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Chapter 5. Configuration Menu
61200410L1-1B
ESU LT User Manual
43
CCS
CCS uses a 7-bit pattern called the Frame Alignment Signal
(FAS) to establish and maintain frame synchronization. The
FAS word is located in timeslot 0 of even frames. Odd
numbered frames may contain the Not FAS word (NFAS) in
timeslot 0. The ESU LT can be configured to require the NFAS
word for frame sync.
In CCS mode, there are 31 channels (timeslots 1-32) available
for user data. Timeslot 16 cannot be used to carry signaling
information in this mode.
CAS/TS16
CAS, also known as timeslot 16 multiframing, requires a
multiframe alignment signal to be present for frame sync.
The Multiframe Alignment Signal (MFAS) is inserted into the
16th timeslot of frame 0 of the 16-frame multiframe. The
MFAS word consists of four zeros, an unused bit, the
multiframe alarm bit and two more unused bits. Frames 1
through 15 carry the A,B,C and D bits for timeslots 1-15 and
17-32.
The ESU LT is designed for data transmission; therefore, the
signaling bits used for voice traffic are set to
A
LL
O
NES
.
In CAS mode, there are 30 channels available for user data. If
timeslot 16 is included in the unit’s mapping, it will be
disregarded. For example, if the starting TS0 is set to 1 and
the number of TS0s is set to 20, user data will be mapped to
timeslots 1 to 15 and 17 to 21.
UNFRAMED
The ESU LT can operate in unframed mode. In this mode,
user data is inserted into all 32 channels of the E1 stream.
Since the object of running without framing is to utilize the
full bandwidth of the E1 line, the starting TS0 and number of
TS0s option settings are ignored.
Other option settings that have no effect in unframed mode
include:
CRC4
,
NFAS W
ORD
,
RFA G
EN
,
A
UTO
DTE TX
CLK
,
M
APPING
,
D
ATA
I
NVERT
,
I
NBAND
.
Choices:
CCS
;
CAS/TS16
;
U
NFRAMED
Содержание 1200410L1
Страница 1: ...ESU LT User Manual Part Number 1200410L1 61200410L1 1B February 2003 ...
Страница 12: ...Table of Contents 12 ESU LT User Manual 61200410L1 1B ...
Страница 14: ...List of Figures 14 ESU LT User Manual 61200410L1 1B ...
Страница 16: ...List of Tables 16 ESU LT User Manual 61200410L1 1B ...
Страница 20: ...Chapter 1 Introduction 20 ESU LT User Manual 61200410L1 1B ...
Страница 28: ...Chapter 2 Installation 28 ESU LT User Manual 61200410L1 1B ...
Страница 34: ...Chapter 3 Operation 34 ESU LT User Manual 61200410L1 1B ...
Страница 40: ...Chapter 4 Status Menu 40 ESU LT User Manual 61200410L1 1B ...
Страница 64: ...Chapter 7 Test Menu 64 ESU LT User Manual 61200410L1 1B ...
Страница 79: ...Index 61200410L1 1B ESU LT User Manual 79 W wiring 69 ...
Страница 80: ...Index 80 ESU LT User Manual 61200410L1 1B ...