stlc5465 STMicroelectronics, stlc5465 Datasheet - Page 31

• Manufacturer Part Number: stlc5465
• Description: Multi Hdlc With Switching Matrix Associated
• Manufacturer: STMicroelectronics

III - FUNCTIONAL DESCRIPTION (continued)
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+
- in transmission: 16 ISDN channels (B1+B2+B*).
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 GCI channels in any 16 “ISDN
channels”, TDM side.
The contents of B1 and/or B2 can be scrambled
or not. If scrambled the 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.
D+C/I)
It is possible to switch the contents of B1, B2 and
D channels from 16 “ISDN channels”, TDM side
STLC5465B
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