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T7264 Datasheet PDF : 54 Pages
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T7264 U-Interface 2B1Q Transceiver
Data Sheet
April 1998
K2 Interface Description (continued)
K2 NT and LT Timing Sources
In LT applications, all devices typically derive their tim-
ing from the same MTC. Additional logic in the LT, such
as a T7270, can provide concentration of multiple K2 in-
terfaces onto a single higher-speed highway.
In a PBX application, the U-interface loops can be used
as trunks. If more than one incoming U trunk is to be
used, additional circuitry may be needed to provide
elastic store, time-slot allocation, and master frame tim-
ing to synchronize the K2 interfaces received at each
trunk onto a common interface.
In NT1 applications, K2 frame timing is also derived
from the received 2B1Q data on the U loop. A T7264
chip can be connected to an S/T-interface device (such
as the T7252A) to form an NT1. Figure 10 shows the K2
interface connection in a CO application and NT1 appli-
cation. For terminal applications, the derived K2 timing
could be the source of all timing within the equipment (if
only a single U-interface is needed).
S/T
T7252A
F
C
DI
DO
NT1
VDD
T7264
MTC
F
C
DO NT
DI
2-WIRE U-
INTERFACE
K2 NT1 LOGIC
2-WIRE U-
INTERFACE
NT
CO SWITCH
T7264
MTC
F
C
DO
LT
DI
K2-TO-
SYSTEM
BACK-
F PLANE
C LOGIC
DI
DO
•••
T7264
MTC
F
C
DO
LT
DI
•••
K2-TO-
SYSTEM
F BACK-
C PLANE
LOGIC
DI
DO
Figure 10. K2 Interface LT and NT
5-5169
12
Lucent Technologies Inc.
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