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HUAWEI CQ1 SL91 4-port channelized STM-1 interface board for HUAWEI OLT

Categories HUAWEI
Brand Name: Huawei
Model Number: AUX SL91
Place of Origin: China
MOQ: 1pc
Price: $100-$200
Payment Terms: T/T, Western Union, MoneyGram
Supply Ability: 500pcs/week
Delivery Time: 5-8 days
Packaging Details: 1pc into a spare inner foam carton and pack with exteral wooden carton
Product name: Huawei AUX SL91
Warranty: Six month
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HUAWEI CQ1 SL91 4-port channelized STM-1 interface board for HUAWEI OLT

Version Description

The functional version of CQ1 boards is SL91.


CQ1 boards apply to OptiX RTN 910 NEs to transparently transmit STM-1 services over packet radio networks. CQ1 boards receive/transmit only channelized STM-1 services.

CQ1 boards are used in the following scenarios:

STM-1 services are transparently transmitted over packet radio networks.

Multiprotocol Label Switching (MPLS) tunnels traverse a TDM network.

Circuit emulation service (CES) E1 services are converged to channelized STM-1s.

Transparently Transmitting STM-1 Services over Packet Radio Networks

Figure 1 Application scenario of CQ1 boards (1)

Carrying MPLS Tunnels over a TDM Network

Figure 2 Application scenario of CQ1 boards (2)

Converging CES E1 Services to Channelized STM-1s

Figure 3 Application scenario of CQ1 boards (3)


The IF boards shown in Figure 1 to Figure 3 must be general-purpose IF boards or cross polarization interference cancellation (XPIC) IF boards working in native E1+Ethernet or native STM-1+Ethernet mode.

Functions and Features

CQ1 boards receive and transmit four channels of channelized STM-1 optical/electrical signals.

Table 1 lists the functions and features supported by CQ1 boards.

Table 1 Functions and features that CQ1 boards support

Function and FeatureDescription
Basic functionsReceives and transmits four channels of channelized STM-1 optical/electrical signals.
Supported packet service types

Circuit emulation service (CES) E1


Port specificationsOptical ports

Use small form-factor pluggable (SFP) optical modules and support optical ports of the Ie-1, S-1.1, L-1.1, and L-1.2 types.

Comply with ITU-T G.957.

Electrical ports

Use SFP electrical modules.

Comply with ITU-T G.703.

Fractional E1Transparently transmits 64 kbit/s CES services.
CESMaximum number of services80
Encapsulation mode

CESoPSN (CESoPSN stands for circuit emulation services over packet switch networks)

SAToP (SAToP stands for Structure-Agnostic Time Division Multiplexing over Packet)

Idle timeslot compressionSupported only in CESoPSN mode
Jitter buffering time (us)875 to 16,000
Packet loading time (us)125 to 5,000
CES ACR(ACR stands for adaptive clock recovery)Supported, but the NE can only function as a master node
Transparent transmission of SDH overheadsSupported
ML-PPPType of links carrying ML-PPP linksE1s in channelized STM-1s
Maximum number of supported PPP links252
Maximum number of supported ML-PPP groups32
Maximum number of links in one ML-PPP group16
ClockClock source

Each line port provides one channel of SDH line clock signals.

Each board supports two channels of E1 clock signals over its STM-1 ports.

Clock protection

Protection implemented by providing clock sources with different priorities

Protection implemented by running Synchronization Status Message (SSM) protocol

Protection implemented by running extended SSM protocol

SDH line clock retimingSupported
Linear multiplex section protection (MSP)1:1 linear MSP
DCNOutband DCNEach SDH line port can provide one data communications channel (DCC) that is composed of three DCC bytes, nine DCC bytes, or 12 DCC bytes.
Inband DCNTransmits DCN information over ML-PPP links.
Operation and maintenanceLoopback

Supports inloops at STM-1 ports.

Supports outloops at STM-1 ports.

Supports inloops over E1 channels.

Supports outloops over E1 channels.

Warm and cold resettingSupported
Switching a laser on or offSupported
Manufacturer information queryingSupported
Power consumption queryingSupported
SFP module information detecting and queryingSupported

Working Principle and Signal Flow

This section describes how the function units of a CQ1 board process channelized STM-1 optical signals.

Function Block Diagram

Figure 1 CQ1 board function block diagram

Signal Processing in the Receive Direction

Table 1 Signal processing in the receive direction of a CQ1 board

StepFunction UnitProcessing Flow
1Signal interface unit

Receives channelized STM-1 signals.

Regenerates STM-1 optical signals.

Checks for R_LOS alarms.

Converts STM-1 optical signals into STM-1 electrical signals.

2SDH processing unit

Restores clock signals.

Synchronizes frames and checks for R_LOS and R_LOF alarms.

Descrambles signals.

Checks B1 and B2 bytes and generates alarms and performance events, if any.

Checks the M1 byte and bits 6-8 of the K2 byte, and generates alarms and performance events, if any.

Checks for changes in Synchronization Status Messages (SSMs) in the S1 byte and reports the SSM status to the system control and communication unit.

Extracts orderwire bytes, auxiliary channel bytes (including F1 and serial bytes), DCC bytes, and K bytes, and transmits the bytes to the logic processing unit.

Adjusts AU pointers and generates performance events, if any.

Checks higher order path overheads and generates alarms and performance events, if any.

Decapsulates E1 signals from the STM-1 signals.

3Packet processing unit

Frames E1 signals.

Performs CES emulation.

Performs Multilink Point-to-Point Protocol (MP-PPP) processing.

Encapsulates PWE3 services and converts them into Ethernet services.

4Logic processing unit

Grooms services from service buses to the GE bus on the backplane.

Sends service signals to the packet switching unit.

Signal Processing in the Transmit Direction

Table 2 Signal processing in the transmit direction of a CQ1 board

StepFunction UnitProcessing Flow
1Logic processing unit

Receives service signals from the packet switching unit.

Grooms services from the GE bus on the backplane to service buses.

2Packet processing unit

Decapsulates service signals.

Restructures CES packets.

Converts signals into E1 signals and sends the E1 signals to the SDH processing unit.

3SDH processing unit

Multiplexes E1 signals into STM-1 signals.

Sets higher order path overheads.

Sets AU pointers.

Sets multiplex section overhead bytes.

Sets regenerator section overhead bytes.

Scrambles signals.

4Signal interface unitConverts electrical signals into optical signals.

Control Signal Processing

The CQ1 board is directly controlled by a CPU on the system control and communication unit. The CPU issues configuration and query commands to other units of the board over the control bus. These units send command responses, alarms, and performance events to the CPU unit over the control bus.

The logic control unit decodes the address read/write signals from the CPU.

Power Supply Unit

The power supply unit receives two -48 V power supplies from the backplane. It then converts the -48 V power supplies into +3.3 V power and supplies the +3.3 V power to other units on the board.

Clock Unit

The clock unit performs the following operations:

Extracts line clock signals or E1 clock signals and transmits them to the system control and communication unit.

Receives system clock signals from the control bus on the backplane and supplies clock signals to other units on the board.

Front Panel

A CQ1 board has indicators and STM-1 ports on its front panel.

Front Panel Diagram

Figure 1 Front panel of a CQ1 board providing optical ports

Figure 2 Front panel of a CQ1 board providing electrical ports

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