Reality in SDH Access

To provide lebarpita lower-level sub-2Mbps within the scope of SDH, some manufacturers provide access to the sound frequency at ADM 4 / 1 them to memultipleks and mendemultipleks E1 stream. It is not part of the SDH hierarchy and its nature is not different from pemultiplekan and pendemultiplekan an E1 stream provided by the PDH equipment.If desired the pemultiplekan first order to make a 64 kbps channel is always available for its users, some ADM 4 / 1 actually has a limited ability to cross-connect 1 / 0 (hierarchical relationship to 0 or 64 kbps to the first hierarchy or E1) to distribute and integrate the channel- canal into the streams E1 before pack it into the structure of the VC-12.Many engineers (engineer) networks assume that the DXC-DXC 1 / 0 is no longer needed, when the cross connection 1 / 0 can be made in its ADM. ADM-ADM if it is possible to meet the provision of small-scale series of 64 kbps, while they do not have the ability to cross connection or arrangement of the DXC 1 / 0, then the reliance solely on the ADM-ADM for cross connection can cause many problems for operators menyediaan SDH network services sub E-1.In planning the migration to SDH in full, the network operators should consider the two roles are taken by the DXC 1 / 0 in delivering services efficiently n x64 kbps over mixed network SDH / PDH: namely channeling and integrating the nx 64 kbps services into the access network and focus (hubbing) into the core transport network.DXC-owned high capacity 1 / 0 makes it very efficient to distribute and integrate the communication traffic of 64 kbps or nx 64 kbps before heading to the SDH network. Hubbing with DXC DXC-1 / 0 the transport network negating the need for a complete meshing in lane highway E1 over SDH transport networks to provide services sub-E1. DXC 1 / 0 can be used to break the facility into a level of E1 64 kbps DXC and repackage them for the next transmission. Deployment strategy DXC 1 / 0 in this way would also allow a network management system "sub-E1" are spread out in parallel with the overall management of the SDH system.ADM relationships in ring (a ring) in the SDH access layer can be viewed as an entity with the interface between E1 with 64 kbps channels with the ability to cross connect, but so can the ADM ring is viewed as a DXC 1 / 0?However the key difference between ADM rings that have the ability 1 / 0 and a DXC 1 / 0 is true is in terms of maximum capacity. Interface STM-1 (or STM-4, if available) will form a barrier that is bottle neck for the transport channels of 64 kbps through a hoop or ring. The limit is 1890 or 63 E1 channels. While the ring is unidirectional, this condition can not be made for the second time.What if a flexmux with integrated capabilities 1 / 0 is used in combination with an ADM 4 / 1? A flexmux memultipleks generally low bit rate and channels sound frequencies into multiple streams of E1, and may also be associated with E1 ports of an ADM 4 / 1. During a number of exit channels (outgoing) E1 in a flexmux limited to two or three, they should be filled as completely as possible. This incorporation may be formed using cross-connection capabilities of its flexmux, namely an entrance channel (frequency noise) is placed into the stream of E1 is given to the ADM 4 / 1.Ability 1 / 0 in the ADM 4 / 1 and flexmuxnya used to integrate the communication traffic towards the high end of its network. However, ring ADM 4 / 1 will act as a DXC 1 / 0 only in the following cases:

    * ADM 4 / 1 has the ability DXC 1 / 0 non-blocking between tributary E1 and 63 E1 streams are packaged in STM-1 stream is done via the ADM 4/1-nya.
    * A number of E1 in a virtual tributary cross-connect does not exceed 63.
    * Ability 1 / 0 is used to integrate the traffic at the level of access in terms of the network.