Adtran T1 CSU ACE User Manual download pdf (Page 25)

Chapter 1. General

61203022L1-1B T1 CSU ACE User Manual 25

LOOPBACK

The T1 CSU ACE supports four types of loopbacks. With the first two,

the unit loops the signal received from the network back to the network

and transmits an unframed

all 1s pattern to the CPE. The signal

received from the CPE is ignored.

The first type of loopback, Manual Network Loopback (see Table 1), is

initiated by switching on the

NET LB switch on the back of the unit. The

NET MAN LB LED will turn On and the loopback will continue until it

is switched off. See Figure 5 on page 26.

The second type of loopback, Network LB

, is activated by sending the

unit a

1-in-5 pattern (10000) from the network side for five seconds. The

NET RMT LB LED will turn On until it is cleared by sending a 1-in-3

pattern

(100) for five seconds. The patterns may be Unframed or

Framed (SF or ESF).

The third type of loopback, Manual Equipment Loopback

(see Table 1), is initiated by the

Equip LB switch on the back of the unit.

It will continue until

Equip LB is switched off. With the Equip LB, the

unit loops the signal received from the CPE equipment back to the CPE

equipment, and transmits an unframed

all 1s pattern to the network.

The signal received from the network is ignored. The

EQ MAN LB LED

will illuminate when the loopback is in progress. See Figure 5 on page

26.

The fourth type of loopback, Equipment Remote Loopback, is activated

by sending the unit a 1-in-5 pattern (10000) from the CPE side for five

seconds. The

EQ RMT LB will illuminate until it is cleared by sending a

1-in-3 pattern (100) for five seconds. The patterns may be

Unframed or

Framed (SF or ESF).

Table 1. Manual Loopbacks Switch Position Settings

LOOPBACK Type POSITION 6 POSITION 7

Network Up Down

Equipment Down Up

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 39 40

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Adtran T1 CSU ACE User Manual Page 25

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