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CSU/DSU MS DBU

Table 12-4. DTE With Test Pattern Commands

Front Panel AT Command Description

1=2047 PATTERN _T0&T8 Standard 2047 random data pattern.

2=511 PATTERN _T1&T8 Standard 511 random data pattern.

3=STRESS PTRN #1 _T2&T8 Stress pattern with alternating high and

low ones densities. Repeated pattern of

100 octets: 1111 1111, followed by

100 octets: 0000 0000.

4=STRESS PTRN #2 _T3&T8 Stress pattern with alternating medium

and low ones densities. Repeated pattern

of 100 octets: 0111 1110, followed by

100 octets: 0000 0000.

5=STRESS PTRN #3 _T4&T8 Stress pattern with medium ones density.

Continuous series of octets: 0011 0010.

6=STRESS PTRN #4 _T5&T8 Stress pattern with low ones density.

Continuous series of octets: 0100 0000.

12.3.1 DTE & L

OOP

(LL)

The DTE & Loop test splits the CSU/DSU MS DBU into two separate DTE and

loop interface sections and then loops the receive data of each interface back to its

respective transmit data. The DTE & Loop test provides a bidirectional loopback at

the DSU/CSU. Figure 12-5 illustrates the loopback points and the signal paths for

this test.

Figure 12-5. DTE & Loop Test.

LOCAL

DSU/CSU

DTE

TELCO

NET Rx

NET Tx

DTE Rx

DTE Tx

1 2 ... 74 75 76 77 78 79 80 81 82 83 84 ... 115 116

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