AE1 - AlphaCom Digital Network Board

AE1 - AlphaCom Digital Network Board

The AE1 board provides AlphaCom with two E1 or T1 telecom interfaces. The AE1 board in an integrated board which fits into the AlphaCom back plane. The AE1 board converts between the internal SigmaDelta audio format and G.711 PCM. The AE1 board also has 7 RS232 ports, which can be transported in E1/T1 channels using a proprietary adaptation protocol. Finally the AE1 board can be configured to do transparent switching of timeslots between the two E1 links. The switching pattern is static only, must be configured using a terminal monitor.

Description

General

The AE1 card provides two independent E1/T1 interfaces. The board can be used in different configurations.

An E1 link provides 32 time-slots of 64 kbit/sec each; one slot is reserved for signalling purposes, 31 time-slots can be used for audio and data (maximum 7 data channels).

A T1 link provides 24 time-slots which can all be used for audio and data (maximum 7 data channels).

The connection to E1/T1 is a balanced 2x2-wire cable with an impedance according to E1/T1 standards. It is possible to set the board for E1 operation with a non-standard 100 Ohm impedance to match CAT5 cabling.

All available transmission and multiplexer equipment on the market with an E1/T1 interface can be used together with the AE1 card. Audio on the E1/T1 links is coded according to G.711 which gives telephony audio quality.

The card has access directly to 32 internal bi-directional audio interfaces on the AlphaCom backplane.

There are 8 RS232 serial data ports; one is reserved for a configuration PC and the other 7 are freely usable. An existing link with some spare time-slots can be passed through the AE1 card; AlphaCom audio and data can then be dropped and inserted from/to the spare time-slots. The card therefore also provides fractional E1/T1 multiplexing capabilities.

Exchange support

The AlphaCom and AlphaCom 80+ exchanges have support for the AE1-cards as follows:

• AlphaNet connectivity: Slots 22 and 23
• Multi-module linking: Slots 22, 23 and 24

The AlphaCom M supports the AE1-card as follows:

• AlphaNet connectivity: Slots 4 and 5
• Multi-module linking: Slots 4, 5 and 6

Towards the backplane of the exchange, the AE1-card interfaces to 32 bi-directional Sigma-Delta audio channels.

When used for AlphaNet connectivity, the AE1-card must be located in the master module (device 65); for multi-module use, an AE1 card must be present in each module. AE1 Installation and Commissioning Manual A100K10292/1.0 7

E1 and T1 description

E1/T1 are point-to-point, synchronous links.

• E1 has a speed of 2.048 Mbit/sec, which is divided into 32 timeslots of 64 kbit/sec each. Timeslot 0 is reserved for synchronisation, which means that 31 time slots are available for transmission of information. E1 has a 4-wire balanced interface (separate pairs for transmit and receive), with a 120 Ohm impedance.
  • There is also a specification for a 75 Ohm unbalanced interface. The AE1-card does not support this interface, but 3rd-party equipment exists for matching between these 2 different interface specifications.
  • The AE1-card can be set into a non-standard E1Cat5 mode, for use with 100 Ohm CAT5 cabling.

• T1 has a nominal speed of 1.536 Mbit/sec, which is divided into 24 timeslots of 64 kbit/sec each. In T1 there is no reserved timeslot for synchronisation; synchronisation is achieved by the addition of 1 bit to each 192-bit frame. This makes the real speed of the link 1.544 Mbit/sec. T1 has a 4-wire balanced interface (separate pairs for transmit and receive), with a 100 Ohm impedance.

Installation

The AE1-card is intended to be used for AlphaNet and multi-module linking of exchanges. The card can be used both for the audio and data transfer. The audio is taken directly from the backplane of the exchange. The data links are the same as normally used for data connections between exchanges and are to the serial ports available at the back of an exchanges, either on the Serial Port Connection Board (SPCB) in AlphaCom and AlphaCom 80+ exchanges, or directly on the backplane of the AlphaCom M. These serial ports need to be linked to serial ports on the AE1-card itself, after which the data can be transported over the E1/T1 links.

APC

The APC (in AlphaCom and AlphaCom 80+ exchanges) generates the clock signals for all cards inside the exchange. When an AE1-card is present, this clock will be synchronised to a clock signal on the AE1-card. On the APC, this synchronisation is only possible if the potentiometer related to the clock frequency is not in an extreme position (totally clockwise or anti-clockwise). In case of doubt, put the related potentiometer in the middle position.

[Details on synchronisation in the AlphaCom M exchange]

AlphaCom and AlphaCom 80+

In the AlphaCom and AlphaCom 80+ exchanges, AE1-cards can be placed in the following card position:

• Positions 22 and 23 for use in AlphaNet configuration. Cards for this use can only be placed in the master module of a multi-module exchange.
• Positions 22, 23 and 24 for use in multi-module linking. In this case AE1-cards must be present in the same card positions in all modules to be linked. Normally only card position 24 will be used for this purpose.

For the AlphaCom and AlphaCom 80+ there is a special filter card FBE1 with ordernr 1009509000. This card has a micro ribbon connector and 2 RJ45 connectors. The RJ45 connectors are industry standard 4-wire connection points for the E1/T1 interfaces. The micro ribbon connector gives access to all serial ports on the AE1-card.

The filter card is delivered with an ‘Octopus’-cable on which the console and 3 general purpose serial ports are terminated. One of these connectors is female and can be connected directly (or via a 1-to-1 serial cable, such as the cable for AlphaPro) to the 9-way serial port of a PC. The other 3 connectors are male and can be plugged directly into RS232 serial ports on the SPCB. These 3 connectors are labelled SP #1, SP #2 and SP #3, which refer to these three serial ports on the AE1-card. If more serial port connections are required to the AE1-card, a custom cable must be made.

Connections

The connections on the RJ45 connectors follows the industry standard for E1/T1 and is the same on both connectors:

• Tx+: 4
• Tx-: 5
• Rx+: 1
• Rx-: 2
• GND: 3, 6 and shield (normally this GND connection is not made, as E1/T1 is a 4-wire link and UTP cable can be used for E1 and T1 connections; these GND points are the same and connected together on the FBE1-card itself)

The pin assignment on the female console connector SP C is:

• Tx: 2
• Rx: 3
• Gnd: 5

The pin assignment on the 3 male serial port connectors SP #1, SP #2, SP #3 is:

• Tx: 3
• Rx: 2
• Gnd: 5

The pin assignment of the micro ribbon connector on the filter card is:

	Tx	Rx	Gnd
SP C	2	1	20
SP #1	4	3	22
SP #2	6	5	24
SP #3	8	7	26
SP #4	10	9	28
SP #5	12	11	30
SP #6	14	13	32
SP #7	16	15	34

E1/T1 cable

For direct back-to-back connections between AE1-cards a crossed cable terminated at both ends with 8-pole RJ45 connectors is required. The interconnections between the connectors is as follows:

• Rx+: 1 ↔ Tx+: 4
• Rx-: 2 ↔ Tx-: 5
• Tx+: 4 ↔ Rx+: 1
• Tx-: 5 ↔ Rx-: 2

Note: There are circumstances that a straight cable is required. This is when the cable plugging into the exchange is only a section of the total wiring between exchanges. In this case there should only be one section which is crossed. Note: An E1/T1 cable is not the same as a 10base-T Ethernet cable. Such an Ethernet cable uses different poles in the RJ45 connector.

AlphaCom M

In the AlphaCom M exchange, AE1-cards can be placed in the following card position:

• Positions 4 and 5 for use in AlphaNet configuration. Cards for this use can only be placed in the master module of a multi-module exchange.
• Positions 4, 5 and 6 for use in multi-module linking. In this case AE1-cards must be present in the same card positions in all modules to be linked. Normally only card position 6 will be used for this purpose.

The AlphaCom M screw terminal field provides access to both E1/T1 interfaces and the serial ports.

The AE1-card can only be used with AlphaCom M exchanges with backplane version 2.00. This backplane supports AE1-card related filtering and clock synchronisation. In addition, this backplane version features an additional RCO connector related to ASLT card position 2 (6 extra RCO’s), as well as 4 more RS232 serial ports (AMC serial ports 4, 5, 6 and 7).

On these additional serial ports, the pin assignment is (see also Figure 4):

• Tx: pin 1
• Rx: pin 2
• GND: pin 3

Connections

Connections are made to the screw terminals related to the position in which the AE1-card is situated (position 4, 5 or 6; connectors 19-24, 25-30 or 31-36).

• E1/T1 link #1: Tx+: a19 (25, 31), Tx-: b19 (25, 31), Rx+: c19 (25, 31), Rx-: d19 (25, 31)
• E1/T1 link #2: Tx+: a20 (26, 32), Tx-: b20 (26, 32), Rx+: c20 (26, 32), Rx-: d20 (26, 32)
• Console RS232 serial port, SP C: Tx: a21 (27, 33), Rx: b21 (27, 33)
• Serial Port #1, SP #1: Tx: c21 (27, 33), Rx: d21 (27, 33)
• Serial Port #2, SP #2: Tx: a22 (28, 34), Rx: b22 (28, 34)
• Serial Port #3, SP #3: Tx: c22 (28, 34), Rx: d22 (28, 34)
• Serial Port #4, SP #4: Tx: a23 (29, 35), Rx: b23 (29, 35)
• Serial Port #5, SP #5: Tx: c23 (29, 35), Rx: d23 (29, 35)
• Serial Port #6, SP #6: Tx: a24 (30, 36), Rx: b24 (30, 36)
• Serial Port #7, SP #7: Tx: c24 (30, 36), Rx: d24 (30, 36)
• For GND return for external equipment connected to the serial ports, use the ’-‘ connection of the 24V DC OUT screw terminal.

Wiring examples

The wiring required at the AlphaCom M is best illustrated by an example:

• AlphaCom M node 1 with an AE1-card in card slot 4
• AlphaCom M node 2 with an AE1-card in card slot 5
• AlphaNet connection between the nodes, using line interface #1 at node 1 and line interface #2 at node 2
• At node 1, AMC serial port 1 is used for the AlphaNet data link
• At node 2, AMC serial port 4 is used for the AlphaNet data link
• At both nodes, AE1-card serial port 1 is used for the AlphaNet data link

The following connections are needed:

• The E1/T1 link:
  • Node 1: connector 19 ‘a’ (Tx+) 􀃅􀃆 Node 2: connector 26 ‘c’ (Rx+)
  • Node 1: connector 19 ‘b’ (Tx-) 􀃅􀃆 Node 2: connector 26 ‘d’ (Rx-)
  • Node 1: connector 19 ‘c’ (Rx+) 􀃅􀃆 Node 2: connector 26 ‘a’ (Tx+)
  • Node 1: connector 19 ‘d’ (Rx-) 􀃅􀃆 Node 2: connector 26 ‘b’ (Tx-)
• Serial data connection at Node 1:
  • Connector 21 ‘a’ (Tx) 􀃅􀃆 AMC serial port 1 pin 3 (Rx)
  • Connector 21 ‘b’ (Rx) 􀃅􀃆 AMC serial port 1 pin 2 (Tx)
• Serial data connection at Node 2:
  • Connector 27 ‘a’ (Tx) 􀃅􀃆 AMC serial port 4 pin 2 (Rx)
  • Connector 27 ‘b’ (Rx) 􀃅􀃆 AMC serial port 4 pin 1 (Tx)

AlphaCom M: Upgrade of already installed exchanges

AlphaCom M exchanges delivered prior to or around the time of the first release of the AE1-card (September 2003) cannot be used with the AE1-card, due to the fact that the previous version of the AlphaCom M backplane has no support for this card.

The AlphaCom M backplane has been upgraded to provide the possibility of clock synchronisation, without which the AE1-card will not work.

It is possible to upgrade an existing system by replacing the backplane with a new version. The order number for a new backplane is: A100C07815.0200.

The procedure for changing the backplane is as follows:

• Switch off the power.
• Remove all cards from the exchange, including the power module.
• Remove all connections to the backplane.
• Loosen the fastening of the backplane and remove the backplane.
• Place the new backplane on the back of the exchange and fasten. Do not fasten the screws too tightly at this stage.
• Carefully place some of the cards back into the exchange, making certain that the cards mate with the backplane connectors correctly. As the backplane should not be fastened tightly yet, it is possible to align backplane and cards correctly.
• Tighten the backplane screws.
• Replace all cards and the power module, if they are not in the exchange yet.
• Re-connect all cabling.
• Switch-on the power.

An easy way to see the difference between the previous and new version of the backplane, is the fact that the new backplane has an additional connector for RCO’s (2 instead of 1), and connectors for 4 additional serial ports.

AlphaNet

AlphaNet requires audio and data links between exchanges.

The audio connections are directly made on the backplane of the exchange. This does not require any special installation.

For the data connections, the AE1-card provides 7 general purpose RS232 serial ports. Data on these ports can be routed on any available E1/T1 time slot. These serial ports can be used for the data links between exchanges by wiring such a port to the required port on the Serial Port Connection Board (SPCB), which is a standard item in an AlphaCom or AlphaCom 80+ exchange.

Ports 1, 2, 4, 5, 6 and 7 on this SPCB provide RS232 interfaces. In an AlphaCom M, the serial ports connectors on the backplane (port1 and port 2) can be used directly. Only 2 wires, Tx and Rx need to be connected, as the GND return path is provided inside the exchange. On the SPCB and the AlphaCom M backplane connectors, Tx is pin 2, Rx is pin 3. In both cases, the serial ports are actually on the AMC-card inside the exchange.

As a standard the ‘Octopus’-cable has 3 serial port connection cables.

Multi-module

A multi-module configuration requires audio rings and data links between the different modules. In E1-mode the AE1-card can provide a maximum of 31 audio rings between modules. This is the case if the E1 connection is only used for the audio rings and the data connections are directly between the SPCB’s of the different modules.

In case that also the data is routed via the E1-links, 30 or 29 audio rings can be provided, depending on the number of modules to be linked. In this case the appropriate AE1-serial ports are connected to the SPCB in the same module.

There is a pre-programmed configuration for the AE1-card, which requires the following connections between the modules:

• E1 link #2 module 65 <--> E1 link #1 module 66 (required for 2 modules)
• E1 link #2 module 66 <--> E1 link #1 module 67 (required in addition for 3 modules)
• E1 link #2 module 67 <--> E1 link #1 module 68 (required in addition for 4 modules)

The pre-programmed configurations for the AE1-card where data is also routed via the E1/T1 link(s) require the following connections between the serial ports:

Module 65	AMC port2<- → AE1port3
Module 66 AMC port0<- →AE1 port1	AMC port1<- →AE1 port2	AMC port2<- →AE1 port3
Module 67		AMC port0<-	→AE1 port1
Module 68			AMC port0<-	→AE1 port1

Serial ports, other uses

The serial ports on the AE1-card are for general purpose use. Any equipment with an RS232 serial data port can be connected to the card, and the serial data can then be transferred across the E1/T1 link. The serial ports support 9600 and 38400 baud as data rate, with 8 data bits, 1 stop bit and no parity.

Status indicators

The AE1-card has 5 leds on the front, giving an indication of the status of the card and the lines. The top led indicates the card status, the other leds are related to the line interfaces.

Card-status indicator

The card status indicator is a multi-colour led:

• Green light - Board is OK and ready for use
• Green blinking light - Board is OK, some of its local audio channels are in use
• Yellow light - Board is initialising
• Red light - Board has reset signal set, or the board is malfunctioning
• No light - Board has no power or no system clock
• Blinking pattern, Dark - red - green - yellow, each cycle is one second: AE1 is in Boot Loader Mode
• Blinking pattern, Green (1.7s) - red (0.3s): Error, APC fails to synchronise to enabled reference clock (refck), see paragraph 4.1.1
  • More than one AE1 in the same card cage with active reference clock (refck)
  • Calibration potentiometer on APC or AC M maybe in an extreme position, set to middle
  • APC or AC M backplane may need servicing

Line interface indicator

There are 2 status leds for each line, which makes 4 in total:

• The top 2 line status leds are for E1/T1 line #1
• The bottom line status leds are for line #2

The top led of each pair is red, the other led is green.

• Green light - Link is OK
• Red light - Link is malfunctioning, signal cannot be decoded at all
  • Missing signal, or wrong configuration, for instance one end of the link is set to E1 while the other end is set to T1
• Green and Red both steady - Basic decoding of signal works
  • Probably wrong configuration of link, e.g. doubleframe vs. multiframe
  • Remote alarm received from peer end, which will happen if the communication works in one direction (if the connection is directly to another AE1-card, the indication at the peer end will be red)
• Green steady, irregular flickering of Red - Basic decoding of signal works
  • Probably bad signal quality due to noise or an incorrect signal level
• Green steady, steady blinking of Red - Basic decoding of signal works
  • Frame slips on received data due to different speed of data, one blink for each frame slip
  • Incorrect configuration (‘refck’ command)
  • APC refck synchronisation does not work (less likely, and this will also be indicated on Board Status led)

The above means that the red led of an unused interface will always be on.

Quick test of the E1/T1 links

It is possible to connect the 2 E1/T1 interfaces on the same board back-to-back. When they communicate correctly, for both interfaces the green led will be on, and the red led will be off. No special programming is required for this test, other then to make certain that both interfaces are set to the same settings, see paragraph 4.1. This can be used to do a test on the interfaces themselves if there is any difficulty in connecting to either external equipment or an AE1-card in another exchange or module.

Note that it can take up to 30 seconds for an E1/T1 link to synchronise. This is normal. During this time the red leds will be on.

Line length

The default settings in the ‘tli mode’ command and the optional parameters given in paragraph 4.1.2 support a line length of 1 kilometre in ‘longhaul’ mode, depending on the cable used. The cable specifications are:

• E1 mode: 120 Ohm/24AWG (0.5mm)
• T1 mode: 100 Ohm/24AWG (0.5mm)
• E1Cat5 mode: CAT5 cable, which is 100 Ohm/24AWG (0.5mm)
• T1 mode: used with CAT5 cable

In case of difficulties of linking exchanges back-to-back using the appropriate cable and adhering to the maximum cable length, please contact our customer support department.

Note: The AE1-card and filter board have insufficient protection against lightning. The cable should not run outside buildings. The card is not tested against specification K.41.

Third party equiment

The AE1-card is intended both for back-to-back connection and connection to third party equipment. Third party equipment can for instance be an ATM-network on which a full or fractional E1/T1 link can be transported, if need be worldwide. In fact any network which provides an E1 or T1 connection point can be utilised to link AlphaNet nodes or modules in multi module exchanges.

The maximum E1/T1 line length is 1 km. In case that AE1-cards need to be linked together across larger distances, and a transport network is not available, the card can be connected to HDSL, fibre optic or other modems with an E1 or T1 interface. The distance that can be bridged with such equipment depends on a number of factors. However a distance of 80 km can be reached without repeaters using high quality mono-mode optical fibres and an appropriate light source wavelength. Note the following points:

• Any echo cancellation in the equipment/network should be turned off
• Serial data timeslots need to be transparent since the protocol used between nodes or modules is proprietary
• Bandwidth compression of audio timeslots is OK as long as the sound level dynamics of the sound is not impaired too much (it is impossible to quantify this statement, and this kind of compression is not recommended)

Programming

Programming of an AlphaCom system with AE1-cards requires programming both of the AE1-card(s) and AlphaPro.

AE1-card programming

The card can operate in different modes. In addition, multiplexing between the different sources/destinations must be set up. For this a number of commands are available, which can be entered in ASCII format. Connect a terminal, or PC running for instance the Microsoft ‘HyperTerminal’ program, to the console serial port. The settings are 8 data bits, 1 stop bit, no parity, 9600 baud, with Xon/Xoff flow control. The command interpreter is always active. If the command prompt is not visible on the screen, just press the ‘Enter’-key once, or reset the AE1-card.

Important note: After reset the AE1-card always uses the configuration as stored in its flash-memory. The only way of writing to that memory is by using the [save’-command].

Synchronisation

An important point for proper operation is the synchronisation of the links. An E1/T1 link is a synchronous link. Timing between the different links is very important. All synchronisation of all links in a complete system must be able to be traced back to the same source.

In case that an AE1-card is connected to an external network, it will normally be the network which provides the synchronisation, as such networks normally have other equipment connected to them as well. It is not acceptable that connected equipment forces its synchronisation on to the network, and any other equipment connected to it. Normally a network provides a very stable and accurate clock signal.

In the AlphaCom exchange and the AE1-card, synchronisation works as follows:

• In the receive direction, synchronisation is always to the received data.
  • The received data is clocked in on a clock regenerated from this received data itself. This means that if the data is sent from a network with an accurate clock, the regenerated clock is just as accurate.
• In the transmit direction, transmission is always synchronised to the APC clock, which itself is synchronised to another source.
  • If there are a number of AE1 cards in the exchange, all links have therefore exactly the same transmit timing
• The AE1-card can provide the synchronisation for the APC clock.
  • When the AE1-card is connected to external equipment with a stable and accurate clock, the regenerated receive clock should be used to also synchronise the APC clock. In that case the transmitted signal from the AE1-card will be just as accurate and stable as the network clock and the signal can then be connected to that network without experiencing loss of data and audio noise due to bad synchronisation.

The command to set the APC-clock synchronisation is refck; the format, with parameters, is as follows:

• refck tl1 – uses the clock signal derived from received data on E1/T1 interface #1
• refck tl2 – uses the clock signal derived from received data on E1/T1 interface #2
• refck master – if there is no stable clock from an external source available, the AE1-card has an accurate crystal which can be used to synchronise the APC clock (use this when for instance 2 exchanges are connected back-to-back)
• refck off – if there are multiple AE1-cards present in a module, only 1 of the cards should provide the synchronisation towards the APC clock, the other AE1-cards must have this possibility turned off; refck off is the default setting

Example: When 2 exchanges are connected back-to-back in an AlphaNet configuration and there is a direct connection between the AE1-cards, use the command refck master for the AE1-card in one of the exchanges, while the command refck tl1 is used for the card in the other exchange (assuming that the card is linked via interface #1). The exchange with the card in master mode will provide an accurate clock in the transmit direction. The other exchange will be synchronised to this same stable clock, and therefore will use this same clock for its transmissions. In effect, the APC-clocks of the 2 exchanges will have the exact same timing.

There is one additional parameter, which is status. This can be used if the status leds give an indication that something is not correct, see paragraph 3.7.

• refck status – a message will be displayed with information about which of the possible sources that the AE1-card has is actually synchronising the APC-card and whether this synchronisation is working correctly

E1/T1 interface modes

The command to set the mode of the E1/T1 interfaces is tli mode (sets the mode of both interfaces to the same), tli 1 mode (sets the mode of interface #1) or tli 2 mode (sets the mode of interface #2).

The first parameter behind the command sets the mode, and can be:

• e1
• t1
• e1cat5 – E1 is a 4-wire connection with a 120 Ohm impedance. When the interface is in e1cat5 mode, the impedance is set to 100 Ohm, which matches the impedance of Cat5 cabling.

Additional parameters are normally not required. The default settings and options for E1 are:

• HDB3 coding
• multiframe (CRC4 multiframe)

• shorthaul (maximum distance 200 m)
• E1 optional parameters
  • doubleframe (alternative framing)
  • autoframe (accepts both multiframe and doubleframe; this should be used if the framing is likely to be changed often, but it will affect the line status monitoring)
  • longhaul (use for distances up to 1 km)
  • tlpb (when an external heavy duty trunk line protection card is used)

The default settings and options for T1 are:

• B8ZS coding
• ESF, with alternative names F24 and CRC6
• shorthaul (maximum distance 200 m)
• T1 optional parameters
  • F4 (alternative framing)
  • F72, with alternative name SLC96 (alternative framing)
  • F12, with alternative names D4 and D3 (alternative framing)
  • longhaul (use for distances up to 1 km)
  • tlpb (when an external heavy duty trunk line protection card is used)

Normally the mode of both interfaces on an AE1-card will be the same, in which case the tli mode command can be used. It is however possible that one of the interfaces is connected to an E1-network, while the other interface (for instance #2) is directly connected to the AE1-card in another exchange via CAT5 cabling. In that case the following commands will set the mode correctly for such use:

• tli 1 mode e1
• tli 2 mode e1cat5

Multiplexing

The AE1-card has built-in multiplexer capabilities. This means that audio and data from the AlphaCom exchange can be assigned to any available E1/T1 timeslot. It is also possible to multiplex timeslots between the two E1/T1 interfaces.

The possible sources and destinations on the AE1-card are as follows:

• There are 7 general purpose serial ports, referred to as S1-S7
• E1 link #1 has 31 accessible timeslots, referred to as A1-A31 (A1-A24 in T1 mode)
• E1 link #2 has 31 accessible timeslots, referred to as B1-B31 (B1-B24 in T1 mode)
• There is access to 32 audio timeslots on the backplane (L1-L32)

Connections between the following sources/destinations are allowed:

• Link1 ↔ Link2
• Link1 ↔ Backplane audio
• Link2 ↔ Backplane audio
• Link1 ↔ Serial ports
• Link2 ↔ Serial ports

The command to be used is switch. Both bi-directional as uni-directional switch commands are allowed, where uni-directional switch-commands are generally only used in multi-module configurations. Some examples are (note that the use of a space character ‘ ’ in front of and behind the operators <, > and <> is mandatory):

switch A1 <> L1 – put the contents of backplane audio interface L1 into the first timeslot of E1/T1 interface #1 AND put the contents of the first timeslot of E1/T1 interface #1 into the backplane audio interface L1

• switch A3 > B7 – put the contents of the 3rd timeslot of E1/T1 interface #1 into the 7th timeslot of E1/T1 interface #2
• switch B7 < A3 – this command has the same effect as the command above

When connecting to other multiplexers care must be taken not to use timeslots which are already in use on the link (for instance, in E1 links, time-slot 16 is very often used for D-channel data links).

Pattern commands

As the AE1-card is intended to be used in AlphaNet and multi-module configurations, there are some pre-defined set-ups which can be used. The command for this is pattern with a parameter. The effect of using the ‘pattern’ command with a parameter is that multiple ‘switch’-commands are pre-loaded.

For multi-module configurations the parameters are:

Serial data	Module #	2 modules	3 modules	4 modules
On E1/T1 links	65	master	master	master
On E1/T1 links	66	slave-last	Slavel-3mod	slavel-4mod
On E1/T1 links	67		Slave-last	slave2-4mod
On E1/T1 links	68			slave-last
Separate	65	master- nodata	master- nodata	master- nodata
Separate	66	slave- last- nodata	slave- middle- nodata	slave- middle- nodata
Separate	67		Slave- last- nodata	slave- middle- nodata
Separate	68			slave-last- nodata

External references

Design docs