Verilink C100 (880-502893-001) Product Manual - Manual (Page 126)

C100 and C150 SNMP MIB
D-12 Verilink C100 and C150 T1/FT1 CSU/DSUs 6/15/99
The DS1 fractional table identifies which DS1 channels associated with
a CSU are being used to support a logical interface, i.e., an entry in the
interfaces table from the Internet-standard MIB.
For example, consider an application managing a North American
ISDN Primary Rate link whose division is a 384 kbit/s H1 “B” Channel
for Video, a second H1 for data to a primary routing peer, and 12 64-
kbit/s H0 “B” Channels. Consider that some subset of the H0 channels
are used for voice and the remainder are available for dynamic data
calls.
We count a total of 14 interfaces multiplexed onto the DS1 interface.
Six DS1 channels (for the sake of the example, channels 1..6) are used
for Video, six more (7..11 and 13) are used for data, and the remaining
12 are in channels 12 and 14..24.
Let us further imagine that ifIndex 2 is of type DS1 and refers to the
DS1 interface, and that the interfaces layered onto it are numbered
3..16.
We might describe the allocation of channels, in the dsx1FracTable, as
follows:
dsx1FracIfIndex.2. 1 = 3 dsx1FracIfIndex.2.13 = 4
dsx1FracIfIndex.2. 2 = 3 dsx1FracIfIndex.2.14 = 6
dsx1FracIfIndex.2. 3 = 3 dsx1FracIfIndex.2.15 = 7
dsx1FracIfIndex.2. 4 = 3 dsx1FracIfIndex.2.16 = 8
dsx1FracIfIndex.2. 5 = 3 dsx1FracIfIndex.2.17 = 9
dsx1FracIfIndex.2. 6 = 3 dsx1FracIfIndex.2.18 = 10
dsx1FracIfIndex.2. 7 = 4 dsx1FracIfIndex.2.19 = 11
dsx1FracIfIndex.2. 8 = 4 dsx1FracIfIndex.2.20 = 12
dsx1FracIfIndex.2. 9 = 4 dsx1FracIfIndex.2.21 = 13
dsx1FracIfIndex.2.10 = 4 dsx1FracIfIndex.2.22 = 14
dsx1FracIfIndex.2.11 = 4 dsx1FracIfIndex.2.23 = 15
dsx1FracIfIndex.2.12 = 5 dsx1FracIfIndex.2.24 = 16
For North American (DS1) interfaces, there are 24 legal channels,
numbered 1 through 24.
For G.704 interfaces, there are 31 legal channels, numbered 1 through
31. The channels (1..31) correspond directly to the equivalently
numbered time-slots.