AVT Titan User manual

TITAN
Videocodec
ISDN Videocodec
Operator Manual

TITAN
VIDEOCODEC
ISDN VIDEOCODEC
OPERATOR MANUAL

ACKNOWLEDGEMENTS
LabWindows is a registered trade
mark of National Instruments
A Publication of
AVT Audio Video Technologies GmbH
Rathsbergstraße 17
D-90411 Nürnberg
Telephone [phone]
Telefax [phone]
Internet: http://www.avt-nbg.de
Email: [e-mail]
Printed in Germany, April 1997
AVT Audio Video Technologies GmbH
All rights reserved. Reproduction in
whole or in parts is prohibited without the
written consent of the copyright owner.
The information contained in this
publication is accurate to the best of AVT’
knowledge. However, AVT disclaims any
liability resulting from the use of this
information and reserves the right to
make changes without notice.
Service Hotline
In the unlikely event of technical problems, plea-
se do not hesitate to use our Service Hotline.
We will be happy to assist you.
The numbers are:
Telephone: [phone]
Telefax: ([phone]
Important note:
The TITAN videocodec should always be
transported in its original packaging.

040 7448 329657 (04.97) PC-SW 4.5
TABLE OF CONTENTS
TABLE OF CONTENTS
4
1 SYSTEM DESCRIPTION
8
1.1 General 8
1.2 System concept 9
1.3 Frame structure of non-ISDN connections 13
2 PUTTING THE SYSTEM INTO OPERATION
30
2.1 Mounting the TITAN videocodec 30
2.2 Connection to the video interfaces 30
2.3 Connection to the audio interfaces 30
2.4 Connection to the data interfaces 31
2.5 Selection of the network interface 31
2.6 Connection to the data network 32
2.7 Connection to the operator interfaces 32
2.8 Connection to the mains voltage 32
2.9 Opening the device 32
2.10 Setting the G.703 network interface 33
2.12 Switching on the system 34
3 OPERATION WITH A PC
40
3.1 Starting the software 41
3.2 Operating elements on the screen 42
4 OPERATION WITH THE OPERATOR PANEL
96
4.3 Programming example: Storing calling numbers and unit configurations for
ISDN connections 98
4.4 Programming example: Setting the RS232C or RS485 interface for PC
operation 101
5 COMMANDS
116
5.1 Structure of the commands 116
5.2 System responses 117
6 TTL INTERFACE APPLICATIONS
142
6.2 Printer mode 143
7 REMOTE OPERATION
146
7.1 Remote control via modems 146
7.2 Remote control via terminal adapters 148

040 7448 329657 (04.97) PC-SW 4.5
7.3 Remote control via the LSD channel 148
8 FACTORY SETTINGS
150
8.1 Video settings 150
8.2 Audio settings 151
8.3 Settings of the Interface Unit 151
8.4 Settings that are not stored 152
9 TECHNICAL DATA
154
9.1 Video 154
9.2 Audio 155
9.4 Line interfaces 157
9.6 Mechanical design 158
9.7 Power supply 158
9.8 Miscellaneous 158
A10 ANNEXE 1
CONFIGURATION OF THE TA-MULTI Configuration of the TA-Multi ter-
minal adapter for TITAN applications
160
A11 ANNEXE 2
EXTENSION OF RANGE OF FEATURES: UPDATE, UPGRADE
164
A11.1 Features extension of the network interface (upgrade) 164
A11.2 Update of unit and operating software 165
A11.3 Order forms 165
A12 ANNEXE 3
OPTION: ON SCREEN DISPLAY (OSD)
172
A12.1 Menu tree 173
A12.2 Menu operation 173
A12.3 MAIN menu 174
A12.4 CALL menu 175
A12.5 AUDIO menu 180
A12.6 VIDEO menu 181
A12.7 CAMERA menu 182
A12.8 GRAPHIC menu 184
A12.9 SETUP menu 185
A12.10 On screen display messages 188
A13 ANNEXE 4
OPTION: INVERSE MULTIPLEXER
AS PER ISO/IEC CD 13871
FOR 2 TO 6 B-CHANNELS
190
A13.1 Brief explanation of ISO/IEC CD 13871 and BONDING 190
A13.2 Use of ISO/IEC 13871 in the TITAN videocodec 192
A14 ANNEXE 5
Differences between Titan and Titan ISDN
194

040 7448 329657 (04.97) PC-SW 4.5
A14.1 General 194
A14.2 Interfaces 194
A14.3 Software 195
A14.4 Front Display 198
A15 ANNEXE 6
Connection of Cameras
200
A15.1 General 200
A15.2 CANON Camera VC-C1 200
A15.3 PANASONIC Camera 201
INDEX
202

040 7448 329657 (04.97) PC-SW 4.5

1–8040 7448 329657 (04.97) PC-SW 4.5
1 SYSTEM DESCRIPTION
1.1 General
The TITAN videocodec is designed for various videoconference applications.
With it, full-motion pictures, still pictures, speech signals and data signals can
be transmitted at bit rates from 56 kbit/s to 2 Mbit/s.
Due to its variety of interfaces, the TITAN videocodec can be operated in a
wide range of networks. Its use is not limited to videoconference applications.
The TITAN videocodec is excellently suitedfor monitoring purposes and also
for TV transmission.
In order to meet the requirements of the different applications, the TITAN
videocodec is available in three variants:
TITAN 2, TITAN 6 and TITAN 30.
The difference between the variants is the maximum transmission rate.
The TITAN 2, 6 and 30 videocodecs have maximum data rates of 128 kbit/s,
384 kbit/s and 1920 kbit/s respectively. An upgrading of the different variants
ispossibleonlyusingsoftware.Allthe interfacesandfunctionsdescribedhere
are provided in all variants.
Note The TITAN videocodec should always be transported inits ori-
ginal pakkaging.
FIGURE 1.1 TITAN VIDEOCODEC

1–9 040 7448 329657 (04.97) PC-SW 4.5
CHAPTER 1: SYSTEM DESCRIPTION
1.2 System concept
All plug-in units (including the power supply) of the TITAN videocodec are ac-
commodated in a housing (see FIGURE 1.1) with the dimensions 449 mm ×
133 mm (3 U) ×395 mm (W ×H ×D). TITAN can be installed as a table top
unit or, using mounting brackets, in 19" or ETSI racks. Sufficient ventilation is
ensured by ventilation holes located at the front and side of the housing.
The TITAN videocodec can be operated with AC voltages between 90 and
253 V (nominal voltage range 100 to 240 V) without the need for switching.
The mains frequency can also vary between 45 and 65 Hz. These tolerance
ranges mean that the codec can be used in almost every country. The maxi-
mum power consumptionis approx. 170 VA. Two temperature-controlledfans
have been built in for cooling purposes. Since the fans’speeds depend on the
temperature, they generate a minimum of noise.
In addition to the slot for the power supply, the TITAN videocodec has four
slots forthe followingplug-in units: Graphics Codec, Motion Video Codec, Au-
dio Codecand Interface Unit. The equipment also has a keypad and two-line
display, both of which are located on the front panel. FIGURE 1.1 shows a
view ofthe closed housing and FIGURE 1.2 shows a view of the opened unit.
In the following sections, the functions of the plug-in units are described in
more detail.
FIGURE 1.2 VIEW OF THE OPENED HOUSING OF THE TITAN VIDEOCODEC
1.2.1 Motion Video Codec
The motion video codec of the TITAN videocodec meets the requirements of
ITU-T Recommendation H.261. Both pictureformats specified inH.261: QCIF
(Quarter Common Intermediate Format) and FCIF (Full Common Interme-
diateFormat)havebeenimplemented.Theseformatsaresupportedupto the
maximum frame rate of 30 Hz.
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1–10040 7448 329657 (04.97) PC-SW 4.5
CHAPTER 1: SYSTEM DESCRIPTION
CVBS or Y/C signals can be used as input signals. CVBS or RGB signals are
provided at the output. ForCVBS signals, the video standards PAL and NTSC
can be selected independently of each other as the input and output signals
of the motion video codec.
Picture in picture (PIP) function
The motion video codecprovides the picture in picture (PIP)function.The PIP
function is realisedin the hardware. Theentire computing powerof the motion
video codec can thus be utilised for the motion video picture. Three PIP sizes
(tiny,smallandlarge)andfourPIPpositionscan beselected.Thebackground
picture and the PIP can be selected from a number of sources. TABLE 1.1
contains an overview:
TABLE 1.1 SELECTION POSSIBILITIES FOR PIP AND BACKGROUND PICTURE
1.2.2 JPEG graphics codec (option)
The JPEG graphics codec is intended for the transmission of documents and
pictures of objects with a very high resolution.
The graphics picture is transmitted in colour and with a resolution as defined
by ITU-R 601 (720 pixels ×576 lines).
Baseline is available as the JPEG mode.
In the baseline mode, the graphics picture is displayed only after the transmis-
sion of the complete picture.
The graphics picture is transmitted via a 64-kbit/s data stream in the HSD
(High Speed Data) channel.
The graphics codec also offers the possibility of displaying a cursor in the gra-
phics picture and drawing with this cursor. Every terminal has a cursor, the co-
lour and shape of which can be chosen. The graphics picture is overlaid with
a transparent picture in which the cursor can be used to draw (controlled by
the mouse). Since the drawing is in the overlay picture, it can be deleted inde-
pendently of the graphics picture.
The videoformatcan beset as either PAL orNTSCfor thegraphic and motion
video transmission.
CVBS or RBG signals are provided for the input and the output. The same
type of signals should be selected for both input and output, however.
1.2.3 Audio codec with video crossbar
This plug-in unit contains a complete audio processing circuit including an
echo canceller, an audio codec with various coding algorithms and a video
crossbar to control the inputs and outputs.
Background PIP
Received picture
Own picture
Received picture
Graphics picture
Graphics picture
Own picture
Received picture
Graphics picture
Preview –
JPEG Joint Photographic
Experts Group
JPEG standard
Standard for the trans-
mission of stationary
pictures

1–11 040 7448 329657 (04.97) PC-SW 4.5
CHAPTER 1: SYSTEM DESCRIPTION
Audio codec
The TITAN videocodec’s audiocodec encodes and decodes theaudio datast-
ream in accordance with the following standards:
Audio interfaces
The following audio interfaces are provided by the TITAN videocodec:
– 2 microphone inputs with digital mixer
– Line input and output
– Recorder interface for recording and playback
– Interface for an external telephone hybrid – Aux
– Connection for an active loudspeaker
– integrated echo cancellation
The transmitted and received sound is mixed and provided at the recorder in-
terface as one signal for recording. For playback, the signal from the recorder
is mixed into both the receive and the transmit circuits of the TITAN videoco-
dec.
Thesameprocedureisusedfortheexternaltelephonehybrid.Here,however,
an echo canceller has been integrated which cancels echo occurring in the
telephone line.
Echo cancellation
After all audio detectors (microphones) and loudspeakers have been installed
and the levels set, the TITAN videocodec can be used to measure the feed-
back and then calibrate the echo cancellation of the system set up. This
should be done before every video transmission.
Video inputs
The sockets for the video inputs of the TITAN videocodec can be assigned to
various signal types. There are four video input modes available for this pur-
pose. These are shown in TABLE 1.3.
TABLE 1.2 BANDWIDTHS AND DATA RATES OF THE AUDIO CODING STANDARDS
Standard Bandwidth Data rate
ITU-T G.711 a-Law 300 Hz to 3400 Hz 64 kbit/s
ITU-T G.711 µ-Law 300 Hz to 3400 Hz 64 kbit/s
ITU-T G.722 mode 2 50 Hz to 7000 Hz 56 kbit/s
ITU-T G.722 mode 3 50 Hz to 7000 Hz 48 kbit/s
ITU-T G.728a
a For the new interface unit (ID no. 229503) and from SW version 4.0 onwards
300 Hz to 3400 Hz 16 kbit/s
Philips “GSM”b
b Not for the new interface unit (ID no. 229503) with SW version 4.0.
300 Hz to 3400 Hz 16 kbit/s
TABLE 1.3 POSSIBLE INPUT SIGNALS FOR THE VIDEO INPUT MODE
CVBS 1 CVBS 2 CVBS 3 CVBS 4 CVBS 5 CVBS 6 Y/C RGB+S
++----++
++++- - -+
++- -+++-
++++++- -

1–12040 7448 329657 (04.97) PC-SW 4.5
CHAPTER 1: SYSTEM DESCRIPTION
The Y/C and RGBinterfaces are particularly important for the JPEG graphics
option and for high-quality video picture transmission, such as for the trans-
mission of TV signals.
Video outputs
The sockets of the video outputs can also be assigned to different signal ty-
pes. Forthe video outputs, thereare two different modes available.These are
shown in TABLE 1.4.
The RGB interface is especially suited as a high-quality video output (JPEG
graphics option or motion video codec for the transmission of TV signals, for
example).
1.2.4 Interface Unit 2 / 6 / 30
The only difference between the TITAN videocodec variants is in the software
(EPROM) of the Interface Unit. The multiplexer (designed in accordance with
ITU-T Rec. H.221 and H.242) and the system control are located on this plug-
in unit which also provides the network, data and operator interfaces.
An up to six-foldinband signalling (H.221 orH.331) has been implementedfor
ISDN transmission. This signalling enables a synchronisation between the
individual data channels, which is required because of the different transit
times in ISDN. Both bit and byte synchronisation are processed.
For E1/T1 transmissions, as well as for the 1x X.21 or RS449 interfaces,
H.221 inband signalling is used to report the assignment of the individual
timeslots of the frame to the remote end. The frame structure is shown in
SECTION 1.3.
TABLE 1.4 POSSIBLE OUTPUT SIGNALS FOR THE VIDEO OUTPUT MODE
CVBS 1 CVBS 2 CVBS 3 CVBS 4 CVBS 5 CVBS 6 RGB+S
++----+
++++++-

1–13 040 7448 329657 (04.97) PC-SW 4.5
CHAPTER 1: SYSTEM DESCRIPTION
Network interfaces
The following network interfaces are available:
– E1, 2-Mbit/s interface as per ITU-T Recommendation G.703 and G.704
– T1, 1.544-Mbit/s interface as per ITU-T Recommendation G.703 and
G.704
– RS449, n ×64 kbit/s to 1920 kbit/s or n ×56 kbit/s to 672 kbit/s
–1×X.21, n ×64 kbit/s to 1920 kbit/s or n ×56 kbit/s to 672 kbit/s
–6×X.21, 64/56 kbit/s
Data interfaces
The TITAN videocodec has threedifferent datainterfaces for the transmission
of additional data. All interfaces are implemented as DCEs.
– HSD for High Speed Data (64 kbit/s)
– LSD for Low Speed Data between 300 and 38400 Baud.
– TS16 (Time Slot 16) for dialling information in E1 networks
Operator interfaces
The following four operator interfaces are available for the control of the
TITAN videocodec:
– RS-232C / Mouse
–TTL
– RS-232C
–RS-485
1.3 Frame structure of non-ISDN connections
1.3.1 Frame structure of the E1 2-Mbit/s signal
Amultiplexframeofthe2-Mbit/ssignalconsistsof32timeslotswith8 bit each.
The frame length is 125 µs (the frame frequency is 8 kHz).
FIGURE 1.3 MULTIPLEX FRAME OF THE 2-MBIT/S SIGNALS
DTE Data Terminal
Equipment
DCE Data Circuit Equipment
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1–14040 7448 329657 (04.97) PC-SW 4.5
CHAPTER 1: SYSTEM DESCRIPTION
Timeslot 0 contains alternately the frame alignment signal and the service di-
gits. The frame alignment signal is for synchronisation, the service digits
transmit alarms to the remote end. Timeslot 16 is for the transmission of dial-
ling information and cannot be used for the transport of data.
Two different frame formats have been defined for the 2-Mbit/s data stream:
– the double-frame format
– the CRC4-frame format
The double-frame format corresponds exactly with FIGURE 1.3, in the CRC4
frame format, a so-called check bit is transmitted as the first bit of the frame
alignment word. In order to make optimum use of the capabilities of the con-
nectedterminals,the ITU-T Recommendation H.242has been fully integrated
in addition to H.221. For unidirectional connections, the ITU-T Recommenda-
tion H.331 is used. This informationis transmittedin timeslot 1. The inband si-
gnalling as per H.221/H.242 or H.331 is repeated every 80 frames (10 ms). In
the first 16 frames, the eighth bit is used for inband signalling (=1.6 kbit/s).
The remaining seven bits in timeslot 1 of eachframe, as well asthe eighthbits
of frames 17 to 80 can be used for other signals (see FIGURE 1.4).
FIGURE 1.4 POSITION OF INBAND SIGNALLING WITHIN THE 2-MBIT/S DATA STREAM
1.3.2 Frame structure of the T1 1.544-Mbit/s signal
The frame structure is as defined in ITU-T G.704.
Note: In T1 Restricted mode (56 kbit/s), the a/b bits (see Rec. G.704) are set
to 0/0 in unused channels and to 1/1 in used channels. The data in unused
channels is 0111111.
1.3.3 Frame structure of the data stream as per X.21 and RS449
The frame structure for 1 ×X.21 and for RS449 is similar to that of E1. The
number of available timeslots, however, depends on the data rate of the trans-
mission path. A network clock of 256 kHz, for example, can be used to trans-
mit 256 kbit/s which corresponds to four timeslots at 64 kbit/s. FIGURE 1.5
shows the multiplex frame for a network clock of 384 kHz (=6 timeslots at
64 kbit/s).
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1–15 040 7448 329657 (04.97) PC-SW 4.5
CHAPTER 1: SYSTEM DESCRIPTION
FIGURE 1.5 MULTIPLEX FRAME FOR THE NETWORK INTERFACES 1 ×X.21 AND
RS449 FOR A NETWORK FREQUENCY OF 384 kHz
The inband signalling is also transmitted in timeslot 1 in this frame. The posi-
tion of the inband signalling is the same as that in the 2-Mbit/s data stream. It
is also shown in FIGURE 1.5.
1.4 System components list
The equipping of the TITAN system depends on the application. FIGURE 1.6
shows the front view of the opened TITAN housing with the position of the dif-
ferent units. TABLE 1.5 is a list of all plug-in units belonging to the TITAN sy-
stem with the ordering information.
FIGURE 1.6 FRONT VIEW OF THE TITAN VIDEOCODEC
WITHOUT FRONT PANEL AND DISPLAY UNIT
TABLE 1.5 SYSTEM COMPONENTS LIST
Item Designation
1 TITAN power supply module
2 JPEG graphics codec (option)
3 Motion video codec
4 Audio codec with echo cancellation
5 Interface unit
6 Videocodec (housing and front panel)
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1–16040 7448 329657 (04.97) PC-SW 4.5
CHAPTER 1: SYSTEM DESCRIPTION
1.5 Interfaces
The TITAN videocodec has a large number of back-panel connectors. These
connectors realise various interfaces, depending onapplication. FIGURE 1.7
shows the rear view of the codec. The socket designations in the following ta-
bles correspond to the labelling on the unit.
FIGURE 1.7 REAR VIEW OF THE TITAN VIDEOCODEC (CONNECTORS)
1.5.1 Audio interfaces
Level settings can bemadein steps of 1.5 dB. Thelevels indicatedare always
referred to 600 Ω, i.e. a level of 0 dBm corresponds to 0.775 Vrms
TABLE 1.6 AUDIO INTERFACE SOCKETS
Socket Function
MIC 1 / MIC 2 Microphone inputs
Line In Line input
Line Out Line output
Rec In / Out Video recorder interface (audio)
Tel In / Out Interface for external telephone hybrid
SP Output for active loudspeaker
Socket: Mic 1 / Mic 2 (XLR)
Connect. Signal Electrical characteristics
1GND Audio
Level: –78 to –32 dBma
Impedance: 600 Ω, sym.
Phantom circuit (switchable)
Voltage: 13.5 V DC
Int. resistance: 2.13 kΩ
a Factory setting: –63 dBm
2Audio a
3Audio b
Socket: LINE in (XLR)
Connect. Signal Electrical characteristics
1GND Audio
Level: –16 to +6 dBmab
Impedance: 600 Ω, sym. or
20 kΩ, sym.
a Factory setting: 0 dBm
b Level setting only possible in connection with echo cancellation
2Audio a
3Audio b
Note: Impedance selection by jumper; centre GND by jumper
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1–17 040 7448 329657 (04.97) PC-SW 4.5
CHAPTER 1: SYSTEM DESCRIPTION
1.5.2 Video interfaces
The video inputs are configurable in three modes. One socket is assigned to
different signals, depending on the mode. The socket assignment for the va-
rious modes is shown in TABLE 1.7 and TABLE 1.8 for the inputs and outputs
respectively.
Socket: LINE out (XLR)
Connect. Signal Electrical characteristics
1GND Audio
Level: +6 to –88.5 dBmabc
Impedance: ~120 Ωsym.
a Factory setting: 0 dBm
b Level setting only possible in connection with echo cancellation
c For termination with 600 Ω, the effective level is approx. 1.5 dB than the displayed level
2Audio a
3Audio b
Note: Centre GND by jumper
Socket: Speaker (Cinch)
Connect. Signal Electrical characteristics
1Audio Audio
Level: +2 to –92 dBma
Impedance: <50 Ω,unsym.
a Factory setting: 0.5 Vrms
2GND
Socket: Tel. out / VCR out (Cinch)
Connect. Signal Electrical characteristics
1Audio Audio
Level: –1 to –95 dBma
Impedance: <50 Ω,unsym.
a Factory setting: 0.25 Vrms
2GND
Socket: Tel. in / VCR in (Cinch)
Connect. Signal Electrical characteristics
1Audio Audio
Level: –1 to –23 dBma
Impedance: 47 kΩ,unsym.
a Factory setting: 0.25 Vrms
2GND
TABLE 1.7 SOCKET ASSIGNMENT OF THE VIDEO INPUTS
Socket
Mode CVBS1 CVBS2 Y C R G B SYNC
1CVBS 1 CVBS 2 Y C R G B Sync
2CVBS 1 CVBS 2 CVBS 3 CVBS 4 R G B Sync.
3CVBS 1 CVBS 2 Y C CVBS 5 CVBS 6 * *
4CVBS 1 CVBS 2 CVBS 3 CVBS 4 CVBS 5 CVBS 6 * *
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1–18040 7448 329657 (04.97) PC-SW 4.5
CHAPTER 1: SYSTEM DESCRIPTION
TABLE 1.8 SOCKET ASSIGNMENT OF THE VIDEO OUTPUTS
Socket
Mode CVBS1 CVBS2 R G B SYNC
1CVBS 1 CVBS 2 R G B SYNC
2CVBS 1 CVBS 2 CVBS 3 CVBS 4 CVBS 5 CVBS 6
Signal: CVBS in/out (BNC socket)
Connect. Signal Electrical characteristics
1Video – CVBS Standard: PAL / NTSC
Amplitude: 1 Vpp ±10%
Impedance: 75 Ω, unsym.
Cable type: RG 59
Range: 15 m
2GND
Signal: YC in (BNC socket)
Connect. Signal Electrical characteristics
1Video– LuminanceandChrominance Amplitude: 1 Vpp ±10%
Impedance: 75 Ω, unsym.
Cable type: RG 59
Range: 15 m
2GND
Signal: RGB in/out (BNC socket)
Connect. Signal Electrical characteristics
1Video – Red/Green/Blue Amplitude: 0.7 Vpp ±10%
Impedance: 75 Ω, unsym.
Cable type: RG 59
Range: 15 m
2GND
Signal: Sync. in (BNC socket)
Connect. Signal Electrical characteristics
1H. + V. synchronising signal Amplitude: 0.7 to 1.4 Vpp
Impedance: 75 Ω, unsym.
Accuracy: ±50 ppm
Cable type: RG 59
Range: 15 m
2GND
Signal: Sync. out (BNC socket)
Connect. Signal Electrical characteristics
1H. + V. synchronising signal Signal Synchronisation
Amplitude: 1.4 Vpp ±10%
Impedance: 75 Ω, unsym.
Cable type: RG 59
Range: 15 m
2GND
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1–19 040 7448 329657 (04.97) PC-SW 4.5
CHAPTER 1: SYSTEM DESCRIPTION
1.5.3 Network interfaces
The TITAN videocodec has a large number of network interfaces and can the-
refore be used in a wide range of network environments. With the exception
of the X.21 interfaces 4 to 6, all interfaces are available simultaneously. Only
one interface type (X.21, E1, T1, RS449) can be active at any given time,
however. The above-mentioned X.21 interfaces can be accessed via two ad-
apter cables which are part of the delivery. If these interfaces are used, then
the RS449 and TS 16 interfaces cannot be used.
1.5.3.1 X.21 interfaces
The TITAN videocodec has up to six X.21 interfaces. Three of these X.21 in-
terfaces can be directly accessed on the rear panel. The other three are pro-
videdviaadaptercablefromtheRS449interfaceandthe TS16datainterface.
The X.21interfaces allow access to transmission networks and are data inter-
faces with bit clocks (a byte clock can be used if it is provided by the network).
The X.21interfaces can beused in three modes whichare described in detail
in the following.
X.21 Mode 1 (1 ×X.21)
In this operating mode, only the “X.21/Main” interface is available with data ra-
tes from 561to 1920 kbit/s. This is a DTE interface which requires as a trans-
port medium a line in which the data is switched en bloc.
X.21 Mode 2 (1..6 ×X.21): ISDN Mode
In X.21 Mode 2, up to six X.21 interfaces operating at 56/64 kbit/s can be
used. The X.21 dialling protocol (only for 64 kbit/s) is supported fully for each
interface. Thus itis possible totransmitup to 384 kbit/s via aterminal adapter
in the ISDN. The B channels (which might be routed differently) are recombi-
ned on the receive side to a common data stream. The transit time compen-
sation (600 ms.maximum) iscarried out by the integratedInverse Multiplexer
in accordance with ITU-T Recommendation H.221.
X.21 Mode 3 (ISDN LEASED LINE)
As with mode 2, but without dialling procedure. One to six 56-kbit/s channels
are also available.
1 From SW-Version 4.0

1–20040 7448 329657 (04.97) PC-SW 4.5
CHAPTER 1: SYSTEM DESCRIPTION
Plug: X.21/Main and X.21 no. 2 to X.21 no. 6 (SUB-D 15pole)
Connect. Signal Electrical characteristics
1SHIELD Shield Type: DTE
Level: V.11, symmetrical
Data rate: 56 to 1920 kbit/s
for X.21/Main
56/64 kbit/s for other
X.21 interfaces
Range: 100 m
2Ta Transmit a
3Ca Controla
4R a Receive a
5I a Indicate a
6S a Signal Element Timing a
7B a Byte Timing a
8GND Ground
9T b Transmit b
10 Cb Controlb
11 R b Receive b
12 I b Indicate b
13 S b Signal Element Timing b
14 B b Byte Timing b
15 not connected
Note: No. 4 available via adapter cable 3361 328252 at the TS16 interface
No. 5 and 6 available via adapter cable 3361 328253 at the RS449 interface
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