CAPÍTULO I: FUNDAMENTACIÓN TEÓRICA
1.2 Marco de Trabajo y Herramientas Utilizadas
1.2.6 Proceso de Desarrollo de Software
The SEP1 is an 8 x STM-1 electrical signal processing board, with two STM-1 electrical interfaces on the front panel.
The EU08 and OU08are interface boards of the SEP1. The TSB8 is an electrical interface switching & bridging board.
Table 5-19 lists the slots for the SEP1, EU08, OU08, and TSB8 in OSN products.
Table 5-19 Slot for the SEP1, EU08, OU08, and TSB8
Product SEP1
(Led out from front panel)
SEP
(Work with
interface boards) EU08/OU08 TSB8 OptiX OSN 3500
(80 Gbit/s) Slots 1–6, 13–16 Slots 2–5, 13–16 Slots 19, 21, 23, 25, 29, 31, 33, 35
Slots 19, 35 OptiX OSN 3500
(40 Gbit/s) Slots 1–6, 13–16 Slots 2–5, 13–16 Not available Slots 19, 35 OptiX OSN 2500 Slots 5–8, 11–13 Slots 6–7, 12–13 Slots 3, 15, 17 Slots 1,
17 OptiX OSN 2500
REG Not available Not available Not available Not available OptiX OSN
1500A Slots 12–13 Not available Not available Not available OptiX OSN
1500B Slots 11–13 Slots 12–13 Slots 14, 16 Slots 14
When used with different interface boards and electrical interface switching & bridging boards, the SEP1 has different access ability, as listed in Table 5-20.
Table 5-20 Different access abilities of the SEP1 When worked with Access ability
None Access and process 2 x STM-1 electrical signals.
EU08 Access and process 8 x STM-1 electrical signals.
OU08 Access and process 8 x STM-1 optical signals.
EU08 and TSB8 Access and process 8 x STM-1 electrical signals, and achieve 1:N (N≤3) TPS protection.
Caution:
The two interfaces on the front panel of the SEP1 are unavailable when used with interface boards.
Caution:
The EU08 and OU08 can only be used when the cross-connect capacity is 80 Gbit/s in OptiX OSN 3500. When the cross-connect capacity is 40 Gbit/s, the EU04 can be used to work with the SEP1.
5.6.1 Functionality
Functionality SEP1 EU08/OU08 TSB8
Basic
function 8 x STM-1 processing board
EU08: 8 x STM-1 electrical interface board
OU08: 8 x STM-1 optical interface board
8-channel electrical interface switching &
bridging board
Optical interface specifications
_
The OU08 supports the I-1 and S-1.1 optical interface, which complies with ITU-T Recommendation G.957.
_
Optical module specifications
Support the detecting and query of the information on optical modules.
Laser can be open and close at optical interfaces.
Automatic laser shutdown function can be enabled or disabled at optical interfaces.
Support the use and monitoring of SFP swappable optical module.
Service
processing Support VC-12/VC-3/VC-4 services.
Overhead processing
Support the processing of the section overheads of STM-1 signals.
Support the processing of the path overheads (transparent transmission and termination).
Support setting and querying J0/J1/C2 byte.
Alarms and performance events
Provide abundant alarms and performance events, which simplify maintenance and administration.
Protection scheme
Realize TPS protection when the SEP1 works with interface boards and switching & bridging boards.
Support two-fiber unidirectional multiplex section protection (MSP), linear MSP and SNCP.
Maintenance
Support inloop and outloop at optical interfaces.
Support inloop and outloop at VC-4 level, locating fault fast.
Support warm and cold reset. Warm reset brings no impact to services.
Support the query of board information.
Support the in-service uploading of FPGA.
Support smooth board software upgrade.
5.6.2 Principle
Figure 5-11 shows the principle block diagram of the SEP1 (1 x STM-1 signal is processed).
Frame synchronous and scrambler
module
Overhead processing module
Logic control module
STM-1 O/E signal Cross-connect unit
Backplane
SCC Interface
module
Data recovery
module
-48 V +3.3 V
Power module +2.7 V
+5 V
+3.3 V（Standby）
STM-1 O/E signal Cross-connect unit
+3.3 V （Standby）
Figure 5-11 The principle block diagram of the SEP1
1. In Receive Direction
The interface module accesses STM-1 electrical signals (for optical signals, O/E conversion is needed), and the data recovery module recovers clock signals. Then, the cock signal and E4/STM-1 electrical signals are sent to the frame synchronous and scrambler module.
The frame synchronous and scrambler module descrambles the received STM-1 electrical signals, converts it into parallel signals, and then sends them to the overhead processing module.
The overhead processing module extracts the overhead bytes from the STM-1 signals, and demultiplexes the signals into one channel of VC-4 signal. The VC-4 signal is then sent to the cross-connect unit through the backplane.
2. In Transmit Direction
The one channel of VC-4 signal from the cross-connect unit are multiplexed into STM-1 signals in the overhead processing unit, and sent to the frame synchronous and scrambler module after being inserted with overhead bytes.
The frame synchronous and scrambler module implements parallel/serial conversion for the received STM-1 electrical signals, and then sends them to the interface module after scrambling.
The interface module sends the STM-1 electrical signals to the cable for transmission.
When optical signals are required, the interface module adopts the OU08, where the signals are sent to fiber after E/O conversion.
3. Auxiliary Units
Logic control module This unit:
− communicates with the SCC and other boards through Ethernet ports.
− collects and reports alarms and performance events.
− process the configuration command from NM.
Power module
Provide the board with required DC voltages.
5.6.3 Front Panel
Figure 5-12 shows the front panels of the SEP1, EU08, OU08, and TSB8.
STAT ACT PROG SRV
SEP1 SEP1
OUT1IN1OUT2IN2
OUT1IN1OUT2IN2OUT3IN3OUT4IN4OUT5IN5OUT6IN6OUT7IN7OUT8IN8 EU08
EU08
OU08
OU08
OUT4IN4OUT3IN3OUT2IN2OUT1IN1OUT8IN8OUT7IN7OUT6IN6OUT5IN5
TSB8
TSB8
SEP1 EU08 OU08 (LC) TSB8
Figure 5-12 The front panel of the SEP1, EU08, OU08, and TSB8
1. Indicators
There are four indicators on the SEP1.
Board hardware status indicator (STAT) – double colors (red, green)
Service active status indicator (ACT) – green
Board software status indicator (PROG) – double colors (red, green)
Service alarm indicator (SRV) – three colors (red, green, yellow) For detailed description of the indicators, see Appendix A.
There are no indicators on the EU08, OU08, or TSB8.
2. Interfaces
Quantity: The SEP1 has two pair of 75-ohm SMB interface, with which the SEP1 can access two channels of STM-1 electrical signal by itself.
Type: SMB connector
Table 5-21 lists the quantity and type of the interfaces of the EU08 and OU08.
Table 5-21 Interfaces of the EU08 and OU08
Interface EU08 N1OU08 N2OU08
Quantity 8 8 8
Access ability 8 x STM-1(e) 8 x STM-1(o) 8 x STM-1(o) Type 8-pair SMB electrical
interface 8-pair LC optical
interface 8-pair SC optical interface
Swappable optical
module — Supported Not supported
The N1OU08 supports swappable optical modules, which simplifies the maintenance to optical modules.
There is no service interfaces on the TSB8.
5.6.4 Protection Configuration
When used with the EU08 and TSB8, the SEP1 can achieve 1:N TPS protection for 8 x STM-1 electrical signals. Table 5-22 lists the TPS protection of the SEP1 in OSN products.
Table 5-22 TPS protection of the SEP1
Product TPS protection TPS configuration OptiX OSN 3500
(80 Gbit/s) OptiX OSN 3500 (40 Gbit/s)
Support two groups of 1:N (N≤3) TPS protection
The board in slot 2 protects the boards in slots 3, 4, and 5.
The board in slot 16 protects the boards in slots 13, 14, and 15.
OptiX OSN 2500 Support two groups of 1:1
TPS protection The board in slot 6 protects the one in slot 7.
The board in slot 13 protects the one in slot 12.
OptiX OSN 2500
REG Not supported —
OptiX OSN
1500A Not supported —
Product TPS protection TPS configuration OptiX OSN
1500B Support one group of 1:1
TPS protection The board in slot 12 protects the one in slot 13.
As an equipment level protection, the TPS protection switches signals to the protection board upon the failure of the working board. This avoids complicated network-level protections effectively, and enhances the reliability of the equipment.