OptiX OSN 7500 Intelligent Optical Switching System. Technical Manual - part 2
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（B）:Standby
Figure 2-1 Access capacity of service slots of the OptiX OSN 7500
2.1.3 High Integration Design
The dimensions of the OptiX OSN 7500 subrack are 757 mm (H) x 497 mm (W) x 295
mm (D). A single subrack has 22 slots for processing boards and 8 slots for interface
boards. One 2.2 m-high and 300 mm-deep European Telecommunications Standards
Institute (ETSI) cabinet can accommodate two OptiX OSN 7500 subracks at most.
2-3
2.2.1 SDH/PDH Service
The OptiX OSN 7500 can access SDH and PDH services, such as:
Standard SDH: STM-1/4/16/64
Standard SDH concatenated payload: STM-4c/16c/64c
SDH with FEC: 10.71 Gbit/s, 2.66 Gbit/s
Standard PDH: E1/DS1, E3/DS3, E4
2.2.2 Ethernet Services
The OptiX OSN 7500 provides EFS4, EFS0, EGS2, EGT2 and EFT8 Ethernet boards
to satisfy the requirements of different Ethernet services transmission.
FE electrical Ethernet service
FE optical Ethernet service
GE optical Ethernet service
2.2.3 ATM Services
The OptiX OSN 7500 provides four different ATM processing boards: ADL4, ADQ1,
IDL4 and IDQ1. The IDL4 and the IDQ1 support inverse multiplexing for ATM (IMA).
The ADL4/IDL4 provides one STM-4 interface, using a hot swappable LC optical
module, which can be S-4.1 and L-4.1.
The ADQ1/IDQ1 provides four STM-1 interfaces, using a hot swappable LC optical
module, which can be I-1, S-1.1 and L-1.1.
2.2.4 SAN and Video Services
The OptiX OSN 7500 provides the multi-service transparent transmission processing
board MST4, to access fiber channel (FC), fiber connection (FICON), enterprise
systems connection (ESCON), digital video broadcast-asynchronous serial interface
(DVB-ASI) and GE services and fulfills their transparent transmission. The MST4
performs the following functions.
Provides four independent multi-service access ports.
Supports FC services (FC50, FC100/FICON and FC200) from four ports with a
total bandwidth of not more than 2.5 Gbit/s, and supports transmission of FC
services at full rate, that is, supports 1 x FC200 or 2 x FC100 or 4 x FC50.
2-4
and FC200 supports1500 km.
Ports 1 and 2 support distance extension at client side: FC100 supports 40 km, and
FC200 supports 20 km.
Supports ESCON or DVB-ASI service from four ports.
All services are encapsulated in GFP-T mode compliant with ITU-T G.7041. The
services are mapped into VC-4, VC-4-Xc or VC-4-Xv.
2.2.5 Built-in WDM Technology
The OptiX OSN 7500 provides dual optical add/drop multiplex board MR2A/MR2C
and arbitrary rate wavelength conversion board LWX to realize built-in WDM
technology. Below are their characteristics.
The MR2A/MR2C can add or drop any two adjacent standard wavelengths (with
spacing being 100 GHz) in compliance with ITU-T Recommendation G.694.1. The
operating wavelength range is 1535.82 nm-1560.61 nm.
The MR2A/MR2C can be used as an OTM to add/drop two wavelengths and
concatenation of two MR2A/MR2Cs can function as an OTM to add/drop four
wavelengths.
The MR2A/MR2C can work with the LWX to function as an OADM to add/drop two
wavelengths.
The LWX supports the conversion between client signaling wavelength and ITU-T
G.692 compliant standard wavelength and supports transparent transmission of
signals.
Provide 3R function to added/dropped client signals (10 Mbit/s-2.7 Gbit/s),
implement clock recovery and monitor the transmission rate.
Provide two types of LWX board, one is single-fed single receiving and the other is
dual-fed selective receiving.
The dual-fed selective receiving LWX board supports intra-board protection with
protection switching time less than 50ms.
The single-fed single receiving LWX board supports 1+1 inter-board protection with
protection switching time less than 50ms.
2.2.6 Service Access Capability
The capacity of services that the OptiX OSN 7500 can access varies with the type and
quantity of the configured boards. Table 2-2 lists the maximum capacity of the OptiX
OSN 7500 for accessing different services.
2-5
Service type
Max. access ports of a single subrack
STM-64 standard or concatenated service
18
STM-64 (FEC) service
18
STM-16 standard or concatenated service
80
STM-16 (FEC) service
18
STM-4 standard or concatenated service
88
STM-1 standard service
280
STM-1 (electrical) service
64
E4 service
16
E3/DS3 service
24
E1/T1 service
252
Fast Ethernet (FE) service
168
Gigabit Ethernet (GE) service
44
STM-1 ATM service
88
STM-4 ATM service
22
ESCON/FC50 service
88
FICON/FC100 service
44
FC200 service
22
DVB-ASI service
88
2.3 Interface
2.3.1 Service Interface
The OptiX OSN 7500 provides service interfaces. Table 2-3 lists description of these
service interfaces.
2-6
Interface type
Description
SDH
STM-1 electrical interface
STM-1 optical interfaces: I-1, S-1.1, L-1.1, L-1.2, Ve-1.2
STM-4 optical interfaces: I-4, S-4.1, L-4.1, L-4.2, Ve-4.2
STM-16 optical interfaces: I-16, S-16.1, L-16.1, L-16.2, L-16.2Je,
V-16.2Je, U-16.2Je
STM-16 optical interfaces (FEC): Ue16.2c, Ue16.2d
STM-64 optical interfaces: I-64.1, S-64.2b, L-64.2b, Le-64.2, Ls-64.2,
V-64.2b
STM-64 optical interfaces (FEC): Ue64.2c, Ue64.2d
The STM-16 and STM-64 optical interfaces support fixed wavelength
output compliant with ITU-T G.692: 192.1THz - 196.0THz
PDH
E1, DS1, E3, DS3, E4 electrical interfaces
Ethernet
10/100Base-TX, 100Base-FX, 1000Base-SX, 1000Base-LX,
1000Base-ZX
ATM
STM-1 optical interfaces: I-1, S-1.1, L-1.1
STM-4 optical interfaces: S-4.1, L-4.1
E3 interface
IMA E1 interface
SAN
FC50, FC100/FICON, FC200, ESCON service optical interfaces
Video
DVB-ASI service optical interface
2.3.2 Administration Interface
The OptiX OSN 7500 also provides administration interfaces. See Table 2-4 for
description of these administration interfaces.
Table 2-4 Administration interfaces provided by the OptiX OSN 7500
Interface
Description
Clock interface
Two 75 ohm external clock interfaces (2048 kbit/s or 2048 kHz)
Two 120 ohm external clock interfaces (2048 kbit/s or 2048 kHz)
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Description
Alarm interface
Sixteen Boolean input interfaces, four Boolean output interfaces
Concatenated input interface for Boolean alarm
Four output interfaces for cabinet alarm indicator
Four concatenated input interfaces for cabinet alarm indicator
Administration
One RS-232 data circuit-terminal equipment (DCE) remote
interface
maintenance interface, which can be accessed by Modem(X.25)
Four auxiliary data interfaces for transparent transmission of serial
data, with a maximum rate of 19.2 kbit/s (S1-S4)
One 64 kbit/s codirectional data path interface (F1)
One RJ45/100Base-T network management (NM) interface (ETH)
One administration serial interface (F&f)
Orderwire
One orderwire phone interface (PHONE)
interface
Two SDH network node interface (NNI) voice interfaces (V1-V2)
Two SDH network node interface (NNI) signaling interfaces
(multiplexed with two data interfaces for transparent transmission of
serial asynchronous data)
2.4 Intelligent Features
Note:
The intelligent software system can be bundled with or seperated from the OptiX OSN
7500 as required. If not equipped with the intelligent software system, the OptiX OSN
7500 will not support the intelligent features described in this manual.
The OptiX OSN 7500 provides a set of stand-alone intelligent software system that is
quite convenient and flexible in use in dynamic bandwidth allocation, intelligent service
routing and configuration of services. The bandwidth utilization is improved.
The intelligent features help the OptiX OSN 7500 to:
Support automatic end-to-end service configuration.
Support service level agreement (SLA).
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Provide traffic engineering control to guarantee load-balance traffic networkwide
and improve the bandwidth availability.
Provide distributed mesh network protection including real-time rerouting and
preconfiguration. Support span protection and end-to-end service protection,
improving the scalability of the network.
2.5 Networking
The OptiX OSN 7500 is a multiple add/drop multiplexer (MADM) system. It can
process up to 160 embedded control channels (ECC). It supports complicated
network topologies at STM-1/STM-4/STM-16/STM-64 level, such as chain, ring, hub,
ring with chain, tangent rings and intersecting rings, as shown in Table 2-5.
Table 2-5 Basic networking modes for the OptiX OSN 7500
Networking mode
Topology map
1
Chain
2
Ring
3
Tangent rings
4
Intersect-ing rings
2-9
Topology map
5
Ring with chain
6
DNI
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Hub
8
Mesh
MADM
ADM
Legend:
TM
2.6 Resilient Packet Ring
The resilient packet ring (RPR) is suitable for ring topology and able to restore
services from broken fiber and link failure. Its major features are:
Providing the topology automatic discovery function to reflect the network status in
real time.
Supporting fair algorithm by configurable weight and supporting three service
levels.
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at the destination node.
Solving fairness and congestion control problems.
Providing RPR protection.
2.7 Protection
2.7.1 Equipment Level Protection
Table 2-6 shows the equipment level protection provided by the OptiX OSN 7500.
Table 2-6 Equipment level protection provided by the OptiX OSN 7500
Item
Protection scheme
E1/T1 processing board
1:N (N≤4) tributary protection switching (TPS)
E3/DS3/E4/STM-1(e) processing
1:N (N≤3) TPS
board
Ethernet processing board
1:1 TPS
ATM/IMA processing board
1+1 backup
Cross-connect & timing unit
1+1 backup
SCC unit
1+1 backup
–48 V power interface board
1+1 backup
3.3 V board power supply
1:N centralized backup
Note:
The OptiX OSN 7500 supports the coexistence of two TPS protection groups of different
types.
2.7.2 Network Level Protection
In terms of network level protection, the OptiX OSN 7500 supports four-fiber/two-fiber
multiplex section protection (MSP) ring, linear MSP, shared optical path virtual trail
protection and sub-network connection protection (SNCP).
The four-fiber/two-fiber MSP ring can be constructed for STM-64, STM-16, STM-4
and STM-1 services for protection. Table 2-7 shows the maximum number of MSP
rings supported by the OptiX OSN 7500. At one time, the OptiX OSN 7500 only
supports one protection scheme in the following table.
2-11
Protection scheme
Max. number of MSP rings
STM-64 four-fiber MSP ring
4
STM-64 two-fiber MSP ring
8
STM-16 four-fiber MSP ring
20
STM-16 two-fiber MSP ring
40
2. Adjustable MS Bandwidth
In terms of MSP, the OptiX OSN 7500 supports bandwidth adjustment by VC-4, that is,
for an STM-64 ring, its MS bandwidth can change from one VC-4 to 32 VC-4s.
3. Four Sets of MS K Bytes
For the STM-64 optical interface, the OptiX OSN 7500 can process four sets of MS K
bytes simultaneously. Up to four MS rings can be constructed through an STM-64
optical interface.
4. Suppression Function in MS
The OptiX OSN 7500 can suppress misconnected VC-4 services. In the MSP ring,
each protection timeslot is shared by different segments or occupied by extra traffic.
When there is no extra traffic within the ring, if a certain node is segregated due to
failure of multiple nodes, the traffic of different segments that occupies the same
timeslot may contend for the timeslot and result in misconnection of traffic. When there
is extra traffic transmitted over the protection path, even in the case of failure of a
single node, the traffic of the working path may contend for the timeslot on the
protection path that carry extra traffic and result in misconnection.
To prevent misconnection, a detailed connection table is created for each node of the
OptiX OSN 7500. Each node knows the source point and destination point of each
AU-4. Then through APS commands, the node can detect probable misconnection in
advance, and discard the probably misconnected traffic by inserting the AU-AIS
alarm.
2.8 DCN Communication
To support intelligent features, the OptiX OSN 7500 demands a large capacity of
bandwidth for management purpose. Traditional DCC channels (D1-D12) fail to
provide enough bandwidth to transmit intelligent signaling. However, the OptiX OSN
7500 extends the DCC channels to a bandwidth of 2 Mbit/s or 2.8 Mbit/s by flexibly
combining DCC bytes in a STM-N signal.
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Hardware
This chapter describes the hardware structure of the OptiX OSN 7500, including the
outer view and parameters of the cabinet, and structure of the subrack. It covers:
Outer view and parameters of the cabinet
Subrack structure
3.1 Cabinet
The OptiX OSN 7500 can be installed in the ETSI cabinet. Table 3-1 shows the
technical parameters of the ETSI cabinet. Figure 3-1 shows the outer view of the ETSI
cabinet.
Table 3-1 Technical parameters of the ETSI cabinett
Size (mm)
Weight (kg)
Number of configured subracks
600 (W) x 300 (D) x 2000 (H)
60
1
600 (W) x 600 (D) x 2000 (H)
64
1
600 (W) x 300 (D) x 2200 (H)
70.4
2
600 (W) x 600 (D) x 2200 (H)
101
2
600 (W) x 300 (D) x 2600 (H)
80
2
600 (W) x 600 (D) x 2600 (H)
112.3
2
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