Verilink 1544N Installation Guide

TRANSPORT

1234567

SW1

®

1544N D4 CSU

Configuration Guide

M

Part Number 45-00016

Rev 1.01

N

O

®

TRANSPORT

NETWORK

INTERFACE

1544

T1 CSU

POWER

BPV

1

AIS

ALL 0’s

LOOP

DENSITY

SET

RESET

ERROR

M

N

O

TEST

NTWK

NORMAL

13128 9 10 11765432

Front Panel Description

1 Brackets: Use the 2 holes on each bracket to bolt the 1544N to the rack mount kit or wall.
2 Switch SW1: This 7-position configuration switch is detailed on the reverse side of this guide.
3 POWER: This green LED lights whenever power is applied to the 1544N.
4 BPV: This red LED lights (0.1 seconds minimum) for each occurrence of bipolar violations (BPV).
5 ALL 0s: This red LED lights if no signal is detected from the network.
6 AIS: This red LED lights if an unframed all ones signal (alarm indication signal) is detected from the network or DTE.
7 LOOP: This yellow LED lights to indicate that the unit is in the Line Loopback condition.
8 DENSITY: This red LED lights if the ones density of the received data from the DTE is less than 12.5%.

9 SET: This red LED flashes when the set code is transmitted. It lights constantly if the set code is received.
10 RESET: This red LED flashes when the reset code is transmitted. It lights for 5 seconds if the reset code is received.
11 ERROR: This red LED flashes if an error is received during a network test.
12 Te s t J ac k s: These bantam jacks provide access t o the T1 line on the DTE sid e. The jacks allow transmit and rec eive toward the net-

work, toward the DTE, or monitoring of traffic between the DTE and the network. Refer to the description below.

13 Test Switch: This is a 3-position rocker switch used for performing a network test or a local loopback. Refer to the description below.

DTE

LOOP

LOCAL

Test Jacks (12) Test Switch (13)

TOP: The top 2 jack access ports break connecti on to the DTE
and make connection to the CSU in the direction of the network.

MIDDLE: The middle 2 ports are used for monitoring the sig­nals passing through the CSU (between the DTE and the net­work).

BOTTOM: The bottom 2 ports break connection to the CSU and
make connection to the DTE.

Receive signal

from the network

Monitor signal

from the network

Transmit signal

to the DTE

Transmit signal

to the network

Monitor signal

from the DTE

Receive signal

from the DTE

NETWORK TEST: When depressed, the CSU loop code is trans­mitted for 5 seconds.

NORMAL: When moved from NTWK TEST back to NORMAL,
the CSU sends a loop do wn code. When moved from LOCAL LOOP
back to NORMAL, the local loop back is removed.

LOCAL LOOP: When depressed, t he C SU pe rfor ms a loca l, bi di­rectional loop.

NTWK

TEST

NORMAL

LOCAL

LOOP

DTE NET

1544N Rear P anel

1

8

LBO

NETWORK

0 dB

15 dB

7.5 dB

LBO Level

Sets the output signal level of transmitted data.
The Telco should provide the proper setting. If
unsure of the exact setting, set to 0 dB.

Option Switch SW1 (front panel)

Keep Alive - All Ones

Keep Alive - Unframed

Test Mode - BERT

Bipolar Violations - B8ZS

Test Pattern - Framed

Zeros - 15

Sealing Current - Off

7654321

RightLeft

TO

Keep Alive - Loop Back

Keep Alive - Framed

Test Mode - Clear

Bipolar Violations - AMI

Test Pattern - Unframed

Zeros - 50

Sealing Current - On

NETWORK

FROM

NETWORK

GROUND

-48 VDC

–

NOTE

+

TB1

: If the terminal block is to be used for DTE con-

1

DTE

DTETODTE

FROM

POWER

nection, the dummy plug must b e inserted into the DTE
jack. When the plug is removed, the unit is looped towar d
the network. There is no loop toward the DTE.

NET / DTE Interface

Pin DTE

(RJ48X)

1 Data Out Data In
2 Data Out Data In
3 Not used Not used
4 Data In Data Out
5 Data In Data Out
6 Not used Not used

7/8 Ground Ground

NET

(RJ48C)

8

: This unit is factory preset for normal operation. All factory default settings are shown under-

NOTE

lined. The unit may be installed a nd operated with out a ny fu rther a djus tment. If yo ur part icul ar setti ng
requir ements ar e dif fer ent, then mark the box which corr esponds to your selection (for futur e r efer ence).

Switch SW1 Description (front panel)

S1 Sealing Current: OFF is used where the Telco provides line power or where sealing current is not

required. ON applies sealing current to a dry (no power) Telco interface. Wa rning: enabling sealing
current with Telco line power present could damage the unit and/or cause improper operation.

S2 Zeros: 15

50 allows 50 zeros before Keep Alive is activated.

S3 Test Pattern: FRAMED indicates that the test signals (Set, Reset, and BERT) are framed.

UNFRAMED indicates that the test signals (Set, Reset, and BERT) are unframed.

S4 Bipo lar Violat io ns : AMI indicates a BPV error for each B8ZS event (if B8ZS coding is being used on

the network). B8ZS allows the CSU to be transparent to a B8ZS code coming from the network.

S5 Test M od e : CLEAR allows access to the network via test jack s to run bit error tests (effects network

tests only). BER T allows the CSU to send a bit error rate test pattern after the set signal (LOOP) is sent.

S6 Keep Alive: UNFRAMED transmits the Keep Alive signal without framing.

FRAMED adds framing information to the Keep Alive signal.

S7 Keep Alive: ALL ONES sends a consecutive sequence of all ‘1s’ back to the network.

LINE LOOP BACK sends any signal coming from the ne twork back to the network.

allows 15 successive zeros from the DTE before the Keep Alive mode is activated.

TRANSPORT

TxPORT

127 Jetplex Circle

Madison, Alabama 35758

Customer Service

800-926-0085, ext. 227

Product Technical Support

(8 a.m. to 5 p.m. Central)

205-772-3770, ext. 255
800-285-2755, ext. 255

Emergency After Hours

Support: 205-603-2193

Manager: 205 -603-2194

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