INTERNAL White Paper on Clock Transmission over Radio

Issue 1.40 (2011-03-107) HUAWEI Confidential Page 8 of 130

1 Specifications for Clock Features of OptiX RTN Equipment

1.1 OptiX RTN 600

1.1.1 OptiX RTN 600 V100R001

The OptiX RTN 600 V100R001 includes the OptiX RTN 610 V100R001, OptiX RTN 620 V100R001, and OptiX RTN 605 V100R001. The OptiX RTN 610 V100R001 and OptiX RTN 620 V100R001 support four synchronization modes:

Synchronization with clock information contained in TDM E1 service signals Synchronization with clock information contained in SDH service signals Synchronization with external clock sources Synchronization with clock information from the air interface

The OptiX RTN 605 V100R001 is PDH radio equipment, which supports only transparent transmission of the TDM E1 clock and does not support the retiming function.

Version No.

OptiX RTN 610/620 V100R001

Board Name

Front Panel Synchronization Mode

Port SSM Remarks

PO1

TDM E1 This board provides eight E1 ports.

Not supported

When the system clock traces the clock of the RNC or BSC and the entire network is synchronous, you need to enable the retiming function if the tributary clock has poor performance. After the retiming function is enabled on an E1 port, the E1 port cannot transparently transmit

INTERNAL White Paper on Clock Transmission over Radio

Issue 1.40 (2011-03-10) HUAWEI Confidential Page 9 of 130

Version No.

OptiX RTN 610/620 V100R001

Board Name

Front Panel Synchronization Mode

Port SSM Remarks

clock information but transmits the system clock.

PH1

TDM E1 This board provides 16 E1 ports.

Not supported

When the system clock traces the clock of the RNC or BSC and the entire network is synchronous, you need to enable the retiming function if the tributary clock has poor performance. After the retiming function is enabled on an E1 port, the E1 port cannot transparently transmit clock information but transmits the system clock.

SL1

STM-1 This board provides one STM-1 port.

Supported

-

SD1

STM-1 This board provides two STM-1 ports.

Supported

-

SLE

STM-1 This board provides one STM-1 port.

Supported

-

SDE

STM-1 This board provides two STM-1 ports.

Supported

-

IF1A

Clock from the air interface

This board provides one clock from the air interface.

Supported Note: Supported only in STM-1 mode.

To maximize clock quality, ensure that the IF1A board does not work in 4E1, 8E1, 16E1, or E3 mode if possible, if the IF1A boards construct a long radio link and transmits clock information.

IF1B

Clock from the air interface

This board provides one

Supported

To maximize clock quality, ensure that the

INTERNAL White Paper on Clock Transmission over Radio

Issue 1.40 (2011-03-10) HUAWEI Confidential Page 10 of 130

Version No.

OptiX RTN 610/620 V100R001

Board Name

Front Panel Synchronization Mode

Port SSM Remarks

clock from the air interface.

Note: Supported only in STM-1 mode.

IF1B board does not work in 4E1, 8E1, 16E1, or E3 mode if possible, if the IF1B boards construct a long radio link and transmits clock information.

EFT4

- - Not supported

The EFT4 board does not support clock synchronization.

PXC

External clock This board provides one external clock port, which supports one external clock input and one external clock output.

Supported

This external clock port is the external clock and wayside E1 multiplexing port, which supports the 2 Mbit/s or 2 MHz mode. It adopts a 75-ohm SMB co-axial connector.

In the case of a base station where no external clock port is available, the external clock port on the OptiX RTN 620 V100R001 outputs the 2 Mbit/s clock signal that is directly interconnected with an E1 port on the base station. Therefore, clock transmission is implemented only if the base station meets corresponding requirements. The OptiX RTN 620 V100R001 supports a maximum of two PXC boards. That is, The OptiX RTN 620 V100R001 outputs a maximum of two external clock signals.

INTERNAL White Paper on Clock Transmission over Radio

Issue 1.40 (2011-03-10) HUAWEI Confidential Page 11 of 130

As shown in the preceding diagrams of front panels, green ports indicate that the ports support the

clock synchronization function. When a radio network consists of OptiX RTN 610 V100R001 NEs and OptiX RTN 620 V100R001

NEs and has not more than 10 hops, the BITS clock or a clock of quality equivalent to the BITS clock meets the requirements for clock quality after transmitted over the radio network to a base station.

Version No.

OptiX RTN 605 V100R001

Board Name

Front Panel Synchronization Mode

Port SSM Remarks

1A

Transparently transmitted TDM E1 signal clock

This board provides eight E1 ports.

Not supported

The OptiX RTN 605 V100R001 does not have the system clock and does not support the E1 retiming function.

1B

Transparently transmitted TDM E1 signal clock

This board provides 16 E1 ports.

Not supported

The OptiX RTN 605 V100R001 does not have the system clock and does not support the E1 retiming function.

2B

Transparently transmitted TDM E1 signal clock

This board provides 16 E1 ports.

Not supported

The OptiX RTN 605 V100R001 does not have the system clock and does not support the E1 retiming function.

INTERNAL White Paper on Clock Transmission over Radio

Issue 1.40 (2011-03-10) HUAWEI Confidential Page 12 of 130

As shown in the preceding diagrams of front panels, green ports indicate that the ports support the

clock synchronization function. When a radio network consists of OptiX RTN 605 V100R001 NEs and has not more than 10 hops,

the BITS clock or a clock of quality equivalent to the BITS clock meets the requirements for clock quality after transmitted over the radio network to a base station.

The OptiX RTN 605 V100R001 supports only transparent transmission of clock information contained in E1 signals. It does not have the system clock and does not support the E1 retiming function. Therefore, OptiX RTN 605 V100R001 supports clock transmission over a maximum of 10 hops.

1.1.2 OptiX RTN 600 V100R002

The OptiX RTN 600 V100R002 includes the OptiX RTN 610 V100R002 and OptiX RTN 620 V100R002. The OptiX RTN 610 V100R002 and OptiX RTN 620 V100R002 support four synchronization modes:

Synchronization with clock information contained in TDM E1 service signals Synchronization with clock information contained in SDH service signals Synchronization with external clock sources Synchronization with clock information from the air interface

Version No.

OptiX RTN 610/620 V100R002

Board Name

Front Panel Synchronization Mode

Port SSM Remarks

PO1

TDM E1 This board provides eight E1 ports.

Not supported

When the system clock traces the clock of the RNC or BSC and the entire network is synchronous, you need to enable the retiming function if the tributary clock has poor performance. After the retiming function is enabled on an E1 port, the E1 port cannot transparently transmit clock information but transmits the system clock.

PH1

TDM E1 This board provides 16 E1 ports.

Not supported

When the system clock traces the clock of the RNC or BSC and the entire network is synchronous, you need to enable the retiming function if the tributary clock has poor performance. After the retiming function is enabled on an E1 port, the E1 port cannot transparently transmit clock information but transmits the system clock.