Section 150-441-124
June 12, 1997
Revision 01
Page 10
PairGain Engineering - Plant Series
HiGain HLU-D41
8.2
More than one HLU-D41 may be installed in a channel bank. The physical time slots are identical to
the electrical DS0 time slots in D4 banks. Physical slots match the DS0 time slots as shown in Table
6. Depending on the slot position of the HLU-D41 and its bandwidth, certain channel bank slot
positions will not be available for use by other line units.
Table 6. Channel Bank Slot Positions
Physically Installed
Channel Slot
Number of Provisioned
Time Slots
Next Available DS0
Time Slot
1
8
9
12
6
18
20
4
24
20
6
not recommended
The last example in Table 6 is not recommended because its bandwidth exceeds the
24-slot single digroup limit. This would require the HLU-D41 to wrap around and
add time slots 1 and 2 to 20 through 24. Most channel banks have a gaped clock
which prohibits this wrap feature.
8.3
Mode III Operation.
The HLU-D41 can be used in SLC-96 banks configured for Mode III (special
service) operation. Since SLC-96 channel slots do not receive signaling frame information, SLC-96
HLU-D41 applications cannot be configured for RBS and are restricted to the CLR signaling option.
Table 7 shows the relationship between the physical and DS0 time slots for various settings of Band
and Slot for the two SLC-96 channel counting options. In addition, Mode III has two channel
counting sequences, such that the physical channel slots are not identical to the DS0 time slots. The
Mode III D1D and D4 channel counting sequences are shown in Table 8.
Table 7. Relationship Between Physical Slots and Timeslots in SLC-96 Banks
Timing
mode
Band
Slot*
Physical
slot
DS0 time slots
Blocked physical slots
DID
768K
CONT
3
11, 12, 13, 14, 15...22
3, 9, 16, 22, 4, 10, 17, 23, 5,
11, 18, 24
DID
256K
ALT
16
13, 15, 17, 19
16, 4, 17, 5
D4
768K
CONT
5
9, 10, 11...20
5, 17, 6, 18, 7, 19, 8, 20, 9, 21,
10, 22
D4
256K
ALT
18
18, 20, 22, 24
21, 22, 23, 24
* CONT=Contiguous slot setting
ALT=Alternating slot setting
See Section 12 if configuring timeslots using the front panel Mode and Choice Setup buttons, or Section
18.9 if configuring timeslots using the Maintenance Terminal menus.
