Clock Cable; Introduction - Huawei S7700 Hardware Description

S7700 Smart Routing Switch
Hardware Description
Table 6-15 Technical specifications of the optical fiber
Item
Fiber
transmission
mode
Connector
Outer diameter

6.7 Clock Cable

This section describes the structure and technical specifications of the clock cables.

6.7.1 Introduction

The external synchronization interface of the S7700 is used for clock and time synchronization.
The S7700 can be connected to the external clock source or clock source device through the
clock cable.
The clock cable is used to connect the S7700 with the clock interface of the external equipment.
With the cable, the S7700 can receive 2-channel 2.048 MHz or 2.048 Mbit/s synchronous clock
signals provided by the upstream device. The S7700 can also offer 2-channel 2.048 MHz or
2.048 Mbit/s synchronous clock signals to the downstream device.
When the S7700 is connected to the clock interface of the external equipment through the clock
cable, the S7700 can receive the 2-channel TOD or DCLS synchronous clock signals provided
by the upstream device. The S7700 can also offer 2-channel TOD or DCLS synchronous clock
signals to the downstream device.
One end of the clock cable is the RJ45 connector, which is connected to the BITTS interface on
the SRU of the S7700. The other end of the clock cable is connected to the external clock device.
The connector type depends on the type of the external clock device. The external clock device
connected to the S7700 can be the SubMiniature version B (SMB) clock source, Boyonet Neil
Councilman (BNC) clock source, RJ45 clock source, and RJ45 time source.
Figure 6-6 Clock cable connections
S7700 clock
According to the functions and interface types of the external clock device connected to the
S7700, the following cables can be selected:
Issue 02 (2012-09-10)
Specification
Single mode/multimode
LC/PC
2 mm
Cable 1
interface
RJ45 interface
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Transmultiplexer
SMB interface
Cable 2
External clock
device
SMB/BNC/RJ45
interface
6 Cables
166