User manual

8
5) Extended connection type
In this connection type, the converter is not used in pairs, but connected with equipment of other
manufactures.
If Routers with E1 interface are used at remote side, users are required to first confirm all the
parameters of E1 link, such as fractional/transparent E1, PCM30/31, CRC enable/disable, clock
relations, bandwidth distribution and time slot usage etc. If any one of them does not match the
setting of the converter, there will be problems in connection.
In this case, if devices at both ends work in fractional E1 mode, usually the clock relation is easily
ignored. It is suggested that first make sure which device the clock source is on, then devices at
other end should follow the clock on the E1 link.
3.
Product Compatibility
When connecting RC903-V35FE1 converter with fractional E1 devices of other brands (such as
using V.35 to connect fractional E1 interface converters or Routers etc.), or using DXC and MUX
devices between two converters to work in pairs, it is required to follow the instructions:
1) PCM30/31 format must be consistent
2) CRC function enable/disable must be consistent
3) Data engrossment of V.35 interface in G.704 frame structure must be consistent
4) Remote bandwidth distribution and remote E1 port loop-back test functions of devices
are disabled
5) Make sure there is only one clock source in the whole link, the clock mode of all other
PCM devices is in Slave Clock Mode (following E1 link clock).