( +886-3-578-7696

+886-3-578-7695

• 1997 Loop Telecommunication International, Inc. All rights reserved.

1. P/N: 51.C34871.547

8/29/97 version 1.01

1. TABLE OF CONTENTS

__________________________

1. OVERVIEW

1.1 Description

1.2 Physical Description

1.3 Applications

1.4 Configuration Settings

2. OPERATION

2.1 System Operation

2.2 Time Slot Interchange (Digital Signal Cross-Connect)

2.3 DS1 Network Line Configuration

2.4 Alarm and Reports

2.5 LED Operation

2.6 Error Message

2.7 Embedded SNMP Agent (Optional)

3. MAINTENANCE

3.1 Self-Test

3.2 Diagnostics

3.3 Near End Loopback

3.4 Far End Loopback

3.5 Test Patterns

4. FRONT PANEL OPERATION

5. TERMINAL OPERATIONS

6. APPENDIX: Front Panel Menu Tree

 

FIGURES

Figure 1-1 Pictorial of Loop-V 300 Series Products

Figure 1-2 Loop-V 300 Series Front Panel

Figure 1-3 Loop-V 300 Series Rear Panel

Figure 1-4 Application Illustrations

Figure 2-1 SNMP Ethernet Connection

Figure 3-1 Loopback Block Diagram

Figure 4-1 Loop-V 300 series Front Panel

Figure 4-2 LCD Main Menu

Figure 5-1 Terminal Main Menu

TABLES

Table 1-1 Loop-V 4300 Available Port Types

Table 3-2 E1 Line Default Setting

Table 3-3 T1 Line Default Setting

Table 3-4 Alarm Type Table

Table 3-5 Performance Parameter List

Table 3-6 Performance Report Options

Table 3-7 Front-Panel LED Table

Table 3-8 Error Message Table

2. OVERVIEW
1. Description

Loop-V 4300 is a family of E1/T1 conversion and digital signal cross-connect (DSC) products which provide 2, 3, or 4 E1 or T1 network interface ports with DS0 channel mapping. Customers can custom order Loop-V 4300 with 2, 3, or 4 ports, with or without Ethernet/SNMP, with each port equipped with the following interfaces.

Table -1 Loop-V 4300 Available Port Types

4300 Suffix	Interface Type
EL	E1 Long-Haul
ES	E1 Short-Haul
TL	T1 Long-Haul
TS	T1 Short-Haul
SNMP	Ethernet

Long-haul is for inter-office repeatered lines. Short-haul is for intra-office distances.

For example, the designation Loop-V 4300-ES-TL stands for a 2-port unit that converts 24 channels, with TSI, on one local E1 line and one network T1 line, without SNMP. The designation Loop-V 4300-TL-TL-TL-TL-SNMP stands for a 4-port unit that can perform full TSI among any T1 lines at any port, and with SNMP capability..

Loop-V 300 series can be configured via a front panel interface, local terminal (RS-232) control, or through the use of a Simplified Network Management Protocol (SNMP) management system via optional Ethernet port.

2. Physical Description

Loop-V, shown pictorially in Figure 1-1, can be used as a desk-top unit or rack-mounted. When rack mounted, two units can be mounted side-by-side on a 19-inch or 23-inch rack, occupying 1U (1.75 inches) height.



Figure -1 Pictorial of Loop-V 300 Series Products



Figure -2 Loop-V 300 Series Front Panel



Figure -3 Loop-V 300 Series Rear Panel

3. Applications

The Loop-V-300 series application example is illustrated in Figure 1-4.



Figure -4 Application Illustrations

4. Configuration Settings
1. Hardware Configuration Setting

The only user modifiable hardware configuration is the choice of balanced or unbalanced interface for E1 lines. If the factory setting, which should be specified on the order, needs to be changed, the user must slide out the printed circuit board and move some jumpers. All other configurations are software programmable. No DIP switches are available. Users should not need to remove the plug-in card for modifications other than the one mentioned above.

2. Software Configuration Setting

There are three system configurations:

Ÿ Factory default

Ÿ Current working

Ÿ User-stored

Factory default configurations are not changeable. Each Loop-V-300 series is shipped with all three configurations set to the factory default configuration.

The current working configuration can be changed at any time. The system automatically stores the current working configuration into nonvolatile memory. When the system is turned off and then turned back on again, the previous working configuration is retrieved as the current working configuration.

The current working configuration may also be saved into nonvolatile memory as a user-stored configuration. The user-stored configuration may be retrieved at any time. Retrieving the user-stored configuration overwrites the current working configuration. The factory default configuration can also be retrieved as working configuration, especially useful if the password is forgotten.

 

Table -2 Default Software Configuration

Console Port	Fixed
Baud Rate	9600
Data Bit	8
Stop Bit	1
Parity Bit	NONE
XON-XOFF	OFF
Interface	TERMINAL

T1 Line Item	Default
Frame Format Mode	D4
Line Code Mode	AMI
Line Build Out	0 dB
Yellow Alarm	ON
Inband Signaling	ON
TABS Address	CSU
Idle Code	FF

E1 Line Item	Default
Line Code Mode	HDB3
CRC	ON
RAI	ON
FDL	ON
Idle Code	D5

Active Map	Default
MAP1	all idle
MAP2	all idle
Switch MAP1: MAP2:	(00:00 - 12:00) (12:00 - 00:00)
Master Clock	Line A
2nd Clock	Line A
Password lock	Disable

Alarm Threshold	Default
Alarm Enable	Disable
Alarm Dial-out	Disable
BPV, Line	10E- 5
ES, Line	1
UAS, Line	1
CS, Line	1

Dial Out	Default
Primary Dial String	ATDT
Start Time	08:00
Stop Time	07:59
Secondary Dial String	ATDT
Start Time	08:00
Stop Time	07:59
Inactivity Time-out	0 Minutes

Miscellaneous Items	Default
External Clock	2.048 MHz
Password	LOOP
Device Name	LOOP-V-01

4. OPERATION

This chapter describes the Loop-V 300 E1/T1 Converter/TSI configuration options and operational functions.

1. System Operation
1. Date

The controller card is equipped with a RTC (Real Time Clock). User can change the current date and time as necessary.

2. Master Clock

This product has a system clock PLL (Phase Lock Loop) which may be phase locked to one of the clocks derived from a line at any port, the extenal clock, or the internal clock. The external clock can be configured for 2.048 or 1.544 MHz. The default master and 2^nd clock source are the Line-A network clock.

3. Console Port

The console port allows the user either to use a local VT-100 terminal via null-modem connection or use a remote VT-100 terminal via modem for system configuration, diagnostics, polling status reports, etc.

4. Menu Lock

The LCD front panel and terminal are used to read alarms, system configurations, and system status. The also can be used to change system configurations and clear the alarm queue, etc.. By enabling the menu-lock, only read operations are allowed, with modifications to the current status not allowed.

5. Logon, Logoff, and Password

Logoff prevents system configuration changes. The password feature is used to augment lock control against inadvertent changes or unauthorized terminal users from changing system parameters, either from the terminal or from the LCD panel. With password enabled, logon requires entering the correct password. If password is disabled, no password is required to logon.

6. Save Configuration

User can save the current configurations onto a non-volatile memory. This allows user to retrieve the last stored configuration.

2. Time Slot Interchange (Digital Signal Cross-Connect)

One primary function of the Loop-V unit is time slot interchange (TSI), also known as digital signal cross-connect (DSC), where each DSO channel of any line can be assigned to any DSO channel of any other line. The assignment table is called a map. A map contains the DSO channel assignments of all channels for all lines. An idle code is transmitted on all unused channels. The default DS0 channel assignment for all ports is idle channel.

To avoid notational confusion, the lines connected to the four ports are labled A, B, C, and D, and the time slots within each line are numbered from 1 to 24 or 31, as the case may be for T1 or E1. Thus B17 means Line B, Channel 17.

In addition to setting channel assignments, the user must also select the signaling format used for each of the lines and indicate the channel type for each channel. Signaling format can be CAS (channel associated signaling) or CCIS (common channel interoffice signaling). In the case of CAS, the E1 format uses channel 16 for that purpose, thus this channel is not available for assignment. The channel type can be data or voice. In the case of voice, the coding scheme, A-law for E1 and m -law for T1, will be converted as well. In addition, for CAS, T1 uses robbed bit signaling while E1 uses channel 16. This will also be handled according to CCITT rules.

3. DS1 Network Line Configuration

A detailed option list of E1/T1 line configuration is in Tables 2-1 and 2-2. The following paragraphs will describe each item.

1. Frame Format Mode

For the E1 line interface, the frame format is CCITT G.704. For the T1 line interface, either D4 or ESF frame format is available. In ESF frame format mode, user can choose either AT&T or ANSI facility data link protocol. ESF & T1.403 chooses ANSI ESF data link protocol and one second performance report will be sent to the network every second automatically. Also, ANSI and AT&T data link message is acceptable in ANSI ESF frame format mode. However, AT&T ESF frame format mode only accept AT&T ESF data link protocol.

2. Line Code Mode

For the T1 line interface, either AMI (Alternate Mark Inverting) or B8ZS (bipolar with 8 zero substitution) line code format can be chosen. For theE1 line interface, either AMI (Alternate Mark Inverting) or HDB3 (high density bipolar of length 3) line code format can be chosen.

3. Line Build Out

For the T1 line long haul interface, the transmit LBO can be programmed to either 0 dB, -7.5 dB, or -15 dB relative to DSX-1.

4. CRC (Cyclic Redundancy Checksum) Format

For the E1 line interface, there is a choice of two frame or multiframe mode. For two frame mode, set CRC to OFF. For multiframe mode, set CRC to ON. A proprietary facility data link is implemented in both modes to facilitate remote system control and performance and statistics monitoring.

5. Yellow Alarm/ RAI (Remote Alarm Indication)

Loop-V transmits either the RAI (Remote Alarm Indication) in the E1 case, or the yellow alarm in the T1 case, when it detects LOS (Loss of Signal), AIS (alarm Indication Signal), or OOF (Out of Frame) for 2.5 ± 0.5 seconds. User can disable this feature via the "disable RAI" or "disable yellow" alarm command.

6. Facility Data Link ¾ In-Band Signaling

In all cases, Loop-V utilizes a proprietary facility data link, FDL for E1, or in-band signaling for T1, to achieve remote system control and performance and statistics monitoring.

7. Address

In T1/ESF framing format, TABS operation requires an address of either CSU (Channel Service Unit) or TE (Terminal Equipment) identification.

8. Idle Code

Any DS0 channel, which is not assigned to another channel, is an idle channel. An idle code is transmitted on idle DS0 channels. Users may program the idle channel to any bit pattern from 0x00 to 0xFF. (The prefix 0x is to indicate hexadecimal notation.)

Table -1 E1 Line Default Setting

Item	Options	Default
Line Code Mode	HDB3, AMI	HDB3
CRC	ON, OFF	ON
RAI	ON, OFF	ON
Facility Data Link	ON, OFF	ON
Idle Code	0x00 ~ 0xFF	0xD5

Table -2 T1 Line Default Setting

Item	Options	Default
Frame Format Mode	D4, ESF , ESF&T1.403	D4
Line Code Mode	AMI, B8ZS	AMI
Line Build Out	0, -7.5, -15 dB	0 dB
Yellow Alarm	ON, OFF	ON
Inband Signaling	ON, OFF	ON
Address	CSU, TE	CSU
Idle Code	0x00 - 0xFF	FF

4. Alarm and Reports
1. Alarms

Loop-V 4300 series has many types of alarms as listed in Table 2-3. Also, Loop-V has alarm queue which record the latest 40 alarms with time stamp. Loop-V also has alarm history and alarm status registers which is used to track the alarm count. Each alarm can be individually enabled or disabled. When disabled, no action is taken. When enabled, alarm counter increments on the occurrence of the specific type of alarm. When alarm occurs or the counter threshold is exceeded, alarm is triggered.

When alarm is triggered, a dial-out is activated if it is enabled. Otherwise, no action is takes and only the specific alarm count is incremented. Dial-out is through modem to a remote terminal. When threshold level is implemented, it is based on the 15 minutes alarm count register.

All alarms are disabled by default. The dial-out is also disabled by default.

Individual fault counts are updated every second. Bipolar Violation (BPV) counts are updated every second, but the BPV alarm is based on an average Bit Error Rate (BER) that is calculated over a 15-minute interval. Therefore, BPV alarm status is updated every 15 minutes after the average BER is calculated. If the average BPV rate exceeds the preset threshold ¾ i.e., from 10-9 up to 10-5, an alarm can be declared (assuming BPV alarm is enabled). ES and UAS employ threshold-triggered alarms, but these alarms are declared as soon as the recorded account exceeds the preset threshold. The 15-minute integration interval does not apply to ES and UAS alarms. Alarm register states are reset every 15 minutes, but preserved in the Alarm History display.

Table -3 Alarm Type Table

ALARM TYPE"MAST-CLK LOSS"	Master Clock Loss			no
"RAI/YEL"	Yellow Alarm			no
"AIS"	Alarm Indication Signal			no
"LOS"	Loss of Signal			no
"LOF"	Loss of Frame			no
"BPV"	Bipolar Violation 10E- (5, 6, 7, 8, 9)			yes (default 5)
"ES"	Error Second (0 to 900)			yes (default 1)
"UAS"	Unavailable Second (0 to 900)			yes (default 1)
"CSS"	Control Slip Second (0 to 900)			yes (default 1)

2. Report

Loop-V has three sets of performance registers. These are line, user, and far-end. The line performance register tracks the line receiver performance status. The user performance register tracks the line receiver as well, but user may clear at any time. The far-end performance register tracks the far-end Loop-V receiver status. The performance parameters are listed in Table 2-4. User performance register have two additional parameters. One is BPV register to count bipolar violation in both D4 and ESF modes. The other is ESF to track framing error and CRC error in ESF frame format mode only, or CSS (controlled slip second) for E1.

Each performance parameter has ninety six sets of registers to record 24 hours history in 15 minute interval.

Table -4 Performance Parameter List

Performance Parameter	Description	Definition (T1/D4)	Definition (ESF)
ES	Error Second	BPV³ 1, OOF³ 1, or CS³ 1.	CRC6 ERROR ³ 1, OOF ³ 1, or CS ³ 1.
BES	Bursty Error Second	1 < BPV < 1544	1 < CRC6 < 320
SES	Severe Error Second	BPV ³ 1544, or OOF ³ 1	CRC6 ³ 320, or OOF ³ 1
CSS	Controlled Slip Second	frame slip ³ 1	frame slip ³ 1
OOF	Out of Frame	2 frame bit error in 6 consecutive frame bits	2 frame bit error in 6 consecutive frame bits
LOFC	Loss Of Frame Count	OOF for 2.5 ± 0.5 sec	OOF for 2.5 ± 0.5 sec
UAS	Unavailable Second	³ 10 consecutive SES	³ 10 consecutive SES
BPV	Bipolar Violation	Bipolar Error Count	Bipolar Error Count
ESF	CRC6 Error, or Out Of Frame	(not used, always 0)	CRC6 error or OOF

 

Table 2-5 lists the types of reports available, performance parameters provided by each report, and the reset commands for each report.

Table -5 Performance Report Options

Report Type	Category	Report
[Menu Command]		ES	UAS	BES	SES	CSS	LOFC	BPV	ESF
Front Panel Reports	USER [Network]	Y	Y	Y	Y	Y	Y	Y	¾
1-Hour Terminal	USER [Network]	Y	Y	Y	Y	Y	Y	¾	¾
Reports	LINE [Network]	N/C	N/C	N/C	N/C	N/C	N/C	¾	¾
Menu Option [1]	FAR-END	N/C	N/C	N/C	N/C	N/C	N/C	¾	¾
24-Hour Terminal	USER [Network]	Y	Y	Y	Y	Y	Y	Y	Y
Reports	LINE [Network]	N/C	N/C	N/C	N/C	N/C	N/C	N/C	N/C
Menu Option [2]	FAR-END	N/C	N/C	N/C	N/C	N/C	N/C	¾	¾
CRC Error Count	USER [Network]	¾	¾	¾	¾	¾	¾	¾	Y X
Terminal Reports	LINE [Network]	¾	¾	¾	¾	¾	¾	¾	N/C
Menu Option [E]	FAR-END	¾	¾	¾	¾	¾	¾	¾	N/C

Y = Report available and can be cleared by front panel “ RESET” or admin terminal command “ Y” .

X = Report available and can be cleared by front panel “ RESET” or admin terminal command “ X” .

N/C = No clear. Report available, but counts cannot be cleared by the user.

Ä = Report not available.

 

3. Requesting Report

The performance report can be accessed from local terminal directly or from remote terminal via modem. Also, with FDL set to ON, performance report, as well as setting configuration, of the remote E1 terminal can be accessed via data link. In both T1/D4 and ESF frame format mode, the performance report can be accessed from local terminal directly or from remote terminal via modem.

Also, in ESF mode, performance report can be accessed via data link. User will choose either AT&T or ANSI T1.403 data link operation in DS1 network line interface configuration. AT&T TR 54016 should be referred to as how the performance report request message and response message are structured. ANSI T1.403 should be referred to how the one second performance report message structured.

Loop-V supports both AT&T TR 54016 and ANSI T1.403 performance report message.

5. LED Operation

The front panel has 4 LEDs, one for power and one each for each line. Table 2-6 lists each LED and its color and indications.

Table -6 Front-Panel LED Table

LED	Color	Indication
POWER	Green Flashing Green Off	Powered on and operational During initialization Power off, or self-test failure
LINE-A	Off Green Flashing Green Red Flashing Red Amber Flashing Amber	Line frame not in sync Line frame in sync A line-side test is in progress Loss of Frame Sync (LOFS) or Loss of Signal ( LOS) Line has bipolar violation Receive yellow alarm from line Receive AIS from line
LINE-B	As above	As above
LINE-C	As above	As above
LINE-D	As above	As above

 

6. Error Message

Loop-V provides various error messages on LCD display to indicate abnormal condition as listed in Table 2-7.

Table -7 Error Message Table

ERROR CODE	ERROR DESCRIPTION
ERROR01	A loopback is in effect
ERROR02	FDL ESF or ESF&T1.403 mode is required
ERROR03	LCD operation is locked
ERROR04	Channel is already in use
ERROR05	Cannot confirm due to alarms
ERROR06	Can’t change active map of SWITCH
ERROR07	No DS0 channel is assigned
ERROR08	Modem error
ERROR09	A diagnostic test is in progress
ERROR11	SNMP_SLIP mode is in progress
ERROR12	Illegal Date/Time format
ERROR17	Remote does not have this function
ERROR18	Remote unit rejected this request
ERROR19	Remote unit did not respond
ERROR23	Undefined response
ERROR24	The port did not respond
ERROR26	Port not installed

7. Embedded SNMP Agent (When Equipped)

The optional embedded SNMP agent for Loop-V offers standard RFC 1213 MIB II and RFC 1406 DS1 MIB as well as Loop Telecom’s enterprise MIB. Network manager can use any SNMP compatible network management system such as Sun Connect’s Sun Net Manager and Hewlett-Packard’s HP Open View to monitor and control Loop-V-300 series. This enables user to integrate WAN equipment management with LAN SNMP network management systems. The embedded SNMP agent also includes Telnet implementation to allow user to access Loop-V terminal interface from any workstation in the network.



Figure -1 SNMP Ethernet Connection

The Loop-V uses the console port to provide the embedded SNMP agent functionality. Typically, a workstation can be configured to run SLIP protocol on its async ports. If there is only few Loop-V that needs SLIP interface, no dedicated terminal server is needed.

Telnet capability comes with embedded SNMP agent. Once SNMP agent is running, user can use telnet program that simulats a VT100 to access Loop-V command screen.

5. MAINTENANCE
1. 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, "SELF TEST" message is shown on the upper line of the LCD display. The software release version and date code is shown on the lower line of the LCD display. If an error is found, FAIL is shown in the upper right corner of the LCD display and a dedicated error message is shown on the lower line. Users may press ESC, left arrow ( < ), right arrow ( > ), and ” ENTER” key in this order to read a specific error code. If no error is found, the LCD display will show "PASS" in the upper right corner of the LCD display followed by a Main Menu as in Figure 4.2. Various system diagnostic methodology can be found in the following paragraphs.

2. Diagnostics

Pseudo-random patterns are commonly used for diagnostic tests of digital systems. For E1, a 15-bit register PRBS (pseudo-random binary sequence) pattern is standard practice. For T1, a 20-bit register QRSS (Quasi-Random Signal Sequence) patterns is used. Both patterns are available for testing local Loop-V system integrity by local loopback test, and for measuring the line quality.

3. Near End Loopback

The near end loopbacks such as local loopback, line loopback, and payload loopback, are activated by the local Loop-V. The loopbacks are at the near end facility. The following paragraph describes each loopback in detail.

1. Local Loopback

Local loopback is illustrated in Figure 3-1. The outgoing signal is looped back through the T1 PCM transceiver. All DS0 channels are looped back to the receiver path. This loopback test is activated by the Test command. This loopback test can be used with the PRBS/QRSS diagnostic test pattern to validate the framer and the line interface circuits of any one port. When used with a test set connected to another port, this loopback validates the TSI function. An AIS (Alarm Indication Signal) is sent to the network during the local loopback test. The local loopback test can be activated from the front panel and terminal.



Figure -1 Loopback Block Diagram

2. Line Loopback

Line loopback is illustrated in Figure 3-1. The incoming line signal is loopback to the outgoing signal before the transceiver framer. This loopback is used to isolate the local equipment from a troubled transmission line. Line loopback test can be activated from the front panel and terminal.

3. Payload Loopback

Payload loopback is illustrated in Figure 3-1. The incoming signal is loopback to the outgoing line signal after the transceiver framer. This loopback is used to isolate the TSI from the troubled transmission line. Payload loopback test can be activated from the front panel and terminal.

4. Far End Loopback

Far-end loopbacks (remote line loopback, remote payload loopback) can be activated by the local Loop-V to cause a remote facility to perform the loopbacks. Inband codes, AT&T and ANSI FDL protocols, and proprietary codes are utilized to send remoter loopback commands to the far-end facility. For E1, inband codewords are supported by FDL (facility data link) to initiate the loopbacks. When using FDL messages, FDL must be turned ON. For T1, inband codewords are supported by D4, ESF, or ESF&T1.403 framing format. When using AT&T FDL messages, the Line port must be set for ESF or ESF&T1.403 framing format. When using ANSI FDL messages, the Line port must be in ESF&T1.403 framing format. All remote loopback can be activated from the front panel or the terminal.

If the remote facility responds to a remote loopback activate command, a LOOPED message appears in the lower left corner of the display. If the remote facility responds to a remote loopback deactivate command, a NOLOOP message appears. If the remote activation/deactivation fails, an error message appears.

1. Remote Line Loopback

Remote line loopback is illustrated in Figure 3-1. The remote line loopback is initiated by the remote equipment through FDL inband signal or ESF data link message with AT&T or ANSI protocol. Remote line loopback test can be activated from the front panel and terminal .

2. Remote Payload Loopback

Remote payload loopback is illustrated in Figure 3-1. The remote payload loopback is initiated by the remote equipment through FDL or ESF data link message with AT&T or ANSI protocol. Remote payload loopback test can be activated from the front panel and terminal .

5. Test Patterns

Four test patterns are available to determine faults such as deficient clock recovery, fault ALBO level recovery, inadequate jitter margin, presence of bridge taps, and mis-optioned network interface. These four patterns are framed pattern with proper E1 or T1 (D4 or ESF) frame pattern as described in the following paragraphs.

1. 3-in-24 Pattern

This framed 3-in-24 pattern is aligned with the frame bit so as not to transmit a false yellow alarm. It tests the consecutive zeros requirement and useful to test AMI circuits.

Framed 3-in-24 pattern sequence is as follows,

1. F 01000100 00000000 00000100 01000 . . . . . (Left to Right)

F indicates frame alignment bits.

2. 1-in-8 Pattern

This framed 1-in-8 pattern tests the ability of a circuit to support a pattern having the minimum ones density. It is useful to reveal a timing recovery problem. The bit set to one must be set to bit 2 to avoid false yellow alarm.

Framed 1-in-8 pattern sequence is as follows,

1. F 01000000 01000000 0100 . . . . . (Left to Right)

F indicates frame alignment bits.

3. 2-in-8 Pattern

This framed 2-in-8 pattern, in conjunction with the 1-in-8 Pattern, is useful when performing tests to reveal the presence of equivalent mis-optioned for B8ZS. Use of 2-in-8 pattern will confirm the circuit’s ability to support error free transmission when B8ZS substitution do not occur. A framed 1-in-8 will contain 8 consecutive zeros around a zero frame bit causing a B8ZS substitution.

Framed 2-in-8 pattern sequence is as follows,

1. F 01000010 01000010 01 . . . . (Left to Right)

F indicates frame alignment bits.

4. 1:1 Pattern

This framed 1:1 pattern tests AMI circuits. It will cause false yellow alarm in D4 frame format mode.

Framed 1:1 pattern sequence is as follows,

1. F 10101010 10101010 10 . . . . . (Left to Right)

F indicates frame alignment bits.

6. FRONT PANEL OPERATION

The front panel operation utilizes a two by sixteen (2 x 16) characters LCD display window and four keypads each labeled with ESC, ENTER, left arrow ‘<’, and right arrow ‘>’, as shown in Figure 4-1.

ENTER key is used to move down the menu tree or to enable a selection.

LEFT and RIGHT arrow keys show other menu item in the same level.

ESC key returns the operation to an upper layer menu up to the main menu.



Figure -1 Loop-V 300 series Front Panel

Each display only shows one menu item. The main menu is shown in Figure 4-2 below. It is the first menu displayed after power up.



Figure -2 LCD Main Menu

The first tier menu includes Configuration, Diagnostics, Alarm, Performances, and Miscellaneous. Each sub-menu is further broken down into sub-level menus. Subsequent chapters give detailed information regarding these menus. See Appendix for an overview of the menu tree.

A typical LCD display is shown below. In this illustration, a particular TSI connection is shown.



The display indicates that a connection is made from Line-A Channel 5 to Line-B Channel 7. Furthermore, Line A is equipped with an E1 line, Line B is equipped with a T1 line, and the signal within the Channels being connected is data, indicated by "D".

8. TERMINAL OPERATION

Loop-V 4300 series provide comprehensive report and enhanced configuration capability through the console port. A VT100 type terminal or a modem can be connected to the console port in the front of Loop-V. Using single-character commands and arrow keys, Loop-V can be configured and monitored. The single-character command is not case sensitive. On each screen, the available commands and the configurable fields are highlighted. Alarm messages are also sent to the console port and are shown on the top of the screen in blinking mode. Upon Loop-V power up, a main menu is shown.

The main menu consists of four groups of commands, Display, Access, Setup and Clear & Reset. Initially, only Display and Access commands are available. To enable Setup and Clear commands, user has to log on using "O" command.

Loop-V 4300 series V1.14 === Main Menu === 10:51:45 02/15/97 [DISPLAY] [SETUP] 1 -> 1-Hour Perf. Report L -> Loopback Test 2 -> 24-Hour Perf. Report M -> Alarm Setup A -> Line Availability P -> Password Setup C -> Loop-V System Setup R -> Retrieve Last Stored Configuration D -> Loop-V Description S -> System Setup E -> ESF Error Count T -> TSI Map Setup H -> Alarm History K -> Change Date and Time I -> Loop-V Status V -> Store Current Configuration Q -> Alarm Queue [ACCESS] [CLEAR & RESET] F -> Log Off [SETUP] and U -> Clear Alarms [CLEAR & RESET] menu X -> Clear ESF Error Count O -> Log On [SETUP] and Y -> Clear Performance Data [CLEAR & RESET] menu Z -> System Reset         >>Enter Command ?

Figure -1 Terminal Main Menu

A typical setup screen is shown below, for viewing and entering time slot interchange configuration.

=== TSI MAP Setup === 15:36:27 02/13/97 ARROW KEYS : CURSOR MOVE , TAB : ROLL UP Line-A E1 CAS=ON [iiiiB iiiii iiiii Siiii iiiii iiiii i] 0 5 V Line-B T1 CAS=ON [iiiiA iiiii iiiii iiiii iiii] 0 5 V Line-C Line-D << Press ESC Key to Return to Main Menu >>

 

The display indicates that a connection is made from Line-A Channel 5 to Line-B Channel 5. Furthermore, Line A is equipped with an E1 line, Line B is equipped with a T1 line, and the signal within the Channels being connected is voice, indicated by "V". For both lines, CAS (channel associated signaling) is used.

9. APPENDIX: Front Panel Menu Tree