Testing152-388-100-02, Issue 2

Table 15. Summary of HiGain Loopback Codes and Activation Methods

 

 

 

Method of Activation

Loopback

Code

Description

Test Set

Craft Port

MODE/SEL

 

 

 

 

 

 

NLOC

1111000

DSX-1 signal is looped back to the network at the H2TU-C.

X

X

X

 

4-in-7

 

 

 

 

 

 

 

 

 

 

NREM

1110000

DSX-1 signal is looped back to the network at the H2TU-R.

X

X

X

 

3-in-7

 

 

 

 

 

 

 

 

 

 

CLOC

1111100

Signal from the customer is looped back to the customer

X

X

X

 

5-in-7

at the H2TU-R.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CREM

1111110

Signal from the customer is looped back to the customer

X

X

X

 

6-in-7

at the H2TU-C.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

COLB

 

Dual loopback at the H2TU-C. DSX-1 signal is looped back

 

X

X

 

 

to the network at the H2TU-C and signal from the customer

 

 

 

is looped back to the customer at the H2TU-C.

 

 

 

 

 

 

 

 

 

RULB

 

Dual loopback at the H2TU-R. DSX-1 signal is looped back

 

 

 

 

 

to the network at the H2TU-R and signal from the customer

 

X

X

 

 

is looped back to the customer at the H2TU-R.

 

 

 

 

 

 

 

 

 

SMJK LpUp

11000

SmartJack Loopup or NID payload (PL) code. Invokes

X

 

 

(PL)

2-in-5

H2TU-R loopback towards network.

 

 

 

 

 

 

 

 

 

 

 

 

 

SMJK LpUp

1111-1111-

SmartJack Loopup or NID (ESF-DL) code. Invokes

X

 

 

(ESF-DL)

0100-1000

H2TU-R loopback towards network.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SMJK LpDn

11100

SmartJack Loopdown or NID payload (PL) code. Removes

X

 

 

(PL)

3-in-5

SMJK, NLOC, NREM, CLOC, CREM, CRGx, and NRGx.

 

 

 

 

 

 

 

 

 

 

 

 

 

SMJK LpDn

1111-1111-

SmartJack Loopdown or NID (ESF-DL) code. Removes

X

 

 

(ESF-DL)

0010-0100

SMJK, NLOC, NREM, CLOC, CREM, CRGx, and NRGx.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HiGain systems feature the SmartJack option which can emulate a Network Interface Device (NID) for the purpose of loopback testing of the HiGain circuit. SMJK and NREM loopbacks perform the same functions, but their initiation differs. SMJK indicates that the loopback was initiated by the 2-in-5 inband command. NREM, on the other hand, is initiated by the 3-in-7 inband command or by a command issued from the maintenance terminal or the MODE and SEL buttons.

Use the inband commands to enable or disable the SMJK loopback options. The H2TU-C-388 system setting is normally enabled to recognize all inband SmartJack loopback commands.

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June 6, 2000

H2TU-C-388 List 1