Specifications

Section 520-10S-WI3-203
030-101591 Rev. B
R
18
0806I3RB
ered from an external power supply, it operates from a voltage
source of ±48Vdc, ±24Vdc or 24 Vac.
The unit’s external power lead is fused and provides an alarm
output (pin 25) for external reporting of a local power alarm.
The front-panel ALM (Alarm) LED illuminates if the power
fuse opens.
7.2.2 Span Current Pin Jacks
The unit is equipped with two sets of span current pin jacks,
designated LINE −I and +I and DROP −I and +I, on the
front panel and provide easy access for the installer.
8. TESTING & TROUBLESHOOTING
8.1 Testing
Testing consists of performing the steps outlined in Table 8.
These procedures are intended only to ascertain proper opera-
tion of the unit. Tests beyond those outlined, or repairs made
beyond replacing a faulty unit, are not recommended and may
void the warranty.
8.2 Troubleshooting
If trouble is encountered, verify all installer connections to the
assembly and check that the CO power fuse is not blown. Also
verify all module connections and option switch settings, and
verify the modules are making a positive connection with the
shelf connector. If trouble persists, replace the suspect unit and
repeat procedures outlined. These procedures are not de-
signed to effect repairs or modifications. Any tests beyond
those outlined herein, or repairs made beyond replacing a
faulty unit, are not recommended and may void the warranty.
9. CUSTOMER & TECHNICAL SERVICES
If technical or customer assistance is required, contact Westell
by calling or using one of the following options:
Voice: [phone]
email: [e-mail]
For additional information about Westell, visit the Westell
World Wide Web site at http://www.Westell.com .
Step Action Results
1.
Option and install unit
2.
Apply Power
If unit is Span Powered, verify the current at the Span Cur-
rent Test DROP" Points (front panel)
PWR LED is ON
Voltage should be equal to 0.6 Volts (±0.03V) for 60mA
operation
3.
Press front-panel MLB button (>3 but <5 sec.) LPBK LED illuminates; Unit enters Network Loopback
4.
Send Quasi-Random signal to unit Verify QRSS Test code on RCV pair from unit
5.
Press front-panel MLB button again LPBK LED extinguishes; Unit returns to normal
6.
Press front-panel MLB button (>5 but <7 sec.) LPBK LED illuminates; Unit enters Dual Loopback
7.
Send Quasi-Random signal to unit Verify QRSS Test code on RCV pair from unit
8.
Press front-panel MLB button again LPBK LED extinguishes; Unit returns to normal
9.
Press front-panel MLB button (>7 sec.) Provisioning LEDs flash once, followed by flashing PWR/
RPTR LED
10.
Press front-panel MLB button again (<3 sec.) Flashing PWR/RPTR LED extinguishes; Unit returns to
normal
11.
Depending on Mode of Operation:
If set for Office Repeater or Line Repeater Mode
Send loop-up code to unit
Inband − 11000 (>5 sec.)
ESF − 0001 0010 1111 1111 (>16ms)
Send loop-up code to unit a second time
Inband − 11000 (>5 sec.)
ESF − 0001 0010 1111 1111 (>16ms)
If set for Network Interface Unit (NIU) Mode
Send loop-up code to unit
Inband − 11000 (>5 sec.)
ESF − 0001 0010 1111 1111 (>16ms)
LPBK LED flashes; Unit is armed
LPBK LED illuminates; Unit is in Loopback
LPBK LED illuminates; Unit is in Loopback
12.
Perform Bit Error Rate (BER) test BER must be within acceptable limits
13.
Send loop-down code to unit
Inband − 11100 (>5 sec.)
ESF − 0010 0100 1111 1111 (>16ms)
LPBK LED extinguishes; Unit returns to normal
Table 8. 520-10SWI3 Test Procedures