 68
HD_T1 SCSI 68
2.1.1 SCSI-68 Connectors, BNC Panels, and optional RJ Panels
Special cables with SCSI-68 connectors are used to connect HD_T1 and HD_E1 cards to their respective
panels. These cables are 60 cm. in length. The HD_T1 card connects to a RJ Panel. The HD_E1 card will
connect to either a RJ Panel or a BNC Panel.
Figure 2-4, below, illustrates a BNC Panel.
Figure 2- 4 BNC Panel

Chapter 2 Installation
2-6
Figures 2-5 and 2-6 below illustrate RJ45 Panels.
Figure 2- 5 21 E1 RJ45 Panel
Figure 2- 6 28T1 RJ45 Panel
2.5.3 Console Port Connector
The console port is a DB9 configured as a DCE to mate with IBM compatible portable PC with DB9
communications port configured as DTE.
Table 2- 3 DB9 Console Port (Loop-V 4100)
Pin Number Signal Source
1 Data Carrier Detect DCE
2 Receive Data DCE
3 Transmit Data DTE
4 Unassigned
5 Signal Ground
6 Data Set Ready
7 Unassigned
8 Unassigned
9 Unassigned

Chapter 3 Operation
3-1
3 OPERATION
This chapter describes the configuration options and operational functions. Refer to Chapter 5: Terminal
Operation for detailed operational procedures of the main unit. Each module also has operational
descriptions in their respective manuals.
3.1 Quick Start
This quick start section is provided to give a brief overview so operation can begin immediately.
3.2 Power On
Turn power on by attaching a power cable to the rear of the unit. The unit is shipped with factory default
setting.
After power up, factory defaults can be restored to the main unit itself and to the ports. To restore the factory
default to the main unit, use the Y-command. To restore the factory default to the ports (all at once), use the
K-command.
3.3 Self Test
At system power up, a complete self-test routine is run to check all I/O ports, read/write memory, and data
paths to validate system integrity. During the system self test, the Power LED on the CPU card will flash
indicating that a self-test is underway.
3.4 Using a Terminal
To use the RS232 interface to configure the unit, connect a VT100 terminal to the DB9 jack, marked Console.
The VT100 terminal can also be a PC running a VT100 emulator software. The CONSOLE port is
configured as a DCE device.
Upon connection, press ENTER and ESC alternately to bring the main menu into view. Then, refer to the
instructions in Chapter 5: Terminal Operation.
Use "I" command to get the card status. Press "H" followed by the slot number to choose a unit.
3.5 System Operation
3.5.1 Protection
There are several protection, or backup, options available, including redundant power supply, redundant
CPU/cross connect core, redundant Broadband, and low speed port protection.
When two power supplies are installed, which can be a mix of AC and DC, the power is protected, and the
load is shared between the two power supplies. When one fails, the other will take up the full load. The failed
unit can then be replaced by a good unit without disrupting normal operations. See Section 2.3.2 for more
information.
When two CPU boards are installed, the CPU and the switching matrix (time slot interchange) are protected.
At startup, one CPU board will assume the primary mode, and the other will be the redundant. The two
boards continually exchange status information. When the redundant board determines that the primary has
failed, it will take over control. When the failed board is replaced, the new board will assume the redundant
mode. See Section 2.3.3 for more information.
If two broadband modules are used (STM1, DS3, etc), they protect one another in one of two methods: span
protection and circuit protection. In span protection, a line to the network must be maintained to each module,

Chapter 3 Operation
3-2
one of which will be the primary, and the other the secondary. When the system determines that the primary
module (or span) has failed, it will automatically switch to the secondary. In circuit protection, a switching
card is used between the two modules. The span is connected to the switching card, which transfers the data
to the primary module. When the switching card determines that the primary module has failed, it will switch
the data stream to the secondary. In addition, the switching card continually checks the secondary module
for status and an alarm will be triggered if the secondary is determined to have failed.
Table 3- 1 Protection Ports
Protection Port A(SW) B(SW) C(SW) D(SW) E(SW)
Protected Port A(M) B(M) C(M) D(M) E(M)
Protected Port A(S) B(S) C(S) D(S) E(S)
3.5.2 Date
The main chassis is equipped with a Real Time Clock (RTC). The current date and time can be changed as
necessary. The RTC is activated by the manufacturer before shipping. The RTC
3.5.3 Master Clock
The Loop-V 4100 has a system clock Phase Lock Loop (PLL), which may be phase locked to the internal
clock, an external clock, or the OC3/STM1 and High Density E1 card’s clock inputs. The external clock
follows ITU G.703 specifications, which is either a 2.048 MHz or a 1.544 MHz AMI signal (external clock
frequency specified on order).
The default clock configurations are as follows: (a) master clock, (b) second clock (c) current clock, (d) clock
recover. When the master clock source is lost, the system will automatically switch to the second clock
source.
The secondary clock is used to provide an alternative clock source when the primary clock source is
lost, the current active clock source is shown by the terminal S-command. If the second clock source
is lost as well, the Loop-V 4100 will automatically switch to the internal clock source.
If clock recover mode is manual, the Loop-V 4100 will not automatically return to the master clock source
when the master clock source returns. In order to switch back to the master clock source, the clock must be
reselected as the master clock source via the terminal using the S-command.
If clock recover mode is automatic, the Loop-V 4100 will return to the master clock source one minute after
the master clock is recovered. The current active clock source is automatically changed to master clock.
3.5.4 Console Port
The console port allows usage of a local VT-100 terminal for system configuration, diagnostics, polling status
reports, etc. The console port baud, data bit length, stop bit length, parity bit length, XON-XOFF flow control,
and interface type defaults, are shown below.
Table 3- 2 Console Port Settings
Item Fixed Setting
Baud 9600
Data Length 8-bits
Stop Bit 1-bit
Parity Bit NONE
XON-XOFF XOFF
Interface DCE

Chapter 3 Operation
3-3
3.5.5 Logon, Logoff and Password
Logoff prevents system configuration changes at the terminal, while logon allows system configuration
changes. The password feature is used to augment lock control against unauthorized terminal users from
changing system parameters from the terminal. With the password enabled, logon requires entering the
correct password. If password is disabled, no password is required to logon.
The default option of the password is disabled.
The default password is LOOP.
3.6 Configuration
Current configurations can be stored into a non-volatile memory. This allows the ability to retrieve the last
stored configuration as well as set to this configuration after a reset/restart. Except for the time slot
interchange configuration described below, which is part of the main chassis, all other configurations refer to
the plug-in cards, which are operative only when one or more cards of those types are installed.
3.7 Time Slot Interchange (Digital Access Cross-Connect)
An important function of the Loop-V 4100 is Time Slot Interchange (TSI), also known as Digital Access
Cross-connect System (DACS), where each DS0 time slot of any line can be assigned to any DS0 time slot
of any line including itself. The assignment table is called a map. A map contains the DS0 time slot
assignments of all time slots for all lines. An idle code is transmitted on all unused time slots. The default
DS0 time slot assignment of all ports is idle channel. When a time slot is assigned to itself, for example A(M)
to A(M), a loopback of that time slot towards the line results.
In the case of a data type plug-in card, the data can be assigned to as many DS0 time slots as the data rate
requires. These DS0 time slots must be assigned to the same port, though not necessarily contiguous DS0
time slots of that port.
In the case of a data type plug-in card, the data can be assigned to as many DS0 time slots as the data rate
requires. These DS0 time slots must be assigned to the same port, though not necessarily contiguous DS0
time slots of that port.
NOTE: The payloads from an original source must be kept in a group in their original order when they are
mapped or the data will not arrive in the correct order.

Chapter 3 Operation
3-4
The following diagram shows data payloads from remote units being mapped to a Loop-V 4100 which will
map them on to another part of the network. The payloads are kept grouped together with their individual
components in their original order.
In the following diagram the DTE payload information is not kept in a group. This is unacceptable. The DTU
mapping is fine because those payload components are kept in their original group.
The Loop-V 4100 has four maps, each of which can be modified at any time. However, the "working map"
needs to be selected through a command, and then that map will be the current, active map. When the
"Store" command is used, all four maps are stored. When the "Retrieve" command is used, all four maps are
retrieved, but the map previously set as the active map will be set as the current active map.
Loop-V 4100
Targeted E1/T1 time slots
13221


13254
........
Original time slot order
Loop-V 4100
Targeted E1/T1 time slots
132
132
........
Original time slot order
Targeted E1/T1 time slots
12


12
........
Original time slot order
Remote DTE
Payload
DTU
DTE
Remote DTU
Payload
123
..............
123
..............


12
...................


12
...................
Remote DTE
Payload
DTU
DTE
Remote DTU
Payload
123
..............
123
..............




12
...................


12
...................
Loop-V 4100
Targeted E1/T1 time slots
12
12
........
Original time slot order
Targeted E1/T1 time slots
123




........
Original time slot order
312
Remote DTE
Payload
DTU
DTE
Remote DTU
Payload
123
..............
123
..............


12
...................




12
...................