What is bandwidth on DTE-DCE?

[imran_mcse]

I want to know that if i used RS-232 cables as back to back DTE-DCE for connecting two router's DB-60 ports for lab then what will be bandwidth.

If i use this same scenario with V.35 back to back DTE=DCE cross cable then what will be bandwidth.

I want comparison between RS232 cross cable and V.35 cross cable's Bandwidths.

[sachinraja]

Hello Imran,

Personally, I dont feel the bandwidth depends on the cable used here (rs 232 or v.35) ... it all depends on the interface you are using on the router, which tells you the maximum bandwidth on the circuit. All NM serial cards can take upto 128 K bandwidth and WIC serial cards can take upto 2 MB . The cable pin outs between rs 232 and V.35 might differ, but not the bandwidth. Cable pin outs are as given in this URL:

http://www.cisco.com/en/US/products/hw/routers/ps232/products_quick_start_chapter09186a00802f0c2a.html#xtocid194574

[Richard Burts]

Actually in my experience there is a difference in the capability of rs232 and V.35 in relation to bandwidth. Or to be precise in the clockrate on the DCE device. When I have used rs232 cables I find that if I try to push the speed (call it clock rate or call it bandwidth whichever you want) past 56 K to 64 K that the increasing error rates make a limit on the practical speed of the circuit. when I use V.35 cables the interface can easily handle full T1 or E1 rates of up to 2 meg.

HTH

Rick

[mld]

Well to sort up a feew things here.

Bandwith is a command in the cisco router that is used by some routing protocolls to select bestpath, and to some other statistics and printouts.

Clock rate will set the actual TX and RX speed of the link on the DCE side DTE will use what it receives. (assuming sync connection)

EIA/TIA 232 (formar rs232 and similar V.24) will use V.10 for signal transfer (non-ballanced) at phy level

V35 will use V.11 for data signal transfer (ballanced) at phy level and V10 for some status signal transfer at phy level

EIA/TIA 449 (formar RS449 and similar V.36) will only use V.11 for all signal transfer

The transfer rate in the standards are realy low.

(in my mind) V10 is max at 19.200 bps and V11 is max 2 Mbps.

In cisco and many other boxes the actual maximum on transfer rate is dependent on the interface. for

EIA/TIA 232 up to a feew 100Kbps

V35 up to a feew Mbps

hope it helps

/micke