Huawei OptiX BWS 1600G. Technical Description - part 11
5 Protection
Inter-subrack optical channel protection allows more flexible configuration of
boards. The working OTU and the protection OTU may reside in different
subracks.
On the transmit side, an OLP03 board divides the incoming client signals and feeds
the signals into the working OTU and the protection OTU. Then the two OTUs send
the signals over a working channel and a protection channel respectively, as shown
in Figure 5-6.
Working channel
Protection channel
O
O
Main
Slave
T
T
subrack
subrack
U
U
OLP
Client-side equipment
Figure 5-6 Inter-subrack 1+1 optical channel protection
On the receive side, both the working OTU and the protection OTU receive the
optical signals and send the signals to the OLP03 board. The OLP03 board selects
to receive signals from the working OTU and further sends the signals to client-side
equipment.
Once the working channel is faulty, the working OTU shuts down its client-side
transmitter. Accordingly the OLP03 board switches to receive signals from the
protection OTU. When the working channel recovers, the protection OTU pair can
be restored after the switching. And the OLP03 board switches back to receive
signals from the working OTU, or continues to receive signals from the original
protection OTU according to the pre-configuration.
5-5
5 Protection
Note
If the GE service boards (like LDG, FDG, LOG and LOGS) are configured
with the inter-subrack 1+1 optical channel protection, it is forbidden to enable
Auto-Negotiation for the working boards and protection boards on the
transmit and receive ends.
Channel switching of the OLP03 is according to the optical power of the
channel. Thus make sure that the difference of optical interface power between
the working channel and the protection channel is less than 3 dm.
In the configuration of inter-subrack 1+1 protection, the working OTU,
protection OTU and OLP03 board can be configured in different subracks. The
OLP03 board can still provide protection in case the power of the subrack is off.
Then, the protection OTU and OLP03 board cannot be configured in the same
subrack.
1:N (N ≤ 8) OTU Protection
Key services can be protected by backing up the OTU board, as shown in Figure
5-7.
Working channels
Working channels
λ1
λ1
λ
8
λ8
O
OTU
M
D
OTU
O
C
4
4
C
P
0
0
P
Protection channel
Protection channel
λ9
λ9
OTU
OTU
Figure 5-7 Schematic diagram of 1:N (N≤8) OTU protection
As shown in Figure 5-7, wavelengths λ1 to λ8 are used as working channels while
wavelength λ9 is used as the protection channel. During normal working, the
protection wavelength carries no service. When any OTU with working wavelength
λ1 - λ8 becomes faulty, the service of the faulty OTU is switched to the standby
OTU. That is to say, the traffic will shift to λ9 through the optical switch at the
transmit end, and is further sent to the protected client equipment. If multiple OTUs
are faulty, the system will protect the service with the highest priority level. If two
working channels have the same priority, the channel with a smaller number is to
be switched first.
The advantage is that one dedicated OTU protects the service of N (N≤8) working
OTU boards and switches the service at both the transmit and receive ends. The
APS protocol is used for service switching. Stable switching mechanism ensures
high system performance and saves your investment.
5-6
5 Protection
Note
1. N (N ≤ 8) working OTU boards and one standby OTU form one protection group.
But in such a protection group, each OTU and the OCP board must be plugged in
the same subrack.
2. To realise 1:N (N ≤ 8) OTU protection, it is required to set protection pair on the
NM.
Currently, the OTUs that support 1:N (N ≤ 8) OTU protection include:
LWF/LWFS
LWC1
LBE/LBES
The 1:8 OTU protection is applied in any networking structure.
5.3 Clock Protection
The clock is the heartbeat of any transmission equipment. For smooth system
running, OptiX BWS 1600G system provides equipment/network level protection
for the clock channel. The system supports two different clock protection modes:
one is dual-fed and dual-receiving, and the other is dual-fed signal selection.
In the first protection mode, clock selection is performed by the customer’s external
BITS system. The protection is shown in Figure 5-8.
Working channel
Working channel
1510 nm
1510 nm
Clock
TC
TC
To
FIU
FIU
BITS
TC
TC
1625 nm
1625 nm
Protection channel
Protection channel
Figure 5-8 Schematic diagram of clock channel protection (dual-fed and dual-receiving)
In the second mode, clock selection is made inside the equipment and
single-channel clock is output, as shown in Figure 5-9.
Working channel
Working channel
1510 nm
1510 nm
Clock
TC
TC
FIU
FIU
Clock Output
TC
TC
1625 nm
1625 nm
Protection channel
Protection channel
Figure 5-9 Schematic diagram of clock channel protection (dual-fed signal selection)
5-7
5 Protection
The TC1 (unidirectional optical supervisory channel and timing transporting unit)
is used in the OTM and supports three input/output clocks locally.
The TC2 (bidirectional optical supervisory channel and timing transporting unit)
supports six clocks output locally and three clocks input to the system. It is used in
the OLA, OADM and REG.
To provide 1+1 clock redundancy, two TC1 or TC2 boards are used, working at
1510 nm (active) and 1625 nm (standby). Two TC boards must be plugged in slot 6
and slot 8 on the subrack at the same time (the board in slot 8 is the backup for the
board in slot 6). When only one TC board is used, the clock protection function
cannot be activated.
The transmission of up to 3 clocks in the west direction and 3 clocks in the east
direction is supported.
The clock is protected only from one direction, that is, either from the east direction
or from the west direction.
The clock transmission protection mechanism of the OptiX BWS 1600G system is
discussed below.
(1) The intermediate station does not add/drop clock signals
If there is no intermediate site in bidirectional configuration, the transmission of 3
clock signals in both directions can be supported. However, the system supports
only unidirectional protection of three clock signals. As shown in Figure 5-10, the
networking is the same as the point-to-point clock transmission system.
OTM
OTM
1510 nm
T1
T1
T2
T
T
T2
T3
T3
C
1510 nm
C
T4
T4
T5
1
1
T5
T6
T6
1625 nm
T1
T
T
T2
T3
C
C
1
1
Electrical clock signals from/to the back plane
Clock signals transmitted over optical fiber
Figure 5-10 Configuration of the system with clock protection function but without add/drop
of clock signals at intermediate stations
(2) The intermediate station adds/drops clock signals
If there are clock signals added/dropped in the intermediate stations, the system
supports bidirectional transmission of three clocks. However, the system supports
only unidirectional protection of three clock signals. Figure 5-11 shows the clock
signal configuration at an intermediate station. Figure 5-10 shows the clock signal
5-8
5 Protection
configuration at the terminal station. The terminal station supports the transmission
of up to three clocks in two directions.
T4 T5T6 A B C
1510 nm
1510 nm
T1
D
T2
T
E
T3
C
F
2
1510 nm
1510 nm
1625 nm
1625 nm
T4 T5T6
T1
D
T2
T
E
T3
C
F
2
A B C
Clock signals without prtection (8Mbit/s)
Electrical clock signal from/to backplane
Clock signalswith protection
Figure 5-11 Configuration of the intermediate station with clock protection function and with
the add/drop of clock signals
Note
1. The clock protection switching takes one channel of clock as the switching unit.
2. To realise the clock protection function of the network clock, it is required to set
the clock protection group on the NM.
5-9
5 Protection
5.4 Network Management Channel
5.4.1 Protection of Network Management Information Channel
In DWDM systems, network management information is transmitted over an
optical supervisory channel, which shares the same physical channel with the main
path. It is obvious that, any anomaly or failure on the main path will affect the
supervisory channel. Therefore, a backup supervisory channel must be provided.
In a ring network, when fibre cut occurs in a certain direction, network
management information is automatically switched to the optical supervisory
channel in the other direction of the ring, as shown in Figure 5-12, not affecting the
management of the whole network.
NE A
NE B
Normal supervisory channel
NM
Management information
GNE
Management information
Normal supervisory channel
NE D
NE C
Network cable
Optical fiber
Figure 5-12 Network management protection in ring network (a certain section fails)
With data communication network (DCN), the OptiX BWS 1600G can also
provide network management information channel. The user can choose ways to
use the channel according to the networking and spanning. In point-to-point
networking and chain networking, when both the fiber transmission and the
supervisory channel fail, the network goes unmanageable. This can be avoided by
the network management information channel in DCN mode. The system NE can
provide network management information channel by the DCN.
To set up a DCN network management channel, access the DCN between the two
NEs through a router. With initial configuration, network management information
is transmitted over the normal supervisory channel when the network is normal.
See Figure 5-13.
5-10
5 Protection
GNE
NE
normal supervisory channel
Management information
NM
DCN
Network cable
Router
DCN supervisory channel
Router
Optical fiber
Figure 5-13 Network management through the normal supervisory channel
Upon the failure of the normal supervisory channel, network elements
automatically switch the management information to the DCN supervisory channel
to guarantee the supervisory and operation on the entire network, as illustrated in
Figure 5-14.
GNE
NE
Normal supervisory channel
NM
Management information
DCN
Network cable
Router
DCN supervisory channel
Router
Optical fiber
Figure 5-14 Network management through the DCN supervisory channel
It is important to select different routes for the DCN supervisory channel and
normal channel during network planning. Otherwise the backup function will not
take effective.
5.4.2 Interconnection of Network Management Channel
The OptiX BWS 1600G provides various data interfaces (for example Ethernet
interface) for the interconnection of network management channels among
different DWDM networks, or between a DWDM network and an SDH network,
as shown in Figure 5-15. It enables unified management of different transmission
equipment.
5-11
5 Protection
Network
management
center
ADM
SDH
ADM
ADM
network
Network
management
ADM
Network
channel
management
channel
A
DWDM
B
D
network
ADM
C
Network
SDH
ADM
ADM
management
network
channel
ADM
ADM
ADM
Figure 5-15 Supervision over OptiX transmission network
5-12
6 Technical Specifications
6
Technical Specifications
6.1 Optical Interfaces
The optical interfaces on the client end comply with ITU-T G.957 and G.691.
STM-64 optical interface: I-64.1, I-64.2, S-64.2b, Se-64.2a, Le-64.2
STM-16 optical interface: I-16, S-16.1, L-16.1, L-16.2
STM-4 optical interface: I-4, S-4.1, L-4.2
STM-1 optical interface: I-1, S-1.1, L-1.2
GE: 1000BASE-SX, 1000BASE-LX
10GE: 10G BASE-LR, 10G BASE-ER
ESCON: ANSI X3.230, X3.296
Laser safety: In compliance with ITU-T Recommendation G.664.
Fibre connector: LC/PC, SC/FC, FC/PC, ESH/APC
6.2 Power Supply
Input voltage: -48 V DC or -60 V DC
Voltage range: -38.4 V to -57.6 V DC or -48.0 V to -72.0 V DC
6-1
6 Technical Specifications
6.3 Parameters of Mechanical Structure
Table 6-1 Parameters of cabinet and subrack
Height (mm)
Width (mm)
Depth (mm)
Weight (kg)
T63
Type 1
2200
600
300
69
Cabinet
Type 2
2600
600
300
78
Type 3
1800
600
300
58
Type 4
2000
600
300
64
Subrack
625
495
291
18 (Note 1)
Note 1: It is the weight of an empty subrack with no boards or fan box installed.
6.4 Nominal Power Consumption, Weight and Slots of
Boards
Table 6-2 lists the nominal power consumption, weight, and slots of the boards in
an OptiX BWS 1600G system. The power consumption in the list is the value when
the board works normally in normal temperature (25°C) and high temperature
(55°C).
Table 6-2 Power consumption, weight and slots of boards
Board
Maximum power
Maximum power
Weight
Slots
consumption at 250C (W)
consumption at 550C (W)
(kg)
occupied
E3LWF
27.1
29.8
1.4
1
E2LWF
32.9
36.2
1.6
1
E3LWFS
40.0
44.0
1.4
1
E2LWFS
41.7
45.8
1.7
1
TMX
42.0
46.2
1.8
2
TMXS
46.4
51.0
1.8
2
LWC1
21.5
23.6
1.1
1
LDG
29.5
33.0
1.0
1
FDG
34.5
38.0
1.0
1
LBE
31.6
34.8
1.4
1
LBES
44.3
48.7
1.7
1
LWX
27.0
29.7
1.0
1
6-2
6 Technical Specifications
Board
Maximum power
Maximum power
Weight
Slots
consumption at 250C (W)
consumption at 550C (W)
(kg)
occupied
LWM
27.0
29.7
1.0
1
TMR
22.3
24.5
1.3
1
TMRS
35.0
38.5
1.3
1
TRC1
21.5
23.0
1.0
1
M40 / D40
20.0
22.0
1.6
2
V40
46.0
50.6
2.2
2
MR2
7.0
7.7
1.1
2
DWC
16.0
17.6
0.9
2
ITL
30.0
33.0
2.0
1
FIU
4.3
4.8
0.9
1
E2OAU
42.0
70.0
2.4
2
E3OAU
30.0
50.0
2.4
2
E3OBU
23.0
30.0
2.2
2
E2OBU
35.0
50.0
2.2
2
OPU
20.0
22.0
2.0
2
HBA
24.0
26.4
2.6
2
RPC
70.0
77.0
4.2
2
RPA
90.0
99.0
4.2
2
MCA
7.0
7.7
1.7
2
VA4
10.0
11.0
1.5
2
VOA
6.5
7.2
0.8
1
DGE
20.0
22.0
2.4
2
DSE
4.3
4.8
0.9
1
GFU
4.3
4.8
0.9
1
TC1
8.5
9.4
0.9
1
TC2
11.5
12.7
1.1
1
SC1
4.0
4.4
0.9
1
SC2
7.0
7.7
1.0
1
SCC / SCE
10.5
11.5
0.8
1
6-3