ADC DLCSMR3D User Manual

ADCP-75-179 • Preliminary Issue A • September 2004 • Section 3: Operation

2. Click on the HOST Site Name Edit button (see Figure 3-6). The Site Name pop-up

screen will open as shown in Figure 3-7. Enter a unique name for the HOST. The name may be up to 32 characters long and must not contain any spaces. The name may include numbers, punctuation, and upper or lower case letters and must always begin with a letter. Click on OK to close the screen and make the changes take effect.

Figure 3-7. HOST Site Name Pop-Up Screen

3. Click on the HOST Site Number Edit button (see Figure 3-6). The Site Num ber pop-up

screen will open. Enter any number (must be unique) between 1 and 24 and then click on OK to close the screen and make the changes take effect.

4. Check the REMOTE Site Number field (see Figure 3-6). The REMOTE Site Number

does not have to be entered. When the HOST Site Number is entered, the system will automatically enter the same number for the REMOTE Site Number.

5. Click on the REMOTE Site Name Edit button (see Figure 3-6). The Site Name pop-up

screen will open. Enter a unique name for the REMOTE. The name may be up to 32 characters long and must not contain any spaces. The name may include numbers, punctuation, and upper or lower case letters and must always begin with a letter. Click on OK to close the screen and make the changes take effect.

6. Open the Tools menu at the top of the main window and then select Refresh Catalog to make the new Host and Remote sit e names appear in the View menu.

2.5 Enter Host Forward Attenuation

The HU internal forward path attenuator setting determines the maximum composite output signal level at the STM antenna port. The appropriate attenuation value for any particular system is based on the number of channels the system is transporting and the signal level of the composite forward path signals input at the host units RF IN ports. By default, the forward path attenuator is set to 31 dB.

The maximum output power that can be provided by the system is 43.4 dBm (22 Watts). The total forward pa th gain that is pro vided by the system (with host and remote forw ard attenuators set to 0 dB) is 85 dBm. Use the following procedure to set the forward path attenuation to provide the maximum composite output signal level:

1. Click on the HOST RF tab. The HOST RF display will open within the EMS main window as shown in Figure 3-8.

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ADCP-75-179 • Preliminary Issue A • September 2004 • Section 3: Operation

Click on Edit button to open Host Fwd Att pop-up screen

Figure 3-8. HOST RF Display

2. Click on the Host Fwd Att Edit button (see Figure 3-8). The Hos t Fw d At t pop-up screen

will open as shown in Figure 3-9.

Figure 3-9. Host Fwd Att Pop-Up Screen

3. Obtain the value of the total composite input signal level as determined in step 11 of

Section 2.3.

4. Determine the appropriate value to enter for the Host forward path attenuator by subtracting the required system output level (per system design plan) from the system ga in (85 dB) and then adding the composite input signal level. The result (see sample calculation) is the amount of atte nuation required.

Atten = (System Gain) – (Required System Output Power) + (Composite Input Power)

5. Enter the attenuation value and click OK to close the pop-up screen and to make the changes take effect.

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ADCP-75-179 • Preliminary Issue A • September 2004 • Section 3: Operation

2.6 Determine Output Signal Level at STM Antenna Port

The RF output signal level should be measured at the STM ANTENNA port to verify that maximum composite signal level is at the required level. Use the following procedure to determine the po wer level:

1. Verify that RF ON/OFF swi t c h on the LPA is in th e OFF position.

2. Disconnect the antenna cable from the STM ANTENNA port.

3. Connect a spectrum analyzer or RF power meter to the STM ANTENNA port. (Check the input rating of the test equi pment. Insert a 30 dB 100 W attenuator if necessary.)

4. Place the RF switch on the LP A in the ON position.

5. If using a spectrum analyzer, proceed to step 6. If using a power meter, measure the composite signal po wer from the STM and then proceed to step 8.

6. Measu re the RF level of a single ca rrier, such as the con trol channe l, in dBm. Mak e sure the resolution bandwi dth of the spectrum analyzer is 30 kHz.

7. Calculate the total composite signal power using the fol lowing formula:

= Pc + 10Log N

tot

Where,

is the total composite powe r in dBm

tot

is the power per carrier i n dBm as meas u red in s tep 6, and

N is the total number of channels.

8. Record the result measured in step 5 or calculated in step 7.

9. Place the RF switch on the LP A in the OFF position.

10. Disconnect the spectrum analyzer or RF power meter from the STM ANTENNA port.

11. Re-connect the antenna cable to the STM ANTENNA port.

Note: To comply with Maximum Permissible Exposure (MPE) requirements, the maximum composite output from the antenna cannot exceed 1000 Watts EIRP and the antenna must be permanently installed in a fixed location that provides at least 6 meters (20 feet) of separation from all persons.

2.7 Enter Remote Forward Attenuation

The STM internal forward path attenuator setting is used to reduce the power level of the composite output signals at the STM antenna port. The maximum composite output signal level at the STM antenna port is set using the Host internal forward attenuator (see Section 2.5). However, component variations may result in the output power at the STM antenna port being slightly above or below the required power per channel. If this is the case, the STM forward attenuator may be used in conjunction with the Host forward attenuator to add or remove attenuation to produce the required output signal level. If less power is required, the STM forward attenuator may be used to reduce the power level. The default setting is 31 dB. Use the following procedure to change the STM forward attenuation:

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ADCP-75-179 • Preliminary Issue A • September 2004 • Section 3: Operation

1. Click on the REMOTE RF tab. The REMOTE RF display will open within the EMS main

window as shown in Figure 3-10.

Click Edit button to

open the Remote Fwd

Att pop-up screen

RF output signal

level (± 3 dB)

Figure 3-10. REMOTE LPA Display

2. Check the level of the RF output signal (as determined in Sectio n 2.6) ag ains t the sys tem design plan specifications. Table 3-2 shows the output signal level required to provide 5 watts per channel for systems with 1 to 4 channels. The maximum output signal level permitted for the system is 43.4 dBm (22 Watts).

Table 3-2. Composite Output Signal Levels

OUTPUT SIGNAL LEVEL

NUMBER OF

CHANNELS

REQUIRED TO PROVIDE 5

WATTS PER CHANNEL

137 dBm 240 dBm 342 dBm 443 dBm

3. Dete rmine i f mor e or l e ss a t tenu ati on is r equ ire d to pr o duce the r equi re d out put s ig nal le v el .

4. Click on the Remote Fwd Att field Edit bu t to n (s ee Figure 3-10). The Remote Fwd Att pop-up screen will open as shown in Figure 3-11.

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ADCP-75-179 • Preliminary Issue A • September 2004 • Section 3: Operation

Figure 3-11. Remote Fwd Att Pop-Up Screen

5. Enter the required attenuation value and click OK to close the pop-up screen and to make the changes take effect.

6. Verify that the appropriate RF output signal level appears in the RF Output Power field (see Figure 3-10). This is primarily a reference value and should not take the place of external test equipment when determining the power level of the composite RF output signal. Depending on the modulation type and number of channels, the EMS softwar e may report a power level that is higher or lower (± 3 dB) than the actual RF output signal.

2.8 Enter Host Reverse Attenuation

The level of the RF signal that should be input to the EBTS will vary depending on the type of EBTS, the receive distributi on, and the number of channels pre sent. To interf ace with the EBTS, the reverse path signal level must be adjusted to provide the signal level required by the EBTS. The HU provides from –1 to +30 dB of gain in the reverse path. By default, the host reverse attenuator is set to –31 dB of attenuation which provides –1 dB of gain. Use the following procedure to set the reverse path gain:

1. Check the EBTS manufacturer’s specifications to determine the composite signal level required at the 806–824 MHz and 896–901 MHz reverse path input ports.

2. Determine the overall gain and loss imposed on the signal by the antenna, antenna cable, and by the cables that connect the HU to the EBTS.

3. Determine the amount of gain required to raise the revers e path signal to the le vel required at the EBTS.

4. Click on the HOST RF tab. The HOST RF display will open within the EMS main window as shown in Figure 3-12.

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ADCP-75-179 • Preliminary Issue A • September 2004 • Section 3: Operation

Click Edit button to

open the Host Rev Att

pop-up screen

Figure 3-12. HOST RF Display

5. Click on the Host Rev Att field Edit button (see Figure 3-12). The Host Rev Att pop-up

screen will open as shown in Figure 3-13.

Figure 3-13. Host Rev Att Pop-Up Screen

6. Enter the attenuation value that will provide the required gain. Refer to Table 3-3 for the attenuation values and the corresponding gain (nominal) values.

7. Click OK to close the pop-up screen and to make the changes take effect.

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ADCP-75-179 • Preliminary Issue A • September 2004 • Section 3: Operation

Table 3-3. Reverse Path Attenuation Setting and Nominal Gain Provided

ATTENUATION

SETTING

0 dB → 30 dB 11 dB → 19 dB 22 dB → 8 dB

1 dB 29 dB 12 dB 18 dB 23 dB 7 dB 2 dB 28 dB 13 dB 17 dB 24 dB 6 dB 3 dB 27 dB 14 dB 16 dB 25 dB 5 dB 4 dB 26 dB 15 dB 15 dB 26 dB 4 dB 5 dB 25 dB 16 dB 14 dB 27 dB 3 dB 6 dB 24 dB 17 dB 13 dB 28 dB 2 dB 7 dB 23 dB 18 dB 12 dB 29 dB 1 dB 8 dB 22 dB 19 dB 11 dB 30 dB 0 dB 9 dB 21 dB 20 dB 10 dB 31 dB –1 dB

10 dB 20 dB 21 9 dB

GAIN

PROVIDED

2.9 Enter Host Forward and Reverse Delay

The forward and reverse delay function allows entry of from 0 to 63 µsec of delay in the forward and reverse path s. This featu re is used when mu ltiple sys tems are used to tran sport th e same channel and the re is a significant differenc e in the path delay betwe en s ystems. Additional delay may be e ntered to balance the overall system delay. The amount of delay requir ed must be calculated by the RF engineer and should be included in the system design plan. The default setting is 0 µsec. Use the following procedure to change the forward and reverse path delay:

ATTENUATION

SETTING

GAIN

PROVIDED

ATTENUATION

SETTING

GAIN

PROVIDED

1. Click on the HOST RF tab. The HOST RF display will open within the EMS main

window as shown in Figure 3-14.

2. Click on the Host Fwd D elay field Edit button (see Figure 3-14). T he Host Fwd Delay

pop-up screen will open as shown in Figure 3-15.

3. Obtain the value of the forward delay as specified in the system design plan. The delay is adjustable in 0.1 µsec steps.

4. Enter the forward path delay value and click OK to close the pop-up screen and to make the changes take effect.

5. Repeat the pr ocess for reverse delay by right-clicking on the appropriate delay section (see

Figure 3-14) and then entering the required delay value in the pop- up screen.

6. Click OK to close each pop-up screen and to make the changes take effect.

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ADCP-75-179 • Preliminary Issue A • September 2004 • Section 3: Operation

Click Edit button to

open the Host Fwd

Delay pop-up screen

Click Edit button to

open the Host Rev

Delay pop-up screen

Figure 3-14. HOST RF Display

Figure 3-15. Host Fwd Delay Pop-Up Screen

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SECTION 4: MAINTENANCE

1 SYSTEM MAINTENANCE OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

1.1 Tools and Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1

2 FAULT DETECTION AND ALARM REPORTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

3 FAULT ISOLATION AND TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-6

3.1 Host Unit Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-7

3.2 STM Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9

3.3 LPA Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13

4 TEST PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15

4.1 Optical Power Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15

4.2 Optical Loopback Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17

5 SCHEDULED MAINTENANCE REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19

_________________________________________________________________________________________________________

1 SYSTEM MAINTENANCE OVERVIEW

ADCP-75-179 • Preliminary Issue A • September 2004 • Section 4: maintenance

This section explains the Digivance system f ault detection and alarm reporting system, provides a method for isolating and troubleshooting faults, and provides test procedures. The Digivance system requires minimal regular maintenance to insure continuous and satisfactory operation. Components that require regular replacement, cleaning, or testing include the HU fans, STM fan, LPA fa ns, RU cabinet air-filter, and RU back- up battery.

Maintenance also includes diagnosing and correcting service problems as they occur. When an alarm is repo rted, it will be necessary to follow a systemat ic troubleshooting procedure to locate the problem. Once the source of the problem is isolated, the appropriate correctiv e action can be taken to restore service. The only internal components that can be replaced are the cooling fans which mount in the HU, RU, and LPA. The failure of any other internal component will require replacem ent of the en ti re uni t.

1.1 Tools and Materials

The followi ng tools and materials are required in order to complete the maintenanc e proc edures specified in this section:

•ESD wrist strap

• IR filtering saf ety glasses

• Patch cords with SC connectors

• 15 dB in-line SC optical attenuator s

• Optical power meter (15 50 and 1310 nm)

• TORX screwd river (with T10 b it)

• Battery maintenance tools (see PRC-SERIES OPERATING AND FIELD SERVICE MANUAL for tool recommenda tions)

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ADCP-75-179 • Preliminary Issue A • September 2004 • Section 4: maintenance

2 FAULT DETECTION AND ALARM REPORTING

The Digivance LRCS on-board embedded software de tects various unit and system faults which generate et her a Maj or or M inor a larm. A Major alarm indicates that the syst em has failed in a way that directly affects RF transport performance. When a major alarm occurs, all RF functions are disabled and the system is out of service. A Minor alarm means that system performance is not affected or in some cases, that the performance may no longer be optimal. When a minor alarm occurs, RF functions continue and the system remains in service.

The following means are used to report Major and Minor alarms:

• HU alarm cont acts

• HU, STM, and LP A front panel LED’ s

• EMS soft ware G ra phi ca l Us er Int erfac e (G U I)

• Network Operations Center - Network Element Manager (NOC/NEM) interface

• SNMP interface

The HU is equipped with a set of both normally open (NO) and normally closed (NC) alarm contacts which may be used to report both Major and Minor al arms to an exter nal alarm system. The alarm cont acts summarize the i nputs so that any Major or Minor ala rm will trigger an a larm repo r t to the external a larm system .

The HU, STM, and LPA front panel LED indicators show status and alarm information by displaying various colors: Green, Red, Yellow, and Off. In addition to LED indicators, the 35 Watt LPA is also equipped with a Digital Display that provides text messages. A description of the Host Unit, Spectrum Transport Module, and 35 Watt LPA LED indicators is provided resp e ctively in Table 4-1, Table 4-2, and Table 4-3.

The EMS software GUI provides both a summary and a detailed list of alarm information that includes unit and module level faults, circuit faults, and measured value faults such as voltages, RF power, and temp erature. A s ummary showin g a list of all systems a nd their curre nt alarm status is presented through the Alarm OverView display. A more detailed list of alarm information is presente d through the HOST alarm display and the REMOTE alar m display. The various fault conditions that trigger a major or minor alarm report are shown in the HOST and REMOTE alarm dis pla y s.

The NOC/NEM interface provides the same summary and detailed listing of alarm information as the EMS software GUI but in an ASCII text string format. Sending the command GET ALARMSUMMARY produces a list of all systems and their current alarm status. Sending the command GET ALARM ALL for a specific system will produce a detailed list of alarm information for the specified system.

The SNMP interface provides alarm information to up to ten SNMP managers which must be register ed with the SNMP agent. The SNMP interfac e allo ws the SNMP managers to rece iv e the alarm and status information generated by the host and remote units. The presentation of the alarm information is depe ndent on the features of the SNMP manager.

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ADCP-75-179 • Preliminary Issue A • September 2004 • Section 4: maintenance

Table 4-1. Host Unit LED Indicators

INDICATOR COLOR DESCRIPTION

POWER

Green Off

Indica tes if the HU is p owered or un- pow e red .

The DC power source is on. The DC power source is off.

STANDBY

Indicates if the system is in the standby, normal, test, or program load mode.

Green (blinking) Yellow (blinking) Red (blinking) Off

HOST UNIT

The HU is in the standby m ode. The HU is in the program loa d mode. The HU is in the test mode . The HU is in the normal mode.

Indicates if the HU is normal, over temperature, if an internal fault is detected, or if there is an equipment mismatch.

Green Yellow Red

REMOTE UNIT

Green Yellow Red

DRIVE 851–869 and DRIVE 935–940

Green Yellow Red

FWD/REV (PORT 1/P ORT 2)

The HU is normal. The HU is over temperature or d etects an internal fault. The HU detects an internal fault or HU/RU band mismatch.

Indicates if an alarm is detected at the RU.

No alarms detected at the RU. A minor alarm is detected at the RU. A major alarm is detected at the RU.

Indicates if the specified forward path RF si gnal level is norma l, abov e overdrive thresh o l d , or bel ow un derdrive threshold.

The RF signal level is normal The RF signal level is belo w the underdrive threshold. The RF si g nal level is above the overdrive th r esho ld .

Indicates if the reverse path optical signals fr om the STM are normal, if errors are detected, or if the optical signal is not detected.

Green Red

The reverse path optical signals are normal. Excessive errors (see Note) are detected in the reverse path optical s ignals or t he HU is not rece ivi ng a rev er se pa th optic al

signal.

Note: Excessive erro rs means the Bit Error Rate (BER) has exceeded 10

–6

(1 bit error per million bits) .

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ADC DLCSMR3D User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual