Verilink PRISM 3021 (34-00262) Product Manual Uživatelský manuál stáhnout pdf (Strana 10)

2-2 Installation

PRISM 3021

Configuration Switch S1

Switch S1 (Figure 2-2) is used to set the configuration

parameters listed in the following paragraphs.

Factory default settings are underlined

through-

out this manual.

ETWORK

RAMING

Position S1-1 is used to select Channel Associated Signaling

(CAS) network framing or Common Channel Signaling

(CCS) network framing as shown in Table 2-A.

CRC4 M

ODE

Position S1-2 is used to enable or disable CRC4 as shown in

Table 2 - B.

ETWORK

INE

ODE

Position S1-3 selects High-Density Bipolar of order 3

(HDB3) line code or Alternate Mark Inversion (AMI) line

code as shown in Table 2-C. HDB3 provides clear channel

capability.

IMING

OURCE

Positions S1-4 and S1-5 are used to select the source of unit

clocking as shown in Table 2-D. Deriving timing from the

network is the most common timing source for most applica-

tions. The unit may also be clocked from its internal oscilla-

tor; from equipment attached to the DTE; or from equipment

attached to the E1-DTE option card.

EEP

LIVE

RAMED

AND

NFRAMED

NES

Position S1-6 selects keep alive framed and unframed ones

as shown in Table 2-E. Keep alive is generated when the

unit detects LOS or OOF.

Table 2-A Network Framing

Functions S1-1

Network Framing CAS

Down

Network Framing CCS Up

Table 2-B CRC4 Mode

Functions S1-2

CRC4 enabled

Down

CRC4 disabled Up

Switch S1

234567

Switch S2

234567

Switch S3

234567

Switch S4

51234

Figure 2-1 Top-Edge View of the PRISM 3021

7654321

Down Up

Network

CRC4

Network

Data Normal

Program

Framing

Mode

Flash

or Inverted

Keep Alive Framed

and Unframed Ones

Line Code

Timing

Source

Timing

Source

Figure 2-2 Switch S1

Table 2-C Network Line Code

Network Line Code S1-3

HDB3

Down

AMI Up

Table 2-D Timing Source

Timing Source S1-4 S1-5

Network

Down Down

Internal Down Up

E1 DTE Up Down

DTE or External Up Up

Table 2-E Keep Alive Framed and Unframed Ones

Mode S1-6

Keep Alive Unframed Ones

Down

Keep Alive Framed Ones Up

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 46 47

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