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ADCP-61-471 • Issue 4 • June 2000 • Section 2: Operation and Maintenance
2-135
© 2000, ADC Telecommunications, Inc.
DLP-541
Page 6 of 16
Table 541-1. Loopback Selection Field Options
FIELD UNIT TYPE LOOPBACK TYPE OPTION SHOWN IN…
DS3 MUX (HIGH SPEED)
Local DS3 MUX Network Loopback at the DS3 MUX ACT NET Figure 541-5
HDSL SYSTEMS (LOW SPEED)
Local HLXC Customer Loopback at the HLXC ACT CUST Figure 541-6a
Network Loopback at the HLXC ACT NET Figure 541-6b
Local HLXC Send Loopback at the HLXC Module SEND LPBK* Figure 541-6c
Remote HLXR Customer Loopback at the HLXR ACT CUST Figure 541-7a
Network Loopback at the HLXR ACT NET Figure 541-7b
HDSL SYSTEM WITH ONE HRX (LOW SPEED)
Repeater HRX1 Customer Loopback at the HRX ACT CUST Figure 541-8a
Network Loopback at the HRX ACT NET Figure 541-8b
HDSL SYSTEM WITH TWO HRXS (LOW SPEED)
Repeater 1 HRX1 Customer Loopback at the HRX1 ACT CUST Figure 541-9a
Network Loopback at the HRX1 ACT NET Figure 541-9b
Repeater 2 HRX2 Customer Loopback at the HRX2 ACT CUST not shown
Network Loopback at the HRX2 ACT NET not shown
FIBER OPTIC SYSTEM WITH ODS2 AND QLX MODULES (LOW SPEED)
Local ODS2 Customer Loopback at the ODS2 Module ACT CUST Figure 541-10a
Remote QLX Network Loopback at the Remote QLX ACT NET Figure 541-10b
Local ODS2 Send Loopback at the ODS2 Module SEND LPBK* Figure 541-10c
T1 SYSTEM WITH DLX MODULE (LOW SPEED)
Local DLX Customer Loopback at the DLX ACT CUST Figure 541-11a
Network Loopback at the DLX ACT NET Figure 541-11b
Local DLX Send Loopback at the DLX Module SEND LPBK* Figure 541-11c
T1 SYSTEM WITH RLX MODULE (LOW SPEED)
Local RLX Customer Loopback at the RLX ACT CUST Figure 541-12a
Network Loopback at the RLX ACT NET Figure 541-12b
Local RLX Send Loopback at the RLX Module SEND LPBK* Figure 541-12c
* The SEND LPBK option is only available in the Soneplex Broadband System at the Local command toggle
field on the Loopback Status/Commands screen when the DS1 Loopback Mode field on the DS3 MUX
Configuration screen is configured as C-Bit parity.
Note:
When a customer (CPE) loopback is in progress, the network output signal is returned to the network as a
keep-alive for network equipment. However, when a network loopback is in progress, an unframed all 1s signal
(AIS) is transmitted to the customer interface.