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3. DXX 8170 CLUSTER NODE 3.1 Introduction
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DXX MANAGED ACCESS SYSTEM
DXX 8100 NODE TECHNICAL DESCRIPTION
DXX 8170 CLUSTER NODE DESCRIPTION
Introduction
ERICSSON AB
3/1551-ZAE 901 17 Uen Rev G
2003-11-05
3. DXX 8170 CLUSTER NODE
3.1 Introduction
DXX 8170 cluster node is the largest node in the DXX 8100 system. DXX 8170 cluster node consists of
one DXX 8170 cluster master subrack and of up to eight DXX 8170 cluster slave subracks. An example
of DXX 8170 cluster node with eight slave subracks is shown in Fig. 1 and the block diagram in Fig. 2.
The maximum cross-connect capacity of DXX 8170 cluster node is 512 Mbit/s (8 x 64 Mbit/s or
256 x 2 Mbit/s). The cross-connection granularity is the 64 kbit/s time slot and its four signalling bits.
The following interface units are available in the DXX 8170 cluster slave subrack: AIU, CEU, E3C, FBU,
FRU, GMH, GMM, GMU-A, OMH, QMH and VMM.
Other characteristics of DXX 8170 cluster node are the same as in DXX 8150 basic node.
Fig. 1: Example of DXX 8170 Cluster Node
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SLAVE 1
SLAVE 3
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MASTER 2 of 60
DXX MANAGED ACCESS SYSTEM
DXX 8100 NODE TECHNICAL DESCRIPTION
DXX 8170 CLUSTER NODE DESCRIPTION
Introduction
ERICSSON AB
3/1551-ZAE 901 17 Uen Rev G
2003-11-05
Fig. 2: DXX 8170 Cluster Node Block Diagram
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DXX MANAGED ACCESS SYSTEM
DXX 8100 NODE TECHNICAL DESCRIPTION
DXX 8170 CLUSTER NODE DESCRIPTION
General
ERICSSON AB
3/1551-ZAE 901 17 Uen Rev G
2003-11-05
3.2 General
3.2.1 Master Subrack of DXX 8170 Cluster Node
The control and cross-connect part of DXX 8170 cluster node resides in the master subrack.
The DXX 8170 cluster node master subrack consists of the following units:
The RXS-CD subrack mechanics is similar to that of DXX 8150 basic node but the mother boards and
the bus extender cards are different.
The PFU fuse units are the same as in DXX 8150 basic node. The battery power can be protected in each
shelf but only when the first fuse unit is PFU-A.
The DXX 8170 cluster node control unit CCU is responsible for node communication and control.
The DXX 8170 cluster node cross-connect unit CXU-M controls matrix operation and provides node
timing. CXU-M units can have 1+1 redundancy.
The DXX 8170 cluster node cross-connect unit CXU-A cross-connects 64 kbit/s signals. One CXU-A is
needed in the master subrack for each slave subrack. CXU-A units can have 1+1 redundancy.
The DXX 8170 cluster node signalling cross-connect unit CXU-S provides cross-connection for channel
associated signalling (CAS) 0.5 kbit/s signals for voice channels. CXU-S units can have 1+1 redundancy.
Cluster Master Subrack Units When n x Slave Subracks Are Used
Unit Type
Unit Name
Protected Configuration
(a)
(a) Cross-connection protected
RXS-CD
Subrack
1 pc
PFU-A
Fuse unit
2 pcs
PFU-B
Fuse unit (battery protection)
2 pcs
CCU
DXX 8170 cluster node control unit
1 pc
CXU-M
DXX 8170 cluster node cross-connect unit/master
1 + 1 pcs
CXU-A
DXX 8170 cluster node cross-connect unit/slave
n + n
(b)
(b) n = number of slave subracks
CXU-S
DXX 8170 cluster node signalling cross-connect unit
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DXX MANAGED ACCESS SYSTEM
DXX 8100 NODE TECHNICAL DESCRIPTION
DXX 8170 CLUSTER NODE DESCRIPTION
General
ERICSSON AB
3/1551-ZAE 901 17 Uen Rev G
2003-11-05
Fig. 3: Master Subrack of DXX 8170 Cluster Node
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DXX 8100 NODE TECHNICAL DESCRIPTION
DXX 8170 CLUSTER NODE DESCRIPTION
General
ERICSSON AB
3/1551-ZAE 901 17 Uen Rev G
2003-11-05
3.2.2 Slave Subracks of DXX 8170 Cluster Node
The DXX 8170 cluster node slave subrack is basically the same as DXX 8150 basic node and can have
single or double shelves, see Fig. 4. The SXU-A/B unit must be replaced by the SXU-C unit.
SXU-C adapts the 64 Mbit/s X-bus to the DXX 8170 cluster node master subrack, and for this purpose
SXU-C includes an inter-subrack module. SXU-C generates X-bus timing signals. The cross-connected
signals always pass through the DXX 8170 cluster node master subrack even when the two cross-
connected ports reside in the same slave subrack.
Fig. 4: Single Shelf Slave Subrack of DXX 8170 Cluster Node
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SXU-C
RESERVED FOR INTERFACE UNITS
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DXX MANAGED ACCESS SYSTEM
DXX 8100 NODE TECHNICAL DESCRIPTION
DXX 8170 CLUSTER NODE DESCRIPTION
General
ERICSSON AB
3/1551-ZAE 901 17 Uen Rev G
2003-11-05
3.2.3 Cross-Connect Switch of DXX 8170 Cluster Node
The CXU-M unit controls the cross-connect units CXU-As which are interconnected by the cluster cross-
connect bus (CX-bus) within the master subrack.
The cross-connect switch (not duplicated) in maximumcapacity consists of: one CXU-M unit for the control of the cross-connection one CXU-A unit for each slave subrack one CXU-S unit for the cross-connection of signalling bits (XD-channel)
The DXX 8170 cluster node clock is generated in the CXU-M unit. Any incoming clock in any slave
subrack can be selected as a reference. A fallback list with five elements can be configured as in DXX
8150 basic node. In later CXU-M versions a holdover feature is provided. A station clock (external clock)
interface is realized on CXU-M.
Protected Cross-Connect
The cross-connect matrix of DXX 8170 cluster node is normally duplicated so that each part resides on a
separate shelf. All control and X-buses are also duplicated. SXU-C units in the slave subracks must then
also be duplicated.
The two cross-connect matrices operate independently. The protected DXX 8170 cluster node has only
one CCU control unit which controls the switch-over. The DXX 8170 cluster node operation is constantly
supervised at the background with test signals, and if a defect is detected, the signal is automatically
switched through the protecting part. The change-over is done by the SXU-C units. 7 of 60
DXX MANAGED ACCESS SYSTEM
DXX 8100 NODE TECHNICAL DESCRIPTION
DXX 8170 CLUSTER NODE DESCRIPTION
DXX 8170 Cluster Node Cross-Connection
ERICSSON AB
3/1551-ZAE 901 17 Uen Rev G
2003-11-05
3.3 DXX 8170 Cluster Node Cross-Connection
DXX 8170 cluster node consists of one DXX 8170 cluster main subrack and of up to eight DXX 8170
cluster slave subracks (DXX 8150 basic subracks) linked via intersubrack cables. Cross-connections are
realized by the main subrack which contains a cross-connect matrix consisting of several units. The main
subrack cannot contain user access units.
The subracks of DXX 8170 cluster node are placed in adjacent racks. DXX 8170 cluster node with eight
slave subracks typically occupies three racks.
3.3.1 Node Capacity
DXX 8170 cluster node can accommodate 256 of 2048 kbit/s ports or 64 of 8448 kbit/s ports (total
capacity is 512 Mbit/s). N x 64 kbit/s signals with possible channel associated signalling can be cross-
connected. A strictly non-blocking time space matrix is implemented.
3.3.2 Main Subrack Cross-Connect Units
The cross-connect matrix consists of up to eight DXX 8170 cluster cross-connect units CXU-As, one
CXU-S signalling cross-connect unit (optional) and one CXU-M master cross-connect unit. In protected
use the matrix is doubled for redundancy.
CXU-A cross-connects n x 64 kbit/s signals. CXU-A links to a slave subrack by an intersubrack cable.
CXU-S cross-connects n x 0.5 kbit/s signals multiplexed by the multiframe. CXU-S is common for the
eight slave subracks. It has no external interface to the slave subracks.
DXX 8170 cluster cross-connect unit CXU-M supervises the operation of CXU-As and CXU-S and
supplies bus timing in the main subrack. CXU-M receives cross-connection commands and maintains the
cross-connect memories of CXU-A/CXU-S.
3.3.3 Slave Subrack Cross-Connect Unit
The DXX 8150 basic subrack hardware is adapted for the DXX 8170 cluster operation by replacing the
cross-connect unit SXU-A/B with the SXU-C cross-connect unit (see SXU description). The SXU-C unit
is similar to the SXU-A but provided with an intersubrack interface module and a program memory for
the DXX 8170 cluster operation. The SXU-C does not do actual cross-connection, it only transfers signals
to/from the main subrack. 8 of 60
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DXX 8100 NODE TECHNICAL DESCRIP