cds1LineType

This variable indicates  the  variety  of  DS1
Line  implementing  this  circuit.  The type of
circuit affects the number of bits  per  second
that  the circuit can reasonably carry, as well
as the interpretation of the  usage  and  error
statistics.
              
The reasons behind adding 'cds1Linetype' object (apart 
from 'dsx1LineType' in DS1-MIB.my) for 'line type', with 
enums from 'other(1)' to 'dsx2E2(11)' replicated,  are 
following: 
1) Addition of the two new enums (viz. 'dsx1E1Q50' and
'dsx1E1Q50CRC') in the standard DS1-MIB might not take 
place in near future; that's why it was decided to 
have a new object 'cds1LineType'. 
2) A way was needed to be provided to configure 'line type'
from CLI (Command Line Interface) for service modules 
supporting line type values from 'dsx1LineType' as well as 
'cds1LineType', without having to modify two separate 
parameters and at the same time, making sure that CLI 
parameter values directly map to the MIB values.
              
Hence, enums from 'other(1)' to 'dsx2E2(11)' from object 
'dsx1LineType' are replicated, and the new enums are added 
as 'dsx1E1Q50(20)' and 'dsx1E1Q50CRC(21)'. The gap between 
'dsx2E2(11)' and 'dsx1E1Q50(20)' provides a safe margin 
in the case of modifications in 'dsx1LineType' in future; 
so the CLI can still have the same enums as the standard
MIB.
              
It is to be noted that objects 'dsx1LineType' and 
'cds1LineType' are mutually exclusive. Setting both in a 
SET request (with the exception of value 'other(1)') 
should result into an 'INCONSISTENT VALUE' error.
              
In the case of successive 'SET' requests, the value 
associated with the latest request should prevail
irrespective of the object ('dsx1LineType' or 
'cds1LineType') used.
              
Following values reflect the corresponding values
in 'dsx1LineType' object in DS1-MIB.
              
dsx1ESF         Extended SuperFrame DS1 (T1.107)
dsx1D4          AT&T D4 format DS1 (T1.107)
dsx1E1          ITU-T Recommendation G.704 (Table 4a)
dsx1E1-CRC      ITU-T Recommendation G.704 (Table 4b)
dsxE1-MF        G.704 (Table 4a) with TS16
                multiframing enabled
dsx1E1-CRC-MF   G.704 (Table 4b) with TS16
                multiframing enabled
dsx1Unframed    DS1 with No Framing
dsx1E1Unframed  E1 with No Framing (G.703)
dsx1DS2M12      DS2 frame format (T1.107)
dsx1E2          E2 frame format (G.704)
              
The recommended value for 'dsx1LineType' object is 
'other'(1) for following values.
              
dsx1E1Q50(20)  ITU-T G.704 with TS16 bits 5,7,8 set to
               101. In all the other cases TS16 bits 5,7,8
               set to 111.(Table 14)
dsx1E1Q50CRC(21): dsx1E1Q50 with CRC.
              
For clarification, the capacity for each E1 type
is as listed below:
dsx1E1Unframed - E1, no framing = 32 x 64k = 2048k
dsx1E1 or dsx1E1CRC - E1, with framing,
no signalling = 31 x 64k = 1984k
dsx1E1MF or dsx1E1CRCMF - E1, with framing,
signalling = 30 x 64k = 1920k
              
For further information See ITU-T Recomm G.704

MIB

CISCO-DS1-EXT-MIB

OID

.1.3.6.1.4.1.9.9.229.1.1.1.1.1

Type

column

Access

readwrite

Status

current

Parent

cds1ConfigEntry

Table

cds1ConfigTable

Siblings

4