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參數(shù)資料
| 型號： | T7264 |
| 英文描述： | T7264 U-Interface 2B1Q Transceiver |
| 中文描述： | T7264 U型接口2B1Q收發(fā)器 |
| 文件頁數(shù)： | 27/54頁 |
| 文件大?。?/td> | 876K |
| 代理商： | T7264 |
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Lucent Technologies Inc.
27
Data Sheet
April 1998
T7264 U-Interface 2B1Q Transceiver
K2 Functional Description
(continued)
The nebe, febe, rfebe, and ccrc Bits
Errors in the received 12-bit crc from the U-interface are
indicated via the nebe (near-end block error) bit. The
nebe bit is a local status bit that is set to 0 each time a
crc error is detected. Errors in transmitted crc can be
forced by setting the ccrc (corrupt crc) bit low. Because
the crc error detection and corruption is handled via the
nebe and ccrc bits, there is no need to have direct
control or access to the 12 crc bits via the K2 interface.
Normally, the T7264 automatically reflects the nebe bit
back to the far end as the ANSI-defined febe (far-end
block error) bit. The MODE1 pin (pin 11) and rfebe bit
can be used to alter the interaction between nebe and
febe as shown in Figure 19. Normally, MODE1 and
rfebe are HIGH, so febe is the direct result of the current
state of nebe. Now rfebe can be directly used to control
the state of febe.
The intended application for rfebe and MODE1 is one
having multiple U links as shown in T1.601-1992,
Figure E1. In this application, a performance monitoring
approach called path performance monitoring can be
used. This treats all links between the NT and LT as one
complete link, or path. Thus, any febes or nebes that
occur at an intermediate element should be propagated
to an endpoint. In this way, the febe and nebe counts at
the endpoints represent the performance of the system
as a whole.
Figure 20 shows how a multilink system with one inter-
mediate element (IE) could use MODE1, rfebe, nebe,
febe, and ccrc to propagate crc errors to the endpoints.
For simplicity, this figure represents only one direction
of propagation of nebe and febe, namely nebes propa-
gated toward the LT and febes propagated toward the
NT. This circuitry would be duplicated in the opposite
direction to form a complete system. At the endpoints,
MODE1 = 1 and rfebe = 1, so nebe and febe behave
normally. At IE, MODE1 = 0 so that rfebe, rather than
nebe, controls the state of febe toward the far end. For
clarity, the effect of MODE1 is shown as a coil control
for an SPDT relay that selects either nebe or V
CC
as the
upper input to the AND gate.
First, consider the case of a nebe occurring at the IE's
LT-mode T7264. This means that a crc error occurred
from NT to IE. The IE's K2 interface logic connects
nebe directly to the ccrc bit of the NT-mode T7264 to
force a ccrc error toward the LT. This will now show up
as a nebe at the LT, effectively propagating nebe from
IE to LT.
Now, at the LT, the nebe is reflected back toward the
IE as a febe. At the IE, the K2 interface logic connects
febe directly to the rfebe bit of the LT-mode T7264. This
generates a febe from IE to NT, completing the path for
the original crc error. Thus, the result of an error from
NT to IE is a nebe reported at the LT and a febe report-
ed at the NT. This illustrates how the two links and the
IE are treated as a single entity from a performance
monitoring standpoint.
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