Black Box Sprint 2 Series User manual

Sprint 2 Time-Division Multiplexer
Sept 96 / Version 1.1
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4-Port X.21 Composite Sprint 2 TDM:
MXU9010
MXF9504-V11 France Only)
8-Port X.21 Composite Sprint 2 TDM:
MXU9011
4-Port RS232/V.24 Composite Sprint 2 TDM:
MXU9012
8-Port RS232/V.24 Composite Sprint 2 TDM:
MXU9013
4-Port V.35 Composite Sprint 2 TDM:
MXU9014
MXF9504-V35 France Only)
8-Port V.35 Composite Sprint 2 TDM:
MXU9015

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2
Sprint 2 Time-Division Multiplexer

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3
Sprint 2 Time-Division Multiplexer

SALES: 0118 965 5100
ARNING - BEFORE
INSTALLATION,
PLEASE REFER TO SAFETY INSTRUCTIONS IN
APPENDIX A, AND EMC INSTRUCTIONS IN APPENDIX
C
Certified Compliant in the EC, when fitted in accordance with the installation instructions,
against the following directives/standards:
Low Voltage Directive 73/23/EEC and amendment 93/68/EEC)
EN60950 : 1992 Safety)
Electromagnetic Compatibility directive 89/336/EEC and subsequent
amendments to date):
EN55022 : 1994 Emissions)
EN50082-1 : 1992 Immunity)
Telecommunications Terminal Equipment directive 91/263/EEC and
amendment 93/68/EEC) where indicated in approvals requirements section.
4
SPRINT 2
Voice & Data Multiplexer
User Manual
Sprint 2 Time-Division Multiplexer

TECHNICAL: 0118 931 2233
!! IMPORTANT - Use in USA & Canada !!
References to Voice
Please note that within this manual, all references to Voice or the X21/V11
channel port refer to options which are not available for use in the U.S. or
Canada.
Safety
Units bearing the mark and mark
are LISTED by Underwriters
Laboratories Inc. to U.S. and Canadian Safety Standards.
Electromagnetic Emissions & Immunity
NOTE: This Equipment has been tested and found to comply with the limits for
Class B digital devices, pursuant to part 15 of the FCC rules. These limits are
designed to provide reasonable protection against harmful interference in a
residential installation. This equipment generates, uses and can radiate radio
frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications.
However, there is no guarantee that interference will not occur in a particular
installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off and
on, the user is encouraged to try to correct the interference by one or more of
the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and the receiver.
- Connect the equipment into an outlet on a circuit different from
that to which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.
Caution:
Changes or modifications not expressly approved by the manufacturer of this
product could void the user's authority to operate this equipment.
5
Sprint 2 Time-Division Multiplexer

SALES: 0118 965 5100
Contents
Contents...................................................................................................................... 6
Introduction................................................................................................................. 8
Sprint 2 Applications......................................................................................... 8
V.24 Low Speed Data Only.................................................................... 9
Hi h Speed X.21/V.11 & V.24 Data....................................................... 9
Technical Features.................................................................................................... 11
Sprint 2 Throu hput/Efficiency....................................................................... 11
Data Format.................................................................................................... 11
Synchronous Data............................................................................... 11
Asynchronous Data............................................................................. 11
Frame Len th................................................................................................. 12
Frame Structure.............................................................................................. 12
Composite Rates 32.8Kbps - 64Kbps.................................................. 12
Composite Rates 4.8 - 32Kbps............................................................ 13
Synchronisation.............................................................................................. 13
Composite Link Rates.................................................................................... 13
Round Trip Pollin Delay................................................................................ 13
Interface Si nals/Sample Rate....................................................................... 13
Use And Confi uration.............................................................................................. 14
Data Channel Connection.............................................................................. 14
Default Channel Setup................................................................................... 14
Chan in the Confi uration............................................................................ 14
Supervisor Terminal Requirements................................................................ 14
Supervisor Terminal Emulations..................................................................... 15
Confi uration Display Layout.......................................................................... 15
General Keyboard Conventions..................................................................... 16
Cursor Movement................................................................................ 16
Chan in Parameters.......................................................................... 17
Acceptin Chan es and Updatin the Confi uration........................... 17
Abandonin Chan es.......................................................................... 17
Local or Remote Confi uration............................................................ 17
Screen Messa es................................................................................ 17
Error Messa es................................................................................... 18
Data Channel Confi uration........................................................................... 18
Copyin A Channel Setup.............................................................................. 19
Inte ral X.21/V.11 Data Channel............................................................................... 24
Technical Overview........................................................................................ 24
Confi uration Procedure................................................................................. 24
Installation................................................................................................................. 25
Supply Volta e & Connection......................................................................... 25
Environmental Considerations........................................................................ 25
Mechanical Construction................................................................................ 25
Composite Interface Selection........................................................................ 26
Composite Network Connection..................................................................... 26
Composite Link Parameters........................................................................... 26
Troubleshootin ......................................................................................................... 27
Front Panel LEDs........................................................................................... 27
Dia nostics & Loopbacks............................................................................... 28
6
Sprint 2 Time-Division Multiplexer

TECHNICAL: 0118 931 2233
Self Test Procedure............................................................................. 28
Back-To-Back Testin ......................................................................... 29
Appendix A - Safety Requirements.......................................................................... 30
Appendix B - Approval Requirements....................................................................... 33
Appendix C - EMC Requirements............................................................................. 35
Limitation of Emissions:.................................................................................. 35
Data Connections........................................................................................... 35
Mains Connection........................................................................................... 35
To Ensure Adequate Immunity is Achieved:................................................... 35
Appendix D - Rear Panel Layout............................................................................... 37
Appendix E - Supervisor Port Pinout......................................................................... 38
Appendix F - Composite Link DB15 Pinout............................................................... 39
Appendix G - Composite Back To Back Test Cables................................................ 40
X.21/V.11 Test Cable..................................................................................... 40
X.21bis/V.35, V.24 and V.36 Test Cables...................................................... 40
G.703 Test Cable........................................................................................... 41
Appendix H - Data Channel Pinout........................................................................... 42
Appendix I - Network Composite Cables................................................................... 43
Appendix J - Technical Specification......................................................................... 47
7
Sprint 2 Time-Division Multiplexer

SALES: 0118 965 5100
Introduction
The Sprint 2 is a four or eight channel time division multiplexer offering users voice and data
integration over digital links up to 64Kbps.
Both local and remote units may be easily configured from one end of the link, using a
terminal or PC terminal emulation software.
The V.24 data channels will support synchronous and asynchronous data rates of up to
28.8Kbps. An X.21/V.11 data channel is optionally available to replace the eighth V.24
channel and will support rates up to 48Kbps.
This user manual covers installation and setup of user options for the multiplexer. Cable
specifications are detailed in the appendices.
The composite link has a plug-in selectable interface X.21/V.11, V.24, G.703 or V.35)
which must be specified at the time of ordering the equipment.
Sprint 2 Applications
8
Sprint 2 Time-Division Multiplexer

TECHNICAL: 0118 931 2233
The Sprint 2 can be used in many applications, from simple asynchronous V.24 data transfer
through to a complicated mix of low speed V.24 and high speed V.11 data with up to two
voice channels. The low price of the basic unit and options give users the opportunity to
maximise the benefits of their networking budget.
V.24 Low Speed Data Only
The simplest use of the Sprint 2 is the interconnection of data devices such as below;
Up to eight synchronous or asynchronous devices can be connected to a central computer in
this fashion when bandwidth allows. Bit stripping gives the Sprint 2 the ability to transmit
eight asynchronous 9.6Kbps data channels through a 64Kbps link.
High Speed X.21/V.11 & V.24 Data
Many applications will require a combination of data types. The Sprint 2 LANLink will
support a synchronous X.21/V.11 data channel in addition to seven V.24 ports. This can be
used to connect a cluster controller alongside several asynchronous terminals as shown in the
next diagram.
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Sprint 2 Time-Division Multiplexer

SALES: 0118 965 5100
This high speed X.21/V.11 port could also be used to split bandwidth between some low
speed peripherals and a Remote LAN Bridge such as is shown in this diagram below.
10
Sprint 2 Time-Division Multiplexer

Technical Features
Sprint 2 Throughput/Efficiency
Data throughput may be easily calculated. The overhead for composite rates above 32.8Kbps
is 1600bps. For rates below 32.8Kbps, the overhead is halved. For example, a composite
rate of 28.8Kbps will yield a throughput of 28Kbps.
Link Rate (Kbps) Efficiency (%) Throughput (Kbps)
64 97.5 62.4
19.2 95.83 18.4
Data Format
Synchronous Data
The internally generated data channel clocks are derived from the composite link clock rate.
Each data channel has a flexible input buffer size depends on bit rate) to allow external clock
plesiochronous) operation.
Asynchronous Data
Asynchronous data is transmitted across the composite link as synchronous data with each
character occupying eight bits in the aggregate frame irrespective of structure. Data parity is
regenerated at the remote end. When the data channel is in idle or break condition the
aggregate is padded with one of two non-ASCII codes 0BAh and 0BBh). If these codes are
received by the data channel they are coded and appended with an escape character 0BCh) to
allow them to pass across the aggregate link.
By stripping start, stop and parity bits from data, the Sprint 2 reduces the number of data bits
transferred across the composite link. An asynchronous channel with a word structure of
81N will discard two bits and transfer eight useful characters, thus requiring 80% of the
nominal bandwidth, or 7680bps for a 9600bps channel.
In practice the composite link is allocated in 800bps slots, so this channel actually uses
8000bps. When applied across all eight channels the following combinations are possible.

Asynchronous Compression Rates
64Kbps Composite 19.2Kbps Composite 28.8Kbps Composite
8 x 9600 Async 2 x 9600 Async
1 x 2400 Async/Sync
3 x 9600 Async
1 x 2400 Async
1 x 1200 Async
7 x 9600 Async
1 x 9600 Sync
2 x 9600 Async
1 x 2400 Async
3 x 9600 Async
1 x 4800 Async
1 x 2400 Async
6 x 9600 Async
1 x 19200 Sync
Frame Length
Frame length is 160 bytes at 64Kbps i.e. a byte has an equivalence of 400bps. The frame
length is reduced at lower data rates to maintain a constant frame duration of 20ms.
Link Rate (Kbps) Frame Length (Bytes) Frame Duration (ms)
64 160 20
19.2 48 20
Frame Structure
Composite Rates 32.8Kbps - 64Kbps
4 x 40 Bytes at 64Kbps
S1DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD
C1DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD
C2DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD
C3DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD
S1Synchronising byte
C1 - C3Configuration bytes
DData bytes

Composite Rates 4.8 - 32Kbps
2 x 24 Bytes at 19.2Kbps
S1DDDDDDDDDDDDDDDDDDDDDDD
C1DDDDDDDDDDDDDDDDDDDDDDD
S1 Synchronising byte
C1Configuration byte
DData Byte
Synchronisation
Synchronisation will occur after receipt of a superframe, i.e. 80ms, irrespective of the
composite data rate. A super-frame comprises four composite frames, each of which has a
different sync character.
Composite Link Rates
The composite data rate can be selected in increments of 800bps from 4.8Kbps to 64Kbps.
This allows most efficient use of data bandwidth if multiplexers are daisy chained.
Round Trip Polling Delay
Round trip delay is defined as the time interval which elapses when a "poll" from a computer
is transmitted from one of the low speed data ports of the multiplexer, through the composite
link, and then looped at the remote multiplexer to return to the computer. This is generally
referenced when the computer data is transmitted through a 9.6Kbps channel. The Sprint 2
has a delay of only 12ms at all link rates.
Interface Signals/Sample Rate
The Sprint 2 units sample and transmit the RTS and DTR signals from all 4 or 8 channels
approximately every 230ms via the configuration bytes. If the full data bandwidth is not
allocated, the residual is used to pass the interface signals, reducing delay to less than 15ms
800bps residual) or 10ms >2400bps residual) respectively.
Therefore if the requirement is for onward linked, half duplex communication it is essential
to leave some bandwidth unused to speed up the interchange of control signals. If the IBM
Bisync protocol is being transmitted it is recommended that 2.4Kbps of data bandwidth is
unused.

Use And Configuration
This section covers connection and set-up of the channel data ports. The composite port is
covered in the Installation section of this manual.
Data Channel Connection
Low speed peripherals are connected to the V.24/V.28 and X.21/V.11 where the High Speed
Data option is fitted) DB25 connectors configured DCE and numbered 1 to 8 at the rear of
the multiplexer. The pin connections for these data channels are defined in the Appendix.
Default Channel Setup
On delivery all V.24 channels are configured as follows;
Rate : 4800bps
Type : Synchronous
Clocks : Internal
Signals : Both+
RTS/CTS Delay : 0ms
Changing the Configuration
The Sprint 2 may be configured using an asynchronous terminal. A laptop PC running an
asynchronous terminal emulation program such as PCAnywhere, CrossTalk or Blast is
ideal for the field engineer. The terminal should be connected via its serial port to the
SUPERVISOR port on the rear of the multiplexer.
Supervisor Terminal Requirements
The 9.6Kbps terminal must be configured for soft flow control with an 8 bit word, one stop
bit, and no parity 81N.)
The Supervisor Port pinout is defined in Appendix E.

Supervisor Terminal Emulations
Several terminal emulations are supported by the Sprint 2. When connection is made
between the terminal or PC and the rear panel port labelled SUPERVISOR, the following
screen will appear:
The terminal type or emulation in use should be selected by pressing the relevant number key
on the PC or terminal. The monitor will now show the basic configuration screen for the
multiplexer setup. On the Sprint 2 LANLink this is formatted as below. This display for the
Sprint 2 shows standard V.24 data channels only.
SPRINT 2 TDM xxxxAE/x.xx
Mode : RUN
Data Monitor : RXD
Link Clock : AUTO 64000
X.21 Carrier : PRESENT
Residual : +24000
Option Cards : NONE
Configure : >ACCEPT
Display Page : LOCAL
COPY CHANNEL : 1 2 3 4 5 6 7 X.21
RATE : 4800 4800 4800 4800 4800 4800 4800 4800
TYPE : SYNC SYNC SYNC SYNC SYNC SYNC SYNC SYNC
RX CLOCK : INT INT INT INT INT INT INT INT
TX CLOCK : INT INT INT INT INT INT INT INT
BITS/CHAR :
PARITY :
RTS/CTS DLY : 0ms 0ms 0ms 0ms 0ms 0ms 0ms 0ms
SIGNALS : BOTH+ BOTH+ BOTH+ BOTH+ BOTH+ BOTH+ BOTH+ BOTH+
CHANNEL MODE : RUN RUN RUN RUN RUN RUN RUN RUN
Use cursor keys to select parameter, SPACE/- to toggle
Configuration Display Layout
Please select terminal type from the following:
1 = VT52/HP2600
2 = ANSI/VT100/VT200
3 = ADDS
4 = ADM-3A
5 = HAZELTINE 1500
6 = NEWBURY 8009
7 = TELEVIDEO 912/920

There are two main areas on the supervisor set-up screen used to change parameters for the
Sprint 2.
Upper left -
System parameters Mode, Link
Clock, Carrier, Residual, and Configure).
Bottom -
Channel configuration.
General Keyboard Conventions
Only a few keys are required to configure the Sprint 2 multiplexer. They are summarised as
follows.
→ Right arrow) Moves the cursor to the next field to the right.
← Left arrow) Moves the cursor to the next field to the left.
↑ Up arrow) Moves the cursor to the next field upwards.
↓ Down arrow) Moves the cursor to the next field downwards.
<SPACEBAR> Toggles the parameter value up to the next available
setting.
<ENTER> or <RETURN> Moves the cursor back to the CONFIGURE line.
<CTRL> and C Abandons all changes since last update.
<CTRL> and A Enables access to composite links settings.
Cursor Movement

The cursor symbol ">" is moved around the screen to the required field using the arrow
keys.
Changing Parameters
If it is possible to modify the field over which the cursor is placed pressing the
<SPACEBAR> will toggle through the parameters available. Link parameters are only
adjustable if <CTRL> and A are keyed in advance. No change is possible if the field is
calculated, unchangeable or hardware set.
Pressing the <SPACEBAR> will toggle through the choices available for a parameter.
Accepting Changes and Updating the Configuration
If the CONFIGURE parameter is selected to ACCEPT after the configuration has been
suitably adjusted, the configuration is updated at the local and remote end as necessary and
held in Non-Volatile Memory NVRAM.)
Abandoning Changes
Pressing <CTRL> and <C> together at any point before a configuration is updated will cause
all modifications to be abandoned and the last updated configuration will be represented on
the screen.
Alternatively if the cursor remains unmoved for thirty seconds when in ENTER mode, the
cursor marker will automatically return to the CONFIGURE line and revert to ACCEPT.
The original configuration is maintained and any parameter changes will be lost.
Local or Remote Configuration
Most settings are independent at each end of the multiplexer link e.g. Signals, Clocks, and
Rates. The "Display Page" parameter in the upper left of the selected screen shows whether
the LOCAL or REMOTE multiplexer is being configured.
Screen Messages

The bottom of the configuration screen displays status messages as appropriate. When the
CONFIGURE line is set to ACCEPT the following line will normally appear:
Use cursor keys to select parameter, SPACE/- to toggle
Two additional lines appear when the CONFIGURE line is set to ENTER, as follows:
Type <CTRL>&A to enable access to link parameters
Use cursor keys to select parameter, SPACE/- to toggle
Select ACCEPT to apply changes, type <CTRL>&C to abort
If <CTRL> and A are keyed simultaneously then the top line changes to:
Type <CTRL>&A to enable access to link parameters
If the remote unit is put into a composite loopback mode the local unit can not be configured
and the following message is displayed:
Looping data back to remote - Keyboard Disabled
Error Messages
Error messages take precedence over any existing message and always appear on the top of
the three previously described lines. The possible error conditions are as follows:
WARNING - MAXIMUM AGGREGATE SPEED EXCEEDED
WARNING - LOCAL AND REMOTE SET-UPS DO NOT MATCH
Data Channel Configuration
The display shows parameters for eight data channels CH1 to CH8. Each data channel has
parameters selectable as shown in the following table.

Copying A Channel Setup
Channel data may be copied from another similar data channel, by placing the cursor over the
channel number field of the channel to be changed.)
The <SPACEBAR> allows you to toggle through each available channel so that the setup
may be copied.

Configuration Display Definitions
Parameter Display Options Description
Mode RUN
LOCAL
LOOPBACK
REMOTE
LOOPBACK
Composite link operation mode
Data Monitor RXD LEDs show RECEIVE data activity
TXD LEDs show TRANSMIT data activity
RXD/TXD LEDs show TRANSMIT and RECEIVE data
activity
With X.21 Composite Interface Selected
Link Clock EXT xxxxx Link clock external, manually set
AUTO xxxxx Link clock external, automatically calibrated
INT xxxxx Link clock internally generated
xxxx 4800
xxxx 64000
Composite clock rate in 800bps steps
X.21 Carrier PRESENT The multiplexer is receiving clock from the link if
EXT/AUTO is set) and is also communicating with
the remote multiplexer.
LOST There is no communication between the local and
remote multiplexers.
With V.24, V.35 or G.7 3 Composite Interface Selected
Link TXC AUTO xxxxx External link clock automatically calibrated
RXC xxxxx External link clock turn around mode
EXT xxxxx External link clock manually set
INT xxxxx Internally generated link clock
xxxx 4800
xxxx 64000
Composite clock rate in 800bps steps