setting up e1

[carl_townshend]

Hi all, I was told before that e1 is same as serial link, now im being told it has channels, I dont understand this, can you use e1 as normal wan link same as serial WIC ?

[royalblues]

Hi carl,

E1 cards are channelised which means you have to create channel groups & timeslots to support the bandwidth u configure on the link.

The serial link such as WIC-1T does not require any such configuration. The bandwidth is the bandwidth provided by the provider

eg if you want to configure a 512K link on the E1 you would use the following command

controller e1 0/0

channel-group 0 timeslots 1-8

this would create a serial link serial 0/0:0

which you can configure the way you like.

HTH

Narayan

[ilya.varlashkin]

E1 link is also the one you connect to your serial WIC, however in that case you also have interface converter from G.703 to serial. That box is technically speaking E1 to the line while speaking 'serial' towards your router. With dedicated E1 controller you connect line directly to your router. Benefits - you have more elaborate diagnostic and troubleshooting tools (like end-to-end loopback), downside - usually they're slightly more expensive than WIC-1T + interface converter.

E1 links can be framed (channalized) and unframed. If you use framed setup, you lose 64Kbps (1 channel) for multiframe sync. There are WIC cards which supports both framed and unframed mode, and there are also those that support only unframed mode.

[carl_townshend]

which would be the easiest to set up, if its a pure wan link to my other office, how would i use all channels, and how many channels do they have ?

[ilya.varlashkin]

If your budget allows, get E1 WIC that supports only unframed mode (they should be cheapest), but make sure that your other end of the link also supports unframed mode. Once you have cards and link, it should take about 5 minutes to get ping working from one router to another, the rest is routing.

Here is example of config:

controller e1 0/0

channel-group 0 unframed

! Only one side should have next line

clock source internal

!

interface serial 0/0:0

ip addr 255.255.255.252

!

And you're done.

[ariazk]

Configuring Full-Rate Unchannelized E1 Bandwidths

To configure the full-rate unchannelized E1 bandwidth at a port, you assign the maximum bandwidth (2048 kbps) when you include unframed on the command line in controller configuration mode. The following example shows the steps you use to create full-rate unchannelized E1 operation at any port.

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Step 1 Specify a Controller: To configure the available full E1 bandwidth on an unchannelized port, you select the E1 controller from the global configuration mode:

Router> enable

Password: (you enter your administrative password)

Router# config terminal

Enter Configuration commands, one per line. End with CNTRL/Z.

Router(config)# controller e1 2/0/0

Step 2 Specify a Channel Group: To specify a channel group number as a full-rate unchannelized E1 port, you assign a channel-group number from 1 to 31 and specify unframed:

Router(config-controller)# channel-group 6 unframed

Router(config-controller)

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Note You can not make timeslot assignments on unframed E1 ports.

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The channel group command assigns channel-group number 6 to timeslots 0 to 31 (the entire available E1 unframed bandwidth) and subslot 0 at port 0 of the 24-Port Channelized E1/T1 line card in router chassis slot 2.

Whenever you configure an E1 channel-group as unframed, you assign all 32 timeslots (the entire available 2048 kbps E1 bandwidth) to that port and channel group.

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Note When you specify unframed for an E1 channel, you only configure a single channel on a port.

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Step 3 Specify Additional Controller Parameters: Specify any other E1 controller parameters for this port and other ports (see Table 5-2 and the "Controller Configuration Commands" section).

Step 4 Save the controller configuration to NVRAM

Router(config-if)# end

here is the link

http://www.cisco.com/en/US/products/hw/routers/ps133/products_configuration_guide_chapter09186a00806da7eb.html#wp1051758

thanks

[carl_townshend]

thanks for that, so why are they framed and have different channels ? if I wanted to use the framed approach also would I just tyoe timeslots 1-31 ?

cheers

[ariazk]

yes

thanks

[carl_townshend]

how would I configure these frames, would you configure a sub interface and assign a timeslot to it ? and can u configure ip etc on this ?

[royalblues]

carl,

you always configure the timeslots on the controller which creates a corresponding serial interface. You can them use subinterfaces on that and assign IP. See below the configuration of 2 frame connection between of 1MB each using subinterfaces

controller E1 0/0/0

channel-group 0 timeslots 1-16

channel-group 1 timeslots 17-31

interface Serial0/0/0:0

bandwidth 1024

no ip address

encapsulation frame-relay IETF

frame-relay lmi-type ansi

interface Serial0/0/0:0.1 point-to-point

ip address

frame-relay interface-dlci 50 IETF

interface Serial0/0/0:1

bandwidth 1024

no ip address

encapsulation frame-relay IETF

frame-relay lmi-type ansi

interface Serial0/0/0:1.1 point-to-point

ip address

frame-relay interface-dlci 51 IETF

HTH

Narayan

[carl_townshend]

can you configure 2 1 meg connections, using ppp rather than frame relay ? and why is the above config showing 4 interfaces ?

[royalblues]

Hi carl,

You can use PPP for your serial connection and make 2 1MB connections.

The configuration i posted earlier was to show the use of subinterfaces and hence u find 4 interface refernces. Its actually two main interfaces and 2 subinterfaces.

Whenever you want to break a single E1 to multiple connections u have to use the above configuration. The cheannel group command creates the main interface and the Subinterface is used for assigning ip addresses & all.

HTH

Please rate if the any of the previous posts help

Narayan