![](/images/new-backgrounds/1299213/29921357x1.webp)
Chapter 1. Introduction
DTE Interface Loopbacks
The Nx56k/64k serial interface offers a DTE loopback. See
Figure
DTE Loopback: loops all data from the DTE back towards the DTE. This loopback may be initiated by the DTE asserting the Local Loopback (LL) input on the connector or by using front panel or
DTE |
|
|
Loopback | TSU |
|
|
| |
|
| Nx56/64 |
|
| Interface |
T1 | Network Interface | Nx56/64 to |
network control | ||
| (NI) | circuit |
|
|
to DTE
Figure 1-8. DTE Interface Loopback
Pattern Generation
The TSU offers four available test patterns, All Ones, 3:24, and 511 and 1:8.
All Ones
Need definition
3 in 24
The 3:24 is a stress pattern which places the maximum number of 0s in the transmitted data. This is always done over all DS0s. This pattern is used in conjunction with external test equipment to determine if the T1 line is preforming acceptably under a stress condition.
TSU User Manual |