The ASM, Access Switch Module subrack is designed to connect subscriberswith narrowband service. The subrack contains the AU line access boards andcommon boards for switching, control and line maintenance.
The COA/BFD 518 007 system product covers all equipped product variantsBFD 518 007/XXX based on the unequipped subrack 2/BFE 518 007.
Up to 540 PSTN lines can be connected to one ASM subrack.
2 IMPLEMENTATION
2.1 General
The ASM can be fitted with narrowband line cards. An Access Unit for PSTN isgenerally referred to as AU-PSTN and an ISDN/BA Access Unit is referred toas AU-BA.
AUs for PSTN or ISDN/BA can be mixed in the same subrack.
The ASM subrack can be equipped with up to 18 AU boards. If the subrack isequipped with a TAU2 board, 17 AU boards is the upper limit.
Slot No.1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Figure 1 ASM PSTN Configuration
AU
S-C
2
16
AU
S2
AU
AU
AU
AU
AU
AU
AU
AU
AU
AU
AU
AU AU
AU
AU
AU
AU
AU
or
TAU
2
TAU
-C2
17 18 19 20 21
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2.2 Included Parts
An equipped ASM subrack is assembled from the following parts:
Product name: Product number
ASM unequipped subrack 2/BFD 518 007AUS2 ROJ 208 215/1AUS-C2 ROJ 208 216/1AUP42, 30 line PSTN with 2x400 Ω current feed ROJ 208 217/1AUBA43, 15 line ISDN/BA ROJ 208 232/1TAU-C2 ROJ 208 218/1TAU2 ROJ 208 219/1Dummy unit, 20 mm cover plate 039/BFY 113 0401/1Dummy unit, 100 mm cover plate 039/BFY 113 2001/1
More information about individual PIUs can be found in the 1551- document foreach PIU.
2.3 Subrack
The main parts of an unequipped ASM subrack are the card cage and thebackplane.
All timeslot speech and AU-V5.1 control communication between the AUS2switch and the AU boards takes place in the subrack backplane in E1 frames.
O&M communication between the AXE host and the TAU2 is transferredbetween the AUS2 switch and the TAU2 board in the subrack backplane in anE1 frame. From the TAU2, the test and administration communication takesplace in the buses (ACOM and LCOM) connecting the TAU2, TAU-C2, AUS-C2and the AU boards in the backplane.
-48 V DC power, subscriber line feeding voltages (VB1 and VB2), ring signal(RG) and PRM signal are distributed in the backplane to all relevant slots fromthe TAU-C2 board.
The backplane is also prepared for Ethernet communication between theboards with the hub located at the AUS2 board.
2.4 ET port disposition at AUS2
AUS2 has 28 ET ports configured as E1s. They are arranged as in Table 1.
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Table 1 AUS2 ET port disposition
AUS2 ETport number
Connected to: Notes
0 EMRP-ring
1 EMRP-ring Accessible at AUS2 front
2 Mesh network for connection to other AUSs
3 Mesh network
4 Mesh network
5 AU no 1 At slot (=UNITPOS) no 3
6 AU no 2 At slot (=UNITPOS) no 4
7 AU no 3 At slot (=UNITPOS) no 5
8 AU no 4 At slot (=UNITPOS) no 6
9 AU no 5 At slot (=UNITPOS) no 7
10 AU no 6 At slot (=UNITPOS) no 8
11 AU no 7 At slot (=UNITPOS) no 9
12 AU no 8 At slot (=UNITPOS) no 10
13 AU no 9 At slot (=UNITPOS) no 11
14 AU no 10 At slot (=UNITPOS) no 12
15 AU no 11 At slot (=UNITPOS) no 13
16 AU no 12 At slot (=UNITPOS) no 14
17 AU no 13 At slot (=UNITPOS) no 15
18 AU no 14 At slot (=UNITPOS) no 16
19 AU no 15 At slot (=UNITPOS) no 17
20 AU no 16 At slot (=UNITPOS) no 18
21 AU no 17 At slot (=UNITPOS) no 19
22 AU no 18 At slot (=UNITPOS) no 20
23 AXE host port no 5
24 AXE host port no 4 Accessible at AUS-C2 front
25 AXE host port no 3 for connection to AXE host
26 AXE host port no 2 or PRA/external V5
27 AXE host port no 1
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2.5 Boards
2.5.1 AUS2, ACCESS UNIT SWITCH (ROJ 208 215/1)
The AUS2 handles the concentration and multiplexing part of the access nodeunder control of AXE central software.
The AUS2 include a switch matrix (TS), a tone sender, a DTMF KeysetReceiver (KR), clock synchronization and AXE control functions such as STRand EMRP functionality (EMRPI).
The AUS2 has 28 ET circuits. They are allocated for 18 links to the AU boards,5 links for the AUS2 communication between subracks and 5 links forconnection to the AXE host. See also Table 1. Some of those 5 links to the AXEhost can alternatively be designated as ISDN/PRA accesses.
2.5.2 AUS-C2, ACCESS UNIT SWITCH CONNECTION BOARD (ROJ 208 216/1)
Interface board for the 5 external E1 links to the AXE host. Both 120 ohmbalanced and 75 ohm unbalanced interfaces are available. External clocksynchronization input (ISI) and synchronized clock output (OSI) are alsoaccessible at the AUS-C2 board.
The interfaces are electrically compliant with ITU-T Rec. G.703.
2.5.3 AUP42, ACCESS UNIT FOR PSTN LINES (ROJ 208 217/1)
The AUP42 is a standard AU board for PSTN that meets the most market needsfor e.g. impedance, current feed, line signalling parameters.
The board contains the ‘normal’ BORSCHT functionality:• Battery feed (2x400 ohm)• Overvoltage protection• Ringing• Supervision (off and on-hook of line)• Codec (analog to digital conversion)• Hybrid (2-4 wire conversion)• Test (of line circuit and line test access)
In addition the AUP42 also has functions for PRM signal sending.
The AUP42 line board includes 30 PSTN line circuits where the traffic andsignalling is multiplexed into one E1 link to the AUS2 board. The speech iscarried on 30 time slots and the AU-V5.1 signalling (line signals and controlprotocol) on the C-channel (T16).
The generators for battery voltages (VB1 and VB2), the ring signal (RG) and thePrivate Meter (PRM) signal are centralized in the subrack and are received overthe backplane from the TAU-C2 board.
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2.5.4 AUBA43, ACCESS UNIT FOR ISDN/BA LINES (ROJ 208 232/1)
The AUBA43 is a standard AU board for ISDN/BA that meets the europeanETSI standards.
The board contains the following functionality:• Line interface with 2B1Q coding• Line power feed (-97V)• Overvoltage protection• Activation/deactivation of the user ports• Test of line circuit and line test access
The AUBA43 line board includes 15 ISDN/BA line circuits where the traffic andsignalling is multiplexed into one E1 link to the AUS2 board. The B channels arecarried on 30 time slots and the AU-V5.1 signalling (D-channel signalling andthe control protocol) on the C-channel (T16).
2.5.5 TAU-C2, TEST AND ADMINISTRATION UNIT CONNECTION BOARD(ROJ 208 218/1)
The TAU-C2 board is the interface board in the ASM subrack for test andadministration functions controlled by the a TAU2 board. The TAU2 board doesnot need to be placed in the same subrack.
The TAU-C2 board also handles the power filtering and distribution of -48V toall other boards in the subrack. It also generates and distributes the two batteryvoltages (VB1 and VB2) for line feeding, the ring signal (RG) and the PrivateMeter (PRM) signal to the AU boards.
The MIA fault indicators at each board front in the ASM subrack are driven fromthe TAU-C2 board, but controlled from a TAU2 board (Master TAU2) using theLCOM interface. Each TAU-C2 board can drive up to 21 LEDs within itssubrack.
External alarm collection and fan control is also a part of the TAU-C2 functions.
2.5.6 TAU2, TEST ADMINISTRATION AND MAINTENANCE UNIT (ROJ 208 219/1)
The TAU2 handles all remote maintenance test functions and administration/configuration of the node.
The line testing and line circuit testing circuitry at the TAU2 board can beconnected over the test bus to any AU board in the node for line and line circuittesting.
The TAU2 includes functions for transferring configuration data and softwareupgrades for the AU boards. It also collects the HW inventory data and controlsthe visible MIA fault indicators at the boards in the node.
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3 INTERFACES
3.1 Internal interwork in the ASM Subrack
All internal interwork connections are carried out in the ASM subrackbackplane.
Figure 2 ASM interconnections
Pow
-48V
TA Bus
-48V/VB/+5V
ACOM/LCOM
Pulsi
LED control
TA bus
Pow
er -
48V
/VB
/+5V
TA B
us
AC
OM
/ LC
OM
(R
S48
5)
ASM backplane
E1-Links ext.
TAU2
+5V
Pulsi
ACOM / LCOM
Subscriber
Ext. ALARM out
Ext. ALARM in
Power -48V
RG/PRM
RG
/PR
M
AUS-C2
E1/
OS
I/IS
I
-48V/VB
TA Bus
ACOM
Eth
erne
t*)
AU
RG/PRM
E1
Ethernet*)
-48V/VB
TA Bus
ACOMAU
RG/PRM
E1
Ethernet*)
-48V/VB
TA Bus
ACOMAU
RG/PRM
E1
Ethernet*)
AUS2
Ethernet*)
E1/OSI/ISI
LCOM
-48V
E1/OSI/ISI
Ethernet*)
Ethernet*)
E1
Ethernet*)ACOM/LCOM/TA
Fan powerand alarm
Ext. TA
(to all slots)
*) Prepared for future introduction
TAU-C2
E1-Links int.
OSI/ISI
E1 Monitor
V.24/TWR
I2C, +3,3V*)
I2C/+3,3V*)
2Mb/s synch
2Mb/s synch
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3.1.1 Power distribution
Table 2 shows the power supply structure within the ASM subrack.
The subrack is power supplied by -48V DC connected to the TAU-C2 boardfront. After filtering at the TAU-C2, the -48V is distributed in the backplane to allother board positions (Slot no 1-20).
At the TAU-C2, two voltages VB1 and VB2 are generated from the incoming-48V for distribution in the backplane to the AU boards to be used for subscriberline feeding.
+5V is distributed in the backplane from the TAU-C2 board to the AUS-C2board at slot position 1. This voltage is used to supply the AUS-C2 HW identityand board position reading logic.
For future use, if an I2C bus is introduced between AUS2 and AUS-C2, thebackplane is prepared for supplying the AUS-C2 board from the AUS2 boardwith +3,3V instead of the present +5V supply from the TAU-C2 board.
There are 28 E1 ports at the AUS2 board. 18 of them (AUS2 port no. 5-22) arerouted in the backplane in a star configuration to each AU board position. 5 E1(AUS2 port no. 23-27) are connected in the backplane from the AUS2 to theAUS-C2 board for AXE host connection or ISDN/PRA accesses.
Voltage Originatingat slot
Destinationsat slot(s)
-48V 21 1-20
VB1 (-52V) 21 3-20
VB2 (-37V) 21 3-20
+5V 21 1
+3,3V 2 1
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For external synchronization, the OSI and ISI interfaces to the AUS2 are routedin the backplane to the AUS-C2 board to be accessible at the front of this board.
3.1.3 Ring-Generator (RG) and PRM
The Ring-Generator and the PRM generator are centralized at the TAU-C2board. These analogue signals, together with their synchronization signals, arerouted in the backplane to all AU board positions.
3.1.4 O&M Communication buses
3.1.4.1 General
There are one ACOM and one LCOM bus in the ASM backplane. The busesare available at all board positions but not used by all boards.
Via the TAU-C2 board, the buses are connected with cables to the othersubracks in a node. This makes it possible for one TAU2 to control andsupervise boards in other subracks within a node.
The buses are serial according to the RS-485 standard.
3.1.4.2 ACOM
The ACOM bus is the communication link between the TAU2 and the AUboards.
3.1.4.3 LCOM
The LCOM bus is the communication link between the TAU2 and the AUS-C2and the TAU-C2 boards.
3.1.5 Test access bus
This is the analogue test access connection. The buses connects themeasurement equipment on the TAU2 or external test equipment with the AUboards.
The test access bus consists of a Line Test Access (LTA) pair and a Circuit TestAccess (CTA) pair. The bus is routed in the backplane from the TAU-C2position and is available at all AU slot positions in the subrack.
Via the TAU-C2 board, the bus is connected with cables to the other subracksin the node. This makes it possible for one TAU2 to control and supervise alsoboards in other subracks.
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3.1.6 PULSI
A synchronous interface called PULSI is handling the test access bus relays atthe TAU-C2 board in an ASM subrack equipped with a TAU2 board. The TAU2is the PULSI interface master and controls relays at the TAU-C2 to makerequested test access bus connections.
3.1.7 Failure / Service Indications
The failure/service indication LEDs (MIA) placed on each plug in units areconnected in the backplane with a star structure from the TAU-C2. The controlof the LED function is done by the TAU2 which sends the LED information overthe LCOM bus to the TAU-C2 units in each subrack.
3.1.8 Ethernet and I2C interfaces
For future use, each board in the ASM subrack can be connected to an Ethernetnetwork. An Ethernet switch/hub is proposed to be placed at the AUS2. Eachboard position will be given access in the backplane to this Ethernet switch. TheEthernet can in future rationalization steps replace the internal communicationbetween boards that today is done over the ACOM and LCOM buses.
For future communication between AUS2 and AUS-C2, an I2C interface isprepared for in the ASM backplane to be used if the LCOM bus is removed fromthe system.
3.1.9 Addressing
3.1.9.1 Subrack ID (SUBID)
The 4 bit subrack address (SUBID) in a MACCG is set with a DIP switch in thebackplane. This information is available at all board positions in the backplane.
Note 1 - Some boards may only decode the three least significant bits of theSUBID thus limiting the number of subracks in a node to 8.
Note 2 - Backplane definitions:• Logical “0”: Signal pin connected to ground• Logical “1”: Signal pin not connected
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3.1.9.2 Board position (UNITPOS)
The board slot address (UNITPOS) is hard wired in the backplane and is using5 bits. The first (leftmost) board position has slot number 1 (00001) and the lastboard slot has number 21 (10101).
Note - Backplane definitions:• Logical “0”: Signal pin not connected• Logical “1”: Signal pin connected to ground
3.1.9.3 EMCOD
The 4 bit EM address information (EMCOD) for the EMRPI function on theAUS2 is obtained from the SUBID address in the backplane.
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3.2 External Interfaces
3.2.1 General
All external interfaces to the ASM subrack are realized by cables connected tothe board fronts. See Figure 3.
3.2.2 Power supply
The ASM is supplied with -48V. Single power feeding is used. The powerdistribution cable is terminated at the TAU-C2 board front.
Required fuse value is 15A for each ASM subrack.
Figure 3 Board front connectors
AUS-C2 AUS2
To ASM n+1
To ASM n-1
ISI/OSI
E1 #5 to host
E1 #4 to host
E1 #3 to host
E1 #1 to host
E1 #2 to host
V.24/Debug(Typewriter)
Monitor
EAUS-C2
MIA
EAUS2
RUN
COM
SYN
CSR
TL1
TL2
EAUP42
MIA
ETAU2
MIA
ETAU-C2
AUP42 TAU2 TAU-C2
Subscriber lines
V.24/TAU test
MIA
LEDtest
To ASM n+1
To ASM n-1
To fan
Power in
External alarms in
External alarms out
External test access
1
E1INT
2
3
4
TEST
MON
FAN
TA
LINE
SYNC
5
48V
ALO
ALI
MIA
POW
TEST
E1EXT
COM&TESTBUS
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3.2.3 Fan
One fan unit can be power supplied with -48V from the ASM subrack by a cableconnected to the TAU-C2 board front. This interface also handles alarms fromthe fan unit.
3.2.4 External E1s
5 E1 (AUS2 port no. 23-27) for connection to the AXE host are available at theAUS-C2 board front to be connected to the DDF. Both 75 ohm unbalanced and120 ohm balanced interfaces are available according to ITU-T Rec. G.703.
If the subrack handles the STR-STC control link to the AXE host, this link iscarried in timeslot 16 within external E1 number 1 (AUS2 port 27).
Some of the five E1s can alternatively be used as ISDN/PRA or external V5accesses.
3.2.5 OSI/ISI (External synch)
An external (input and output) synch interface according to ITU-T Rec. G.703 isavailable at the AUS-C2 board front.
The ISI input is intended for incoming 2048 kHz external synchronization signalto be used as an alternative synchronization source for the node instead ofsynchronizing to one of the E1 from the AXE host.
The OSI output delivers a 2048 kHz synchronized clock signal to be used byother equipment at the site or equipment downstream in the network (e.g. PBX)that needs a clock signal locked to the AXE host clock.
3.2.6 Monitor
The MONITOR output located at the AUS-C2 board front can be used tomonitor one or more of the 5 external E1s at the AUS-C2 board for maintenancepurposes.
3.2.7 Node internal E1s and node synchronization
Interconnection of the AUSs between ASM subracks in the same node for theEMRP-ring, the mesh-network and synchronization (SYNC-ring) is performedby front cabling at the AUS2 board. 5 E1s (AUS2 port no. 0-4) and the SYNC-ring signals are included in this network.
3.2.8 Subscriber lines to MDF
From the MDF, the subscriber lines are connected with cables to the ASMsubrack at the AU boards with 30 lines to each board for the PSTN case. ForISDN/BA, 15 lines are connected to each AU board.
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3.2.9 Subscriber lines to DDF
PRA or external V5 subscriber links, see 3.2.4.
3.2.10 O&M buses
Interconnection of the ACOM and LCOM buses and the test access busesbetween ASM subracks in the same node is performed by front cabling at theTAU-C2 board.
3.2.11 External test access
For connection of external test equipment (test head) for line and line circuitmeasurements, a connector is available at the TAU-C2 board front.
3.2.12 External alarms
8 external alarm inputs are available at the TAU-C2 board front for e.g. powerbattery failure, burglar and/or fire alarms.
The TAU-C2 board is also hardware prepared for future introduction of 4 alarmoutputs.
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4 CHARACTERISTICS
4.1 Mechanical Design
Mechanical Design Type BFD 518 in the BYB 501 Family.
The ASM subrack has 21 board slots.
Figure 4 Physical dimensions of a ASM subrack
4.2 Cabinets
The ASM subrack is intended for BYB 501 (both 300 mm and 400 mm depth)or BYB 502 cabinets. By use of suitable mounting brackets, it may be mountedin 19 inch racks or cabinets or in ETS 300 119-3 cabinets like BYB 311. It canalso be mounted in outdoor cabinets.
When not mounted in BYB 501 or BYB 502, thermal and other properties haveto be verified to ensure reliable operation.
4.3 Weight
Depending on configuration, an ASM weighs up to 23 kg.
Depending on number of E1 connections to the AXE host, PSTN traffic can beoffered up to 0,25 E/line or for ISDN/BA up to 0,25 E/B-channel.
Other factors, like special AU boards with high power dissipation due to highline current feeding characteristics in combination with high ambienttemperature, can also limit the allowed traffic capacity.
4.4.2 PSTN and PRA
With lower requirement on PSTN traffic capacity, the ASM subrack can beconfigured to offer both PSTN and ISDN/PRA traffic.
4.5 Power Consumption
The values in Table 3 for the power dissipation of the specific boards areprovided as a guideline. For accurate dimensioning of the node power supply,please refer to the information in PRIM for the particular BFE product.
Table 3 Board typical power consumption and dissipation
The ASM subrack power consumption and dissipation for different traffic casesbased on the figures in Table 3 are shown in Table 4 and Table 5 below.
Board Board dissipation Board consumption
AUS2 10 W 10 W
AUS-C2 3 W 3 W
AUP42 idle 5,7 W +1,01 W/active line
idle 5,7 W +1,76 W/active line
AUBA43 9,8 W (normal power mode)10,8 W (restricted power
mode)
20,5 W (normal power mode)32,6 W (restricted power
mode)
TAU-C2 idle 6,0 W +0,19 W/active PSTN line
idle 6,0 W +0,19 W/active PSTN line
TAU2 11 W 11 W
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Table 4 Power consumption and dissipation for fully equipped subrack,540 lines PSTN with 2x400 ohm current feed
Note - Calculations are based on a line length distribution with an average line loopresistance of 250 ohm.
Table 5 Power consumption and dissipation for fully equipped subrack,270 lines ISDN/BA
Note 1 - Calculations are based on a line length distribution with an average line loopresistance of 250 ohm.Note 2 - Figures for normal line power mode shall be used for -48V power supplydimensioning. (When restricted line power mode occurs, it is likely that the powerfeeding for the ASM is taken from battery backup)Note 3 - All 270 lines are supposed to be in the same line power mode
4.6 Environmental Compliance
Tests have verified compliance with radiated and conducted emission part ofEN 300386 V.1.3.1. for location in other than Telcom center (Class B), for PSTNonly configuration. Mixed PSTN/ISDN-BA configurations fulfil requirements forTelecom Centre (Class A).
Declaration of Conformity covers Telecom Center (Class A).
Product safety fulfills EN 60950:2000.
4.7 Climatic Conditions in Operation
ETS 300 019-1-3 class 3.1 with upper temperature range extended to +50˚C.
Traffic PowerConsumption
PowerDissipation
0,00 E 120 W 120 W
0,10 E 230 W 190 W
0,15 E 280 W 220 W
0,20 E 330 W 250 W
0,25 E 380 W 280 W
Line powermode
PowerConsumption
PowerDissipation
Normal 390 W 200 W
Restricted 610 W 210 W
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4.8 Environmental Conditions
Transportation: ETS 300 019-1-2 Class 2.3.Storage: ETS 300 019-1-1 Class 1.1.
4.9 Resistibility to Overvoltages and Overcurrents
Overvoltage test comply with ITU-T K.20 (02/00), enhanced level.
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5 GLOSSARY
ACOM Communication bus (RS485) between TAU2 and AUASM Access Switch ModuleAU Access UnitAUS Access Unit SwitchAUS-C AUS ConnectionBA Basic AccessCTA Circuit Test AccessDDF Digital Distribution FrameDTMF Dual Tone MultiFrequencyEMC ElectroMagnetic CompatibilityEMRP Extension Module Regional ProcessorEMRPI Extension Module Regional Processor, IntegratedET Exchange TerminalHW HardWareI2C Inter-Integrated Circuit (bus originally specified by Philips)ISI Incoming Synchronisation InterfaceISDN Integrated Services Digital NetworkKR Keyset ReceiverLCOM Communication bus (RS485) for special purposesLED Light Emitting DiodeLTA Line Test AccessMACCG Multiple Access GroupMDF Main Distribution FrameMIA Maintenance Interrupt AlarmOSI Outgoing Synchronisation InterfacePIU Plug-in UnitPRA Primary Rate AccessPRM Private meterPSTN Public Services Telephony NetworkRG Ring GeneratorSTC Signalling Terminal CentralSTR Signalling Terminal RegionalSUBID Subrack Identity (set by a DIP switch in the backplane)TA Test AccessTAU Test and Administration UnitTAU-C TAU ConnectionTS Time SwitchTWR TypeWRiterUNITPOS Unit PositionVB Subscriber line feed voltage (=”Battery” voltage)
