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National bit selection sw1 -4, National bit selection sw1 – Verilink PRISM 3021 (34-00262) Product Manual User Manual

Page 12

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2-4 Installation

PRISM 3021

B

OOT

M

ODE

Position S3-5 and S3-6 select the boot mode as shown in
Table 2-J.

DTE R

ATE

M

ULTIPLIER

Position S3-7 is used to select the DTE rate multiplier as
shown in Table 2 -K. The switch is used in conjunction with
switch S4 to determine the DTE rate.

C

HANNEL

A

SSIGNMENT

Position S3-8 selects the channel assignment mode as shown in
Table 2-L for network E1 DS0s that carry data to the high-speed
port. Contiguous channel mode assigns the channels as a block
beginning at channel one. For example, if the high-speed port data
rate is 256 kbps (as shown in Table 2-N on page 2-5), the unit
would assign network channels 1 through 4 to the high-speed port.

Alternate channel mode assigns an idle channel following
each data channel. Using the example above, data is carried
on channels 1, 3, 5, and 7 while channels 2, 4, 6, and 8 are
set idle (binary code 01111111). The advantage of alternate
channel assignment is that E1 ones-density requirements are
maintained by the idle channels rather than placing any
restriction on the high-speed data.

National Bit Selection SW1

SW1 is located as shown in Figure 2-5 and is used to
choose a national bit to create a 4-kbps datalink between the

endpoint units. Both endpoint units must have the same
national bit selected to utilize the datalink. The national bit
is selected as shown in Table 2-M.

Table 2 -J Boot Mode

Mode

S3-5

S3-6

Switches

Down

Down

RAM

Down

Up

ROM

Up

Down

Reserved for future expansion.

Up

Up

Table 2-K DTE Rate Multiplier

DTE Rate Multiplier

S3-7

N

×

64

Down

N

×

56

Up

Table 2-L Channel Assignment

Channel Assignment

S3-8

Contiguous

Down

Alternating

Up

Figure 2-5 B

OTTOM

-E

DGE

V

IEW

OF

P

RISM

3021

Switch S1

1

8

7

6

5

4

3

2

Switch SW1

0

1

2 3 4

5

6

78

9

(E1-DTE Option Card)

Table 2-M National Bit

National Bit

Switch Position

None

0

SA4

1

SA5

2

SA6

3

SA7

4

SA8

5

None

6-9