Multi-Service Optical PCM Multiplexer yang disempurnakan

Following the rapid growth of operators or carriers, the market requires a reliable system to transmit data and voice through the distance over the existing TDM networks. Therefore, the appearance of PCM multiplexer technology has enlarged the coverage network of operators and increased their revenues, without deploying expensive ADM equipments, significantly reduces CAPEX and OPEX.

Our PCM product series mainly focuses on enterprise, corporate network and telecommunication industry. Large enterprise network usually have specific requirements for voice and data communication, for example: PBX analog interface, subscriber loop interface, Ethernet, V. 35 data, V. 24 data, etc. The PCM product series provides vary analog interfaces and multiple data interfaces, offers the maximum flexibility and capacity with system solutions that can meet their needs.

Based on MSOP (Multi-Service optical PCM), to meet the requirement for abundant E1 channels by customer who rely on E1 service, Enhanced Multi-Service optical PCM (EMSOP) provide extra E1 channels to enrich the product type. Furthermore, EMSOP is designed with 1+1 protection feature to increase the security level of the service.

1+1 protection
Dual optical ports transmission device can achieve 1+1 protection for service. The mechanism of protection includes 2 parts: Switch-over and recover. Switch-over indicates that when the abnormal working channel happens, it can switch to the backup channel. Recover indicates after the fault is removed, it can switch-over back to the master channel.

Switch-over
Adopt "dual transmitter receive the better one" mechanism, namely, at the transmitter side, 2 fiber work spontaneously, receiver side will receive the master channel, when the fault happens to the master one, it will switch over to the backup one in 50ms. At the same time, send alarm to the NMS.
The faults of optical channel include:
----Optical signal disappear
----Frame synchronization loss
----Bit error rate over the threshold

Recover Mechanism
Through the configuration of NMS, the operator can set the waiting time of recover. There still exists the disconnection phenomenon of the master channel, so avoid frequent switch-over, normal, until the master channel is stable then execute recover operation. According to SDH technical standard, the waiting time of recover should be 5~12 minutes.

Network Management Functions
----Attribute the master and backup channel;
----Manually switch over to a certain channel;
----Set waiting time of recover.

Features
Based on ASIC, simple circuit, low power consumption and high reliability.
Standard compact 1U rack with the characteristics of small size, light weight and easy for installation.
Providing Single-Fiber bidirectional or Dual-Fiber operating mode, SC/FC, 1310nm/1550nm, up to 120 km.
Provides single or dual optical link with 1+1 protection.
Providing 4/8/16 Transparent E1 interfaces according to demands of clients. Impedance: 120Ω/75Ω.
Providing 8/16/30/60 channels user interface with various options of low speed service modules include FXO, FXS, FXS with reverse polarity function, magnet telephone, audio 2/4 wire (with or without E&M signaling), V. 24, Fast Ethernet, V. 35, 64K unidirectional Interface.
FE interface on board: 10/100Base-Tx autosense mode, bandwidth granularity 0.5M, maximal bandwidth: 100M. 4FE version support free switching mode and isolation mode. Support jumbo frame: 1916.
FE interface of service module: 10/100Base-Tx autosense mode, maximal bandwidth: N*64Kbit/s, n=1~30.
Telephone interface supports CID (caller identification) function.
V. 35 interface: N*64Kbit/s, n=1~15, DCE mode.
Provides 1 channel RS232 asynchronous data port.
Provides 1 channel Order Wire Telephone.
Provides a set of DIP switches for setup and maintenance testing.
Provides a complete alarm and LED status indicator.
AC or DC power supply.