JPH088553B2 - Method and apparatus for a flexible multiplexer - Google Patents

Description

The present invention relates to methods and apparatus for flexible multiplexers.

Flexible multiplexers allow arbitrary grouping and distribution of time slots of digital multiplexed signals. The flexible multiplexer can form the connection between the connection units on the subscriber side,
Furthermore, grouping and separation between the subscriber-side connection unit and the line-side connection unit and channel distribution between the line-side connection units can be performed.

This type of multiplexer device is published in the publication "PDMX-Prog
rammierbarer Digitalmultiplexer fuer die 2-Mbit / s
−Netz−ebene ”, Siemens AG, Bereich Uebertra−gungss
ysteme, Postfach 700073, Beste11-Nr.A42020-S154-
A1-2-29 and U.S. Pat. No. A-4725835.

In the case of the connection of a significantly large number of connection units, which should be able to be completely feed-through to one another, the problem arises in the installation of a correspondingly large number of speech / data and signaling multiplexed signal lines. In earlier proposal (Europe) patent application No. 891080590, 07/11/90, all subscriber-side connection units and line-side connection units are no longer led to their respective multiplex signal lines, The connection unit on the side and the connection unit on the line side are respectively connected to the call / data switch frame via two call / data multiplex signal lines for both transmission directions, and also for the two transmission directions. When connected to the signaling switch frame via one signaling multiplex signal line, the multiplex signal line is reduced.

For example, 64 Kbit / S for one time slot allocation
A signal or a signal having a bit rate that is a multiple thereof is assigned. In the latter case, multiple bytes per frame are cross-connected through the switch frame. In this case, if these bits arrive in two different frames in time at the first output of the switch frame, the Application Note “Memory Time Switch Large”, P
As shown in EB 2047, Siemens AG, 12/89, temporal compensation is performed as follows. Ie at least 1
The byte that originally came in the first frame,
Instead, it is guided back from the second output side of the switch frame to another input side via a loop. This delays this byte in this switch frame by one frame duration, and finally the first of the switch frame.
All bytes on the input side arrive in time into the same subsequent frame. This naturally makes it possible to reduce the number of switching points that are effectively available, since the bytes inserted and transmitted in each loop must pass through another switching point.

The flexible multiplexer is configured for a predetermined number of connection units-having units with a predetermined number of channels contained therein. However, this kind of connection unit can include a different number of channel units. As a result, a large number of connection units are also formed for the multiplexer anyway. However, in this case, the switching network must always be designed to handle the maximum number of channel units.

It is an object of the invention to firstly ensure byte integrity and secondly to increase the number of connection units as required without substantially modifying the basic device.

This problem is solved by the present invention by the configuration described in claim 1. This method and the device for carrying it out are set out in the subclaims.

Select the first bit rate to 64K bits / S or a smaller value, and set the second bit rate to 2048,
4096 or 8192 and 1544, 3088 or 6176 Kbit / s
It is advantageous to select

In this method, as the number of connection units increases, the smaller switch frame is not replaced by the larger switch frame, but the smaller switch frame is complemented by another frame.

Therefore, in this method, the extended switch frame can be accommodated separately from the main switch frame and further used as needed. In addition, the channels can be feed-through, undelayed or delayed as desired. The non-delayed channel has, for example, only 1 byte per frame and the signal to be transmitted through is transmitted in the shortest possible pass time. The delayed channel can be used for nx64 Kbit / S signals for the purpose of ensuring byte integrity. In this case, the number of connection units is small, and additional switching points are used for additional connection possibilities that are not used or available loop circuits.

The basic device is a rack, which is filled with connection units connected to this main switchframe alongside the switchframe. In the case of expansion, an expansion switch frame is also contained in this. On the other hand, the expansion unit is inserted into the second rack for space reasons, from which the connection unit is connected to the expansion switch frame. The loop is attached only to the expansion switch frame. The purpose is to maintain the capacity of the main switch frame, i.e. the number of switching points used for direct feedthroughs. If a switching point for the loop had to be set up in the main switch frame, a smaller number of connection units could be operated and the first rack would be partially empty.

In order to implement this method, only four symmetrical buses are needed for the call / data- and signaling multiplex lines between both racks, and further between adjacent main- and expansion switch frames. Only four asymmetric buses are needed. The latter is advantageous because the plug connector need only have half the number of contacts as in the case of symmetrical buses.

 Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a block diagram of a flexible multiplexer proposed by the prior application. FIG. 2 shows a connection unit on the subscriber side according to the proposal of this earlier application. FIG. 3 shows a line side connection unit proposed by this prior application. FIG. 4 shows a block diagram of a flexible multiplexer according to the present invention. FIG. 5 shows a block diagram of the main and extended switch frames. FIG. 6 shows this main unit with a commercially available integrated circuit.
And an extended switch frame.

FIG. 1 shows a block diagram of a flexible multiplexer proposed by the prior application. The multiplexer comprises subscriber side connection units T7a, 8a, 9, 10 and 11, line side connection units L12, 13 and 14, control 15, call / data main switch frame 16a, signaling main switch frame 17a,
Call / data buses 18a and 19a, signaling bus 2
0a and 21a, multiplexed signal line 22 for voice / data
a, 22d, 23a and 23d, multiplex signal lines for signaling 24a, 24d, 25a and 25d and a control bus 26.
This control bus consists of all subscriber side connection units 7a, 8a, 9,
It is connected to 10 and 11 and all main switch frames 16a and 17a. The symbol S / D means that a speech or data signal can be transmitted in one time slot. The symbol Kz represents a signaling signal.

Before explaining the operation of the device of FIG. 1, the subscriber side connection unit T is introduced in FIG. 2 and the line side connection unit L is introduced in FIG.

FIG. 2 shows a subscriber-side connection unit T having eight channel units K, time / space switching devices 27 and 28 and space / time switching devices 29 and 30.
The channel unit K is connected on the one hand with the time / space switching devices -27 and 28 and on the other hand with the space / space switching device.
Time switching devices 29 and 30 are connected together. This is illustrated by the fact that the terminals represented by the same 3-digit number are connected together. The time / space switching devices-27 and 28 and the space one-time switching devices-29 and 30 are set and adjusted via the control bus 26. A 64 Kbit / S input signal with a bit rate of n is converted into n bytes per frame.

FIG. 3 shows a line side connection unit L having a frame multiplex 31 and a frame demultiplexer 32.
The multiplexer signal is indicated by M. This multiplexer signal can be, for example, a 2048 Kbit / S signal. In the 16th frame of this signal, a 4-bit signaling word each is transmitted for two channels. This signaling word is converted into a signaling word in the byte length format.

In FIG. 1, subscriber connection units T are connected to each group. For example, the subscriber side connection units 7a and 8a and another subscriber side connection unit T not shown are
Make up one group. This group comprises buses 18a-21a, which are led in star fashion from the main switch frames 16a and 17a via four multiplexed lines 22a-25a, respectively.
Connected with. Line-side connection units L are also connected to these buses; line-side connection units 12 are connected, for example, via multiplex signal lines 22d to 25d. The main switch frames 16a and 17a and the buses 18a to 21a are components of the controller CTR. Call / data signal S
An external input side 1 and an external output side 2 are provided for / D. An external input 3 and an external output 4 are provided for the signaling signal Kz. An external input 5 and an external output 6 are provided for the multiplex signal M. Main switch frames 16a and 17a are integrated circuits PEB2
040 or PEB2047, and the connection units T and L further comprise, for example, the integrated circuit PEB2055.

FIG. 4 shows a flexible multiplexer according to the present invention. This multiplexer comprises, in a rack I, the known controller CTR shown in FIG. 1, the subscriber side connection units 7a and 8a, the line side connection units 12 and 13, the control unit 15 and the switching network expansion according to the invention. Includes equipment SNE. Further, in the rack II, the subscriber side connection unit 7b and
Includes 8b and 7c and 8c.

The switching network expansion device SNE is selectively different in size and includes a call / data expansion switch frame 16b and a signaling expansion switch frame 17b, respectively. The buses 18a-21a already shown in FIG. 1 are further asymmetrically routed to the extended switch frames 16b and 17b via the switch frame interfaces 45-48. In addition to this expansion switch frame buses 18b-2
1b is guided inward via symmetrical rack interfaces 35-38. From this interface, multiplex signal lines 22b to 25b and 22c to 25c are led to the subscriber side connection units 7b, 8b and 7c, 8c.
Further, delay bus loops 3 and 34 are connected.

Figure 5 shows the extension switch frame 16b for call / data.
Shows a block diagram of a main switch / frame for call / data 16a having This block diagram likewise applies to the signaling main switch frame 17a with the signaling extension switch frame 17b. Those reference symbols are shown in parentheses.

Multiplex input signal for call / data S / D-EM1 or multiplex input signal for signaling Kz
-The time slot in EM1 is the call / data multiplex output signal S / DAM1 or signaling, multiplex output signal via the call / data switch frame 16a or the signaling main switch frame 17a.
To Kz-AM1 or call / data expansion switch frame 1
6b or signaling extension switch frame 17b via the call / data multiplex output signal S / D-AM2 or
S / D-AM3 or signaling multiplex output signal Kz
-AM2 or Kz-AM3 is switched and connected. The voice / data multiplex input signal S / D-EM2 or the signaling multiplex input signal Kz-EM2 is transmitted via the voice / data extension switch frame 16b or the signaling extension switch frame 17b to the voice / data multiplex output signal S / D. D-AM1 or signaling multiplex signal Kz-AM1 or speech / data multiplex output signal S
/ D-AM2 or S / D-AM3 or signaling multiplex output signal Kz-AM2 or Kz-AM3 is cross-connected. Multiplex output signal S / D-AM3 and Kz-AM3
Of the time slots are delayed by the frame connection time as multiplexed input signals S / D-EM3 to Kz-EM3 via bus loops 33 to 34 which can consist of one or more lines. It is also possible to configure the loop multiple times along the dashed arrow.

FIG. 6 shows a block diagram according to FIG.
The device realized in 7 is shown. Symbol 1 for call / data
6a, 39, 40 and 41 and for signaling the symbols 17a, 42, 43 and 44. The number with an asterisk indicates how many S / D- or Kz-multiplex signal lines each pass in parallel. In this case, the numbers 512 and 1024-the value of the belonging in parentheses-is 6
The possible number of channels on the buses 18a-21a and 18b-21b for 4 Kbit / S signals is shown. Buses 18a-21a of the controller CTR are connected to the switching network SNE via asymmetric switch frame interfaces 45-48.

Claims (2)

[Claims] 1. A flexible multiplex method, in which n (n = 1,2,3, ...) First speech / data input signals (S / D-ES1) of a first bit rate. ) And the first signaling input signal (Kz-ES1) are the first of the second bit rates in the first allocation of the time slot.
To multiplex input signal for call / data (S / D-EM1) and multiplex input signal for signaling (Kz-EM)
1) and further said separate call / data (S / D-EM1) and signaling (Kz-EM1) formed from a mixed voice / data and signaling multiplexed signal (M). ) For the first call / data (S / D-AM1) and the first signaling (Kz) in the second allocation of timeslots.
-AM1) multiplex output signals are cross-connected to each other, and the multiplex output signals for the first speech / data (S / D-AM1) and signaling (Kz-AM1) are n-th. For 1st call / data (S / D-AS1) and signaling (Kz-AS1) of 1 bit rate
For split / mixed calls / output signals for
Data and signaling multiplex signal (M)
In the flexible multiplexing method of the type that can be summarized into the following, n second call / data input signals (S / D-ES2) and second signaling input signals (Kz-ES2) of the first bit rate are expanded. In the first allocation of the time slot, the second call / data multiplex input signal (S / D-EM2) of the second bit rate and the second signaling multiplex input signal (Kz-EM2) are combined. The multiplex input signal for the first call / data (S / D-EM1) and the signaling (Kz-EM1) is transferred to the second time in the second extended time slot allocation.
(S / D-AM2) to third (S / D-AM3) for speech / data and second (Kz-AM2) to third (Kz-AM3) signaling multiplex output signals for switching connection, and The multiplexed input signal for the second call / data (S / D-EM2) and the signaling (Kz-EM2) is used for the first call / data (S / D-AM1) and the signaling in the second extended time slot allocation. (Kz-AM1) multiplex output signal and / or second (S / D-AM)
2) to 3rd (S / D-AM3) for call / data and 2nd
(Kz-AM2) to third (Kz-AM3) signaling multiplex output signals are cross-connected, and further, second speech / data (S / D-AM2) and signaling (Kz-EM2) multiplex The output signal is n first
The bit rate is divided into output signals for the second speech / data (S / D-AS2) and signaling (Kz-AS2), and further for the third speech / data (S / D-AM3) and the third signaling. The (Kz-AM3) multiplex output signal is used for the third call / data (S / D-EM3) and the signaling (Kz-AM3) in the second expansion time slot allocation.
A flexible multiplex method characterized in that the loop is passed once for each time slot to the EM3) multiplexed signal and delayed by one frame duration. 2. A flexible multiplexer for implementing the method according to claim 1, wherein said multiplexer is a first subscriber side connection unit (7a, 8a, 9-1).
1), the connection unit comprises an external call / data input side (1), an external call / data output side (2), an external signaling input side (3), and an external signaling output side (4). A channel unit (K) having a line side connection unit (12-14), the connection unit including an external multiplex signal input side (5) and an external multiplex signal output side (6). And further includes a controller (CTR), the controller including a main switch / frame for call / data (16a), the switch frame including a first multiplex signal line for call / data (22a, 23a; 22d, 23d). First bus consisting of (18a, 19
a) is connected to an external connection unit (7a, 8a, 12, 13), the switch frame further includes a signaling main switch frame (17a), and the switch frame is a first signaling multiplex. It is connected to the connection unit (7a, 8a, 12, 13) via a bus composed of signal lines (24a, 25a; 24d, 25d), and further includes a control device (15), and the control device is one control In the flexible multiplexer of the type in which all the subscriber side connection units (7a, 8a, 9-11) and the main switch frame (16a, 17a) are connected via the bus (26), the second subscriber side A connection unit (7b, 8b; 7c, 8c) is provided, and the connection unit includes an external call / data input side (1), an external call / data output side (2), and an external signaling input side ( 3) and external signaling output (4 Further comprising a channel unit (K) having a voice / data extension switch frame (16b), and the switch frame includes a third voice / data multiplex signal line (22b, 23b; 22c, 23c). ) Is connected to the second subscriber side connection unit (7b, 8b; 7c, 8c) via the third bus (18, 19), and further via the first bus (18a, 19a). It is connected with 1 signal / multiplex signal line (22a, 23a; 22d, 23d) for data,
Further, a signaling extension switch frame (17b) is provided, and the switch frame is provided through a fourth bus (20b, 21b) composed of a fourth signaling multiplex signal line (24b, 25b; 24c, 25c) to a second It is connected to the subscriber side connection unit (7b, 8b; 7c, 8c), and further via the second bus (20a, 21a) to the first signaling multiplex signal line (24a, 25a; 24d, 25d). Connected,
In addition to the call / data extension switch frame (16b) and signaling extension switch frame (17b)
Is provided with a call / data (33) and signaling (34) delay loop between the output side and the input side, and a second subscriber side connection unit (7b, 8b; 7c, 8c)
And the extended switch frame for call / data (16b) and the extended switch frame for signaling (17b)
A flexible multiplexer, which is connected to a control device (15) via a control bus (26).