supply, installation and commissioning of managed expandable rack type stm-4 add/dropmultiplexer upgradable to stm-16 as per tec specification no. gr/tx/sdh-10/03 jan11 equipped with4xstm-4, 2xstm-1, 63e1 with 1:2 protection at e1 level. minimum 8 numbers of 10/100t ethernet port with l2switching functionality, redundant power supply, cross connect and synchronisation. offered equipment shouldmatch with existing system of make: tejas. make: tejas or similar.