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Network Connection at the modem or CSU/DSU

RomanB1005
Beginner
Beginner

Hello Alll ,

Such a stupid question , but i have little bit mess about this...

Which WAN interfaces support cisco devices ...  in curiculums is wrote :

Cisco devices support the EIA/TIA-232, EIA/TIA-449, V.35, X.21, and EIA/TIA-530 serial standards.

Is possible connect to router f.e DB.60 and from this to csu/dsu ...

Do you have somebody some clear table with explaining about which cable can be use with which WAN technologi  ?

When i use null modem that is means some reduction in the middle of connection , after that i have to use clock rate setup on DCE side (router)

And last question clock rate is used which with purpose of synchronisation , not a bit rate / bandwidth .. ?

2 Accepted Solutions

Accepted Solutions

vmiller
Rising star
Rising star

The DB 60 end is for the serial port of the router. The other end matchs the csu/dsu.

generally, EIA-232 is for sub rate (56 or 64k ) circuits. 449 x.21 and 530 are for T-1 or greater.

The kind of cable you need is usually specified by the csu/dsu vendor. Over all they are all some form of serial link,

frame relay, fractional DS-3....

Yes you will need to set a clock rate on which ever device acts as dce. here is a sample. it uses frame-relay, but the concepts are similar.

http://www.cisco.com/en/US/partner/tech/tk713/tk237/technologies_configuration_example09186a0080094a3c.shtml

clock rate establishes the rate at which the link will run. you need this in back to back setups since there is no carrier network providing the timing. it is a bit rate. (bps) bandwidth is not used for timing on circuits

http://www.anythingoverip.co.za/tutorials/course-content/ccna/clock-rate-and-bandwidth-commands/

View solution in original post

Cisco devices support all those standards, because you can have different network cards plugged into the devices. For example you can have one of those big Cisco switches at ISP and they can have CSU/DSU devices on them where your router connects to.

Hope this helps

Eugen

View solution in original post

4 Replies 4

vmiller
Rising star
Rising star

The DB 60 end is for the serial port of the router. The other end matchs the csu/dsu.

generally, EIA-232 is for sub rate (56 or 64k ) circuits. 449 x.21 and 530 are for T-1 or greater.

The kind of cable you need is usually specified by the csu/dsu vendor. Over all they are all some form of serial link,

frame relay, fractional DS-3....

Yes you will need to set a clock rate on which ever device acts as dce. here is a sample. it uses frame-relay, but the concepts are similar.

http://www.cisco.com/en/US/partner/tech/tk713/tk237/technologies_configuration_example09186a0080094a3c.shtml

clock rate establishes the rate at which the link will run. you need this in back to back setups since there is no carrier network providing the timing. it is a bit rate. (bps) bandwidth is not used for timing on circuits

http://www.anythingoverip.co.za/tutorials/course-content/ccna/clock-rate-and-bandwidth-commands/

ok , that  means , the sentence "Cisco devices support the EIA/TIA-232, EIA/TIA-449, V.35, X.21, and EIA/TIA-530 serial standards."  is not correct ,except this up , cisco provides WIC for db.60 ? and on the other side could be any of serial interfaces ... ?

Thanks .. .

Cisco devices support all those standards, because you can have different network cards plugged into the devices. For example you can have one of those big Cisco switches at ISP and they can have CSU/DSU devices on them where your router connects to.

Hope this helps

Eugen

Many thanks ....

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