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FAQ: Points for attention in interconnection between the new E1-F card and traditional E1/CE1 for mid-low end router

Publication Date:  2012-07-27 Views:  224 Downloads:  0
Issue Description
ROUTER-A====2M link=====ROUTER-B

Alarm Information
The default E1-F interconnects with the traditional E1; E1-F is not up physically, and its transmission is normal. Perform loop test at both ends of the local, and it is normal.

Handling Process

  Change the format of E1-F to unframed, and then it could interconnect with the traditional E1 2M of non-time slot;

 Or, change the E1 to CE1, and bind all time-slot; however, this reduces 64K bandwidth of link since there are only 31 time-slots could be used in CE1.  

Root Cause
 1) Huawei’s E1-F card has two labels: fractional E1, E1-F;

2) Huawei’s E1/CE1 are all on the same card, with labels including: E1, 2E1, 4E1, E1/CE1/PRI;

3) E1-F is defaulted to format of framed, and E1 is unframed format alone. The diversity in frame format causes the data frame non-recognizable.