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Chapter 1. Introduction
511
The 511 pattern is generated and checked by the Nx56k/64k serial interface. It only appears in the DS0s assigned to the Nx56k/64k port. When used in conjunction with the payload loopback at the far end as previously described, an end to end integrity check can be made on the DTE ports.
1 in 8
The 1:8 pattern is used similarly to the 3:24. Each channel of the T1 has only one bit set.
Application
Using the V.35 DTE interface, a bridge or router can be interfaced to the network. The bandwidth used is programmable at Nx56 or Nx64 data rates for T1 or FT1 service. The bandwidth can be selected as contiguous or alternate. See Figure
Bridge Router | TSU | TSU | NX56/64 | Bridge Router |
NX56/64 | ||||
V.35 |
| (Public T1) | V.35 |
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Figure 1-9. Simple Bridge Application on a T1 or FT1 Circuit
TSU User Manual |