STLC5465B datasheet(31/101 Pages) STMICROELECTRONICS

31 / 101 page

III - FUNCTIONAL DESCRIPTION (continued)

16 Rx

C/I

16 Rx

MON

16 Tx

C/I

16 Tx

MON

INTERR UPT

CONTR OLLER

GC I CHANNEL DEFINITION

DIN 5

DIN 4

DOUT 4

DOUT 5

SWITCHING

MATRIX

D Cha nne ls

to R x HDLC

DCha nne ls

from Tx HDLC

Interna l Bus

GC I1

GCI0

GCI1

GC I0

Figure 14 : D, C/I and Monitor Channel Path

III.3.6 - Scrambler and Descrambler

The TDM4 and TDM5 can be GCI multipexes.Each

GCI multipex comprises 8 GCI channels.Each GCI

channel comprises two B channels at 64 Kbit/s.

In reception it is possible to switch and to scramble

the contents of 32 B channels of GCI channels to

32 timeslots of the 256 output timeslots. In trans-

mission these 32 timeslots are assigned to 32 B

channels.

In the other direction the contents of an selected B

channels is automatically switched and descram-

bled to one B channel of 16 GCI channel.

See Connection Memory Data Register CMDR

(0E)H on page 74 (SCR bit).

Connection between “ISDN channels” and GCI

channels.

Three timeslots are assigned to one“ISDN chan-

nels”. Each “ISDN channels” comprises three

channels: B1+B2+B* with B*= D1,D2, A, E, S1, S2,

S3, S4. GCI channel to/from ISDN channel on

page 32.

Upstream. From GCI channels to ISDN channels

on page 33.

- in reception: 16 GCI channels (B1+B2+MON+

D+C/I),

- in transmission: 16 ISDN channels (B1+B2+B*).

It is possible to switch the contents of B1, B2 and

D channelsfrom 16 GCIchannels in any 16 “ISDN

channels”, TDM side.

The contents of B1 and/or B2 can be scrambled

or not. If scrambledthe number of the 32 timeslots

(TDM side) are different mandatory.

Receiving the contents of Monitor and Command

/ Indicate channels from 16 GCI channels. Primi-

tives and messages are stored automatically in

the external shared memory.

Transmitting “six bit word” (A, E, S1, S2, S3, S4)

to any 16 “ISDN channels” TDM side or not. See

SBV bit of General Configuration Register GCR

(02)H on page 68.

Downstream. From ISDN channels to GCI chan-

nels on page 34.

- in reception: ISDN channel (B1+B2+B*)

- in transmission: GCI channel (B1+B2+MON+

D+C/I)

It is possible to switch the contents of B1, B2 and

D channels from 16 “ISDN channels”, TDM side

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