T7264 datasheet(13/54 Pages) AGERE

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Lucent Technologies Inc.

Data Sheet

April 1998

T7264 U-Interface 2B1Q Transceiver

K2 Interface Description (continued)

K2 Bits Description

Table 4 summarizes the K2 interface bits which are

common to all conﬁgurations. The K2 frame consists of

eight octets of data. The ﬁrst three octets contain the

18 bits of 2B+D data. Bits 5—8 of the third octet contain

U frame and superframe timing (DF). Octet 4 (S1) is

reserved for future use and should always be set to 1.

Octets 5, 6, and 7 are directly mapped to the U-inter-

face M (UM) maintenance bits which are transparent to

the device, except the adea bit. Octet 8 is for device

status (DS) and device control (DC). These bits must

be manipulated according to the T1.601 standard to

obtain proper system-level operation.

Figure 11 describes the four different K2 interface for-

mats for DO and DI at the NT and LT. Tables 5—14 de-

scribe the position and meaning of the various bits on

the K2 interface. Tables 15 and 16 show the active logic

level for these bits, their value during reset/idle, and

their value when the transceiver is operational.

Table 4. K2 Interface Serial Data Bit Map

Bits marked with 1 should always be set to a 1. Bits marked as Rxx are reserved by T1.601 and should be set

to a 1.

* Items differ dependent upon NT or LT mode.

† Don't care.

Time ----------------------------------------------------------->

Symbol

Octet

Bit 1

Bit 2

Bit 3

Bit 4

Bit 5

Bit 6

Bit 7

Bit 8

B11

B12

B13

B14

B15

B16

B17

B18

B21

B22

B23

B24

B25

B26

B27

B28

RSF

TSF

UM1

UM2

act

R1, 5

R1, 6

UM3

R2, 5

R6, 4

nebe

xact

†

oof

rsksi

ccrc

istp

lpbk

afrst

ldea

sksi

xpcy

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