Multilink and STM1

[Kuldeep singh]

Hi experts,

I've only read about multilink is that it is use for Bundling the Multiple E1 channels into one.

How can i split STM1 channels through Multilink, mean to say, STM1 63 channels divided into

63 pats so that i can distribute each remote location with 2 mbps (per channel =2 mbps) .

I think that we can not split STM channels through Multilink, Plz correct me if i m wrong ?

1. What is use of Multilink : Merge or Split or Both ?

2. is STM1 is collection of 63 E1 channels ?

3. Difference between "show interface serial"   and  "show controller e1"  commands

    Which command will show  physical serial port status and channelized serial port status.  

KS

[Kuldeep singh]

Plz show interest in my post

[Giuseppe Larosa]

Hello Kuldeep,

>> I think that we can not split STM channels through Multilink, Plz correct me if i m wrong ?

your understanding is correct, the capability to multiplex and demultiplex 2 Mbps streams over an STM-1 is a feature of SDH network and it has nothing to do with PPP multilink

1. What is use of Multilink : Merge or Split or Both ?

merge of  member links

2. is STM1 is collection of 63 E1 channels ?

It depends in some cases it is, but these cases are those of a channelized STM-1 not a standard STM-1 interface

3. Difference between "show interface serial"   and  "show controller e1"  commands

    Which command will show  physical serial port status and channelized serial port status. 

the controller e1 is the physical port, the serial inteface in this case is a logical interface associated to a a channel-group that is made of DS0 ( 64 kbps) timeslots in a TDM

the channel-group(s) are defined under controller e1 configuration

in this case channelized refers to DS0 64 kbps timeslots

Hope to help

Giuseppe

[Kuldeep singh]

Dear Giuseppe,

1.  Can you plz provide me sample configuration in which i can see spilt process of  STM1 for 15 locations with allocate

     4 mbps per location ?

2.  Suppose i do not have any Multilink configuration, then i put these two command in router then what will be the

    output

     -  Show interface s0/0

     -  Show controller e1

How these two above commands differs from each other ?

KS

[Giuseppe Larosa · Accepted solution]

Hello Kuldeep,

1)  the STM-1 can be split in many E1 -like 2 Mbps streams that is the building block of the multiplexing/demultiplexing

PPP multilink can be used to make a bundle of two of the derived E1 streams, but again as I noted in my previous post it is not related to the multiplex/demultiplex operations that are part of SDH framework.

look for channelized STM-1 configuration like

http://www.cisco.com/en/US/prod/collateral/modules/ps6267/product_data_sheet0900aecd80350c53.html

http://www.cisco.com/en/US/docs/interfaces_modules/shared_port_adapters/configuration/ASR1000/ASRcstm1.html

In SDH framing in AU-4 mode:

Router(config-ctrlr-tug3)# mode {c-11 | c-12 | t3 | e3}

In SDH framing AU-3 mode:

Router(config-ctrlr-au3)# mode {c-11 | c-12 | t3 | e3 | ct3 | ct3-e1}

http://www.cisco.com/en/US/docs/interfaces_modules/shared_port_adapters/configuration/ASR1000/ASRcstm1.html#wp1153685

Actually there is OC-3 then 3 DS-3 and then 28 DS-1 /E1 in each T3/DS3 container

2)

you will have a controller e1 0/0 and you can have a derived serial object like ser0/0:1 (corresponding to the channel-group number)

controller e1 0/0

channel-group 0 timeslots 1-31

creates

serial0/0:0

so

show int control e1 0/0 provides you OSI layer1 information

sho int ser 0/0:0 provides you OSI layer2

EDit:

note that the number of interface indexes will be greater then that in my example

Hope to help

Giuseppe