i really do not know How the AS5300 connect to the PBX,

[w.zhanghua]

Just 4E1 from as5300 connect to the PBX?

What's the cable?

i supposed the AS5300 should connect to the PSTN Switchs in teleco CO,

what's the difference between the PBX and PSTN switch.

any ideal,

thank you

[j.armas]

it depends on the pbx conector, the as5300 has a rj48 conector, usually pbx has bnc conectors, so you might use the following part CAB-E1-RJ45BNC=, the configuration might be different for the PBX and the Telco, that depends on the country standards, telco standards, etc.

Regards!

José Armas

Intersys México S.A. de C.V.