Zhone Technologies 900 - Manual (Page 72)

2-6 IMACS System Release 5.1.6 Data Cards
Model No. Running Head SRU Card User Screens and Settings SRU Card
STATE
The State setting determines whether the port is active or inactive. Set this field to stdby
(standby) for ports that are not to be used or that have not yet been configured. Set it to actv
(active) for ports that are ready for use. The control leads assume the status shown in Table
2-3 for the different states.
Table 2-3. SRU Card State Status
WAN
The WAN setting identifies the WAN link assigned to this port. It is not necessary for ports on
the same card to be assigned to the same WAN link, or to contiguous time slots on a WAN link
(see the restriction in the TS field below).
TS
The Time Slot setting identifies the time slot on the WAN link to which this port is connected.
Values range from 01 to 24 for T1 links and 01 to 31 (excluding time slot 16 when CCS or
CAS is used) for E1 links. The SRU card can further subdivide the WAN time slot into smaller
segments for transmission of low-speed data. Each WAN time slot can be further divided into
a maximum of twenty 2.4 kbps time slots (see Figure 2-4).
The only restriction to assigning WAN time slots is that the same time slot number on different
WANs cannot be used for subrate data ports on the same SRU card. For example, if you assign
time slot 1 on WAN 1-1 to one port on an individual card, you cannot assign time slot 1 on any
other WAN link to other ports on the same card.
FRAME
The Frame setting allows you to define the sub-rate format that the port will use and to set the
usable space allotted to each WAN time slot. The choices are DS0A (a) for one subrate time
slot, DS0B with a limit of five subrate time slots (b-5), DS0B with a limit of ten subrate time
slots (b-10), and DS0B with a limit of twenty subrate time slots (b-20). Figure 2-4 shows the
DS0A and DS0B framing subrate time slot interaction. In a b-20 frame, two or more SRU
cards can be configured to occupy the same WAN time slot. These options are available with
the SRU 232*10 (822060), SRU 232*10 C&D Bus (822160).
Additional choices with the SRU 232*10 (822060), SRU 232*10 C&D Bus (822160), cards
include: x.50 (an ITU standard), nlink (used to transmit clock to related units) (Note: the
RATE and INTF will change when nlink is chosen), adpcm (used to multiplex subrate data
Control Leads Active WAN Link Down Standby
RLSD High or follows remote RTS Low Low
CTS Definable Definable Low