The Subchannel-Definition is
for the Z7300A 4-Channel E1/T1 interface only. In the Subchannel-Definition section, a
subchannel entry must be defined for all subchannels that are referenced/configured
by the X.25/9000 product. Each port has a fixed number of timeslots
available. For E1, there are 31 timeslots (labeled 1-31) where each
timeslot has a bandwidth of 64K bits per second (bps). For T1, there
are 24 timeslots available (labeled 1-24) with each timeslot having
a bandwidth of 56K bps.
The subch statement is used to associate one or more timeslots
with a specific subchannel number of your choosing. Each timeslot
number may only be used once on any given port. The bandwidth of
the subchannel is equal to the bandwidth of the timeslot times the
number of timeslots assigned to the subchannel. For example, you
could define 3 T1 subchannels (1-3) with timeslots #1-8, 9-16, and
17-24. Each subchannel would have a maximum throughput of 448K bps
in each direction.
Required parameters must be specified in the order shown.
Optional parameters are specified with key-words.
Subch in:p:sc tmode ITBS=n INV=ON/OFF ts:sn:fm
|
 |
Subch |
|
The only valid subheading for the Subchannel-Definition section.
Each subchannel must be defined as a separate record commencing
with the subheading "Subch".
in | Interface card number (defined
in the Interface-Definition section.) |
p | Port number in E1/T1 interface
card (0 - 3) |
sc | Subchannel number within
a port (1 - 31). You may pick any arbitrary number within the range
listed. |
tmode | Transmission mode:
TRANSA
TRANSB
V.110
HDLC |
Transparent mode A
Transparent
mode B or R
V.110/X.30 mode
HDLC mode
|
ITBS=n | Individual Transmit Buffer Size; where “ITBS” is
the key-word and “n” is the input size. For undisturbed
transmission an on-chip transmit buffer with a total size of 64
long words stores the data before formatting and transmitting. The
individual buffer size specifies the part of the on-chip transmit
buffer allocated to the channel. |
| As a general rule ITBS should be set
to 2 X [number of timeslots assigned to subchannel]. Note that if
all timeslots are assigned, the maximum value is 63. |
INV=
ON/OFF | Inversion; where “INV” is
the key-word, “ON” sets inversion, and “OFF” unsets
it. If INV=ON, all data of the channel transmitted or received by
the subchannel is inverted. |
ts:sn:fn | Set timeslot assignment; where “ts” is
the key-word for timeslot. The first “:” commences
the transmit/receive timeslot number. The second “:” commences
the transmit/receive fill mask. For example:
ts:2:ffh
where 2 is the transmit/receive timeslot
number and ffh is the hex value of the transmit/receive fill mask. |
Subch 0:1:2 HDLC ITBS=2 INV=OFF ts:1:ffh |
or
Subch 0:1:4 HDLC ITBS=4 INV=OFF ts:3:ffh
|
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