CTC Union IPM-4SE, User Manual

Chapter 3  Configuration and Operation 

21 

 
CPE Side: (use the correct MAC address for the local CO unit) 
 

gci 

srcnet 172.16.1.2 255.255.255.0 

ipset 192.168.2.11 255.255.255.0 172.16.1.1 

ceschset 1 1 172.16.1.1 00:02:AB:xx:xx:xx 

cespwidset 1 1 1 

pktsize 1 0 

jitterbd 1 1   

ceschclkset 1 0 

cesfe1mode 1 1 

cesfe1crc 1 1 

cesfe1tsmap 1 x000001FE 

lanset 0 

lanset 1 7 

csave 

3.11.3 Notes on Fractional E1 Operation 

If IPM carries E1 as 'unframed', then it becomes transparent (SAToP). As long as the equipment on both 

sides of IPM equipment have the same framing, then there will be no alarms. However, the advantage of 
using framing (CESoPSN) is that the data bandwidth can be reduced considerably by sending only the 
payload, especially over a satellite link. You must make sure the right timeslots are enabled and match the 
crc4 if enabled or not (cesfe1crc). Duplicate these settings on both IPM4SE units. 

For the hex to timeslot bit mask, each TS is represented by a bit: 

TS bits : 11111111111111111111111111111111 

TS #      33222222222211111111110000000000 

 31~0     10987654321098765432109876543210 

If we breakup into octets, then we can assign hex values: 

1111|1111|1111|1111|1111|1111|1111|1111 

  F |  F |  F |  F |  F |  F |  F |  F 

So, if we want to enable fifteen timeslots, starting with TS1: 

0000|0000|0000|0000|1111|1111|1111|1110 

  0 |  0 |  0 |  0 |  F |  F |  F |  E 

The 

cesfe1tsmap

 value would be 

x0000FFFE

If the timeslot range always starts at TS1, this table will work for you: 

hex map    no. of TS 
x00000002 = 1 
x00000006 = 2 
x0000000E = 3 
x0000001E = 4 
x0000002E = 5 
x0000006E = 6 
x000000FE = 7 

x000001FE = 8 
x000002FE = 9 
x000006FE = 10 
x00000FFE = 11 
x00001FFE = 12 
x00002FFE = 13 
x00006FFE = 14 
x0000FFFE = 15 

x0001FFFE = 16 
x0002FFFE = 17 
x0006FFFE = 18 
x000FFFFE = 19 
x001FFFFE = 20 
x002FFFFE = 21 
x006FFFFE = 22 
x00FFFFFE = 23 

x01FFFFFE = 24 
x02FFFFFE = 25 
x06FFFFFE = 26 
x0FFFFFFE = 27 
x1FFFFFFE = 28 
x2FFFFFFE = 29 
x6FFFFFFE = 30 
xFFFFFFFE = 31