CTC Union TRM01 User Manual

Table of Contents

i

Chapter 1. Introduction …………………………………………... 1

1.1 General …………………………………………………….. 1

1.2 Functional Description ……………………………………. 1

1.3 Technical Specifications …………………………………... 3

1.4 T1 Signal Structure ……………………………………….. 4

1.5 Applications / Capabilities ………………………………… 6

Chapter 2. Installation ……………………………………………. 9

2.1 General …………………………………………………….. 9

2.2 Site Preparation …………………………………………… 9

2.3 Mechanical Assembly ……………………………………... 9

2.4 Electrical Installation ……………………………………… 10

2.5 Power Supply Modules …………………………………… 12

Chapter 3. Data Modules ………………………………………… 13

3.1 Data Modules Overview …………………………………... 13

3.2 Data Module LED Indicators …………………………….. 16

3.3 V.35 Data Module …………………………………………. 17

3.4 RS-530 Data Module ……………………………………… 18

3.5 RS-449 Data Module ……………………………………… 19

3.6 X.21 Data Module …………………………………………. 20

3.7 ET10 Ethernet Module ……………………………………. 21

Table of Contents

ii

Chapter 4. Loop Back Testing …………………………………... 23

4.1 General ……………………………………………………... 23

4.2 User Activate Loop Back …………………………………. 23

4.3 T1 Link local digital loop back ……..…………….………. 23

4.4 Data Port local analog loop back ……………….………… 24

4.5 T1 Link remote loop back ………………………………… 24

4.6 BERT local loop back ……………...……………………… 25

4.7 BERT remote loop back for system test .………………… 25

Chapter 5. Troubleshooting ……………………………………… 27

5.1 General …………………………………………………….. 27

5.2 Connections .……………………………………………….. 27

5.3 Configuration ..…………………………………………….. 28

5.4 FT1 Card testing .………………………………………….. 29

Appendix A. DIP Switch Setting Tables ………………………. 33

Notes: …………………………………………………………………. 39

Technical Inquiry Card

Chapter 1. Introduction

1 TRM-01 APR 2000

1.1 General

The TRM-01 is a 4U (7") high 19" Rack, containing multiple T1

CSU/DSUs for Fractional T1 network access. The TRM-01 provides an

economic solution in high density T1 installations such as central offices. There

are 13 slots available for installation of FT1 Cards (G.703 Fractional T1) into

the TRM-01 compact RACK. An optional SNMP Card may be installed into

the last slot, for local and remote management purposes, leaving 12 slots

available for FT1 Cards. Each FT1 Card may be linked to a remote TTU-01

or TTU-01A stand alone T1 CSU/DSU Access Unit to provide a variety of

LAN-to-LAN, Video Conference, Host to client, or Host to Host applications

over T1 Network Services.

1.2 Functional Description

The TRM-01 may optionally incorporate two separate Power Module

supplies, which, depending on the model, may derive power from either an AC

power source (95~250VAC) or DC (-54 to -42VDC) power source. The power

supply modules provide for power redundancy and are hot swappable even

during the FT1 Cards' transmissions. The TRM-01 provides all interface

connections on the rear panel. BNC and Terminal Blocks are used for T1 Line

interface connections, while optional cable adapters are used to convert the

HDB26 DCE ports to V.35, RS-530, RS-449 or X.21. When an FT1/ET10

Card (Ethernet bridge interface) is installed in the TRM-01, the card can

provide either Ethernet bridging or repeating (non-filter mode) over the T1 link.

When cards are inserted in slots, LEDs on the front panel will show both the T1

Line and Data port statuses, Power Status, and any Alarm indications.

The FT1 Card data channels support user-selectable transmission rates,

which are integer multiples of 56Kbps or 64Kbps (fractional T1), up to a

maximum 2048Kbps (unframed T1), for a line attenuation of up to 43 dB on

twisted pair or coax cables. This provides an approximate operating range of up

to 2Km (over 22AWG wire).

The FT1 Card packs its data channel into user selected T1 link time slots.

The unused time slots may have IDLE code of 0xff or 0x7e inserted (in frame

mode) or they may insert the receive side time slot's data (In cascade mode).

The TRM-01 has three major types of FT1 Card data port interface

modules, which provide the desired interface: V.35, RS-530, or ET10 Ethernet.

X.21 and RS-449 interfaces are fully supported using the RS-530 (public) card

and appropriate X.21 and RS-449 adapter cables.

Chapter 1. Introduction

2 TRM-01 APR 2000

The TRM-01 and FT1 Cards fully meet all T1 specifications including

ITU-T G.703, G.704, G.706, G.732, and G.823.

Each FT1 Card features V.54 diagnostic capabilities for performing local

loop back and remote loop back. The operator at either end of the T1 line may

test both the FT1 Card and the line in the digital loop back mode. The loop

back is controlled by either a manual push-button switch or by the DTE

interface for V.35 or RS-530.

When the local loop back switch is activated, an internal 511 bit pseudo

random test pattern is generated, according to ITU-T, for direct end-to-end

integrity testing. The Err indicator LED flashes for each bit error detected.

Multiple clock source selection provides maximum flexibility in

connecting both the T1 and user data interface. The T1 link may be clocked

from the recovered receive clock, from user data port, or from an on-card

oscillator.

When the TRM-01 is ordered with an optional SNMP Card, the card is

placed in slot number 13. Each FT1 Card will have DIP Sw7-6 turned ON to

enable remote setting. In this mode, the other DIP switch settings are ignored

while the SNMP Card controls all settings (with the exception of termination

impedance). Control is accomplished either via local control on the

asynchronous RS-232 port with an ASCII terminal or via Ethernet and any

standard SNMP network management software. If the SNMP Card option is

not installed, slot number 13 may hold an additional FT1 Card.

Figure 1-1 : TRM-01 Block Diagram

Chapter 1. Introduction

3 TRM-01 APR 2000

1.3 Technical Specifications

T1 Link User Data Channels

• Framing

Unframed/Framed V.35
D4(SF) RS-530
ESF RS-449
X.21

• Bit Rate

1.544Mbps

• Interface Type

Ethernet 10Base-T

AMI

• I/F Connectors

HDB26 female

• Line Code

B8ZS

100 Ω

• Line Code

NRZ (except
Ethernet)

• Line

Impedance

Balanced

• Receive Level

0 to –36dB

Transmit Level

• Data Rate

1536Kbps(unframe)
nx56 or nx64Kbps
where N equal
1 ~24

Clock Modes Pulse

amplitude

3.00V ±10% (100Ω)

Mode 0
(DCT1)

Rx and Tx clock
recovered from T1

Zero
amplitude

±0.1V

• Transmit Frequency Tracking

Mode 1
(DCE2)

Rx and Tx clock
internal oscillator

Internal
timing

±30ppm

Mode 2
(DTT1)

Sync to Rx clock

(transparent)
Loopback
timing

±50ppm

Mode 3

(DTE2)

Tx from ETC and

Rx from ERC
External
timing

±100ppm

Mode 4
(DTE3)

Tx and Rx both

from ETC

• Jitter

performance

According to ITU-T
G.824

CTS constantly ON

• Complies with

ITU-T G.703,G.704,
G.706,G.733,G824
and ANSI T1 403

DSR constantly ON

except during test

BNC for unbalanced

• I/F connectors

5 pin Molex ™ for
balanced

• Handshaking

control signals

DCD constantly ON

(except during

signal loss)

• Timeslot

Allocation

User Defined

Table 1-1 : TRM-01 Specifications

Chapter 1. Introduction

4 TRM-01 APR 2000

1.4 T1 Signal Structure

The T1 line operates at a nominal rate of 1.544Mbps. The data transferred

over the T1 line is organized into frames, with each T1 frame containing 256

bits. The 256 bits are a total of the 24 time slots, each containing eight bits, that

carry the data payload.

T1 transmission utilizes two main types of framing: Superframe Format

(SF) and Extended Superframe Format (ESF). A T1 framing format that uses

the framing bit to provide maintenance and diagnostic functions. D4-frame - A

T1 line uses the D4 format, also known as the superframe (SF) format, to frame

data at the physical layer. The D4 format consists of 12 consecutive frames,

each separated by framing bits. Framing is necessary in order for equipment

receiving the T1 signal to be able to identify and extract the individual channels.

Superframe Format (SF)

SF - Also known as D4, T1 lines use this format to frame data at the

physical layer. The SF format consists of 12 consecutive frames, each separated

by framing bits.

Extended Superframe Format (ESF)

ESF is a framing format that consists of 24 consecutive frames separated

by framing bits. The ISDN specification advises that you use ESF with ISDN

D-channel signaling.

T1 line signal

The basic T1 line signal is coded using either the Alternate Mark

Inversion (AMI) or B8SZ rule.

Chapter 1. Introduction

5 TRM-01 APR 2000

In the AMI format, “ones” are alternately transmitted as positive and

negative pulses, whereas “zeros” are transmitted as a zero voltage level. AMI is

not used in most 1.544Mbps transmissions because synchronization loss occurs

during long strings of data zeros.

B8ZS: Abbreviation for bipolar with eight-zero substitution . A T-carrier

line code in which bipolar violations are deliberately inserted if user data

contains a string of 8 or more consecutive zeros. Note 1: B8ZS is used to ensure

a sufficient number of transitions to maintain system synchronization when the

user data stream contains an insufficient number of "ones" to do so. Note 2:

B8ZS is used in the European hierarchy at the T1 rate.

T1 link line coding

The TRM-01 supports two T1 line codes:

AMI coding.

B8ZS coding.

T1 framing formats

The TRM-01 supports three frame formats:

Unframed format.

SF Superframe Format.

ESF Extended Superframe Format.

Chapter 1. Introduction

6 TRM-01 APR 2000

1.5 Applications / Capabilities

In the following example, the TRM-01 is installed at an ISP's central

office and provides "last mile" access to corporate customers over dedicated T1

transmission lines. The customer site utilizes a single data port CSU/DSU,

which could be one of our pack series or standalone units. While utilizing

fraction T1 connections, the ISP can provide a variety of bandwidth options to

its customers. By varying timeslot assignments, data rates from 64Kbps up to

1536Kbps may be utilized in frame mode.

The FT1 Cards in the TRM-01 could all be set to internal oscillator

timing or they could receive timing from the DTE on the data port. The remote

units would all be set to recovery.

Figure 1-2 : T1 nest for ISP

In the next application example, the TRM-01 is used in a point-to-point

T1 line environment. Each FT1 Card acts as a stand alone Digital Access Unit,

connecting individual T1 lines to data port interfaces or bridging Ethernet LANs.

For any T1 link, one CSU/DSU should provide internal timing while the linked

unit should be set to recovery.

Figure 1-3 : Point-to-point Application of TRM-01

Chapter 1. Introduction

7 TRM-01 APR 2000

The next example utilizes the cascade capability of the FT1 Cards. In this

example, multiple FT1 Cards are set to “cascade”. Each card is assigned non-

overlapping timeslots of a single T1 line. In cascade mode, the FT1 Card

passes unused timeslot data transparently from Rx to Tx, creating a multiplexer

effect. By careful assignment of timeslots in the T1 frame, the TRM-01 could

be used as a 13 data channel multiplexer. It should also be noted however, that

removal or failure of any one card in this configuration would negatively effect

all other card data throughput.

Figure 1-4 : Multiplexer function (cascade mode) over T1 services

In the last application example, the TRM-01’s FT1 Cards provide

multiple data port connections via T1 lines connected through an T3 multiplexer

from an T3 line. Since the timing is normally passed from the network side, the

FT1 Cards should all be set to recovery.

Figure 1-5 : Multiple T1 Access via E3 multiplexer

Chapter 1. Introduction

8 TRM-01 APR 2000

This page left blank intentionally.

Chapter 2. Installation

9 TRM-01 APR 2000

2.1 General

This chapter explains in detail the requirements and procedures for the

installation of the TRM-01 Rack Mount Series T1 Digital Access Unit.

2.2 Site Preparation

Install the TRM-01 within reach of an easily accessible grounded AC

outlet. The outlet should be capable of furnishing 90 to 250 VAC. Allow at least

10cm (4 inch) clearance at the rear of the TRM-01 for signal lines and interface

cables.

2.3 Mechanical Assembly

The TRM-01 is designed for rack mount installation and only requires 4U

space (7") in a standard EIA 19 inch rack. It is highly recommended that the

unit be placed in a rack. The TRM-01 is delivered completely assembled. No

provision is made for bolting the TRM-01 to a tabletop.

Figure 2-1 : Rackmount Installation of the TRM-01 Unit

Chapter 2. Installation

10 TRM-01 APR 2000

2.4 Electrical Installation

2-4-1. Power connection

In the AC model, AC power is supplied to the TRM-01 through a standard

IEC 3-prong receptacle, located on the rear of the chassis. In the DC model,

DC –48V is connected to the lower terminal block, observing the proper

polarity. The TRM-01 should always be grounded through the protective earth

lead of the power cable in AC installations, or via the ground connection for DC

installations.

The line fuses for the TRM-01 are located on the Power Module units

themselves. Access to the fuses requires removal of the Power Module card.

The fuse, a 20mm type, is located in the fuse holder labeled "F1". Make sure

that only fuses of the same rating are used for replacement. Do not use repaired

fuses or short-circuit the fuse holder.

Figure 2-2 : Fuse Location on AC Power Module

Line
Fuse

Holder

Location

Power

Module

(one or two)

Mains

Switch

in back

TRM-01

Chassis

Chapter 2. Installation

11 TRM-01 APR 2000

2-4-2. Rear panel connectors

The FT1 Cards install into the front of the TRM-01 and receive DC

power from the back plane or “main board”. The back plane provides both DC

power to the T1 Cards and routes signals from the cards to the T1 (CSU) and

data port (DSU) connectors accessible at the rear of the TRM-01. Three

interface connector groups are provided for each slot. The T1 signals may use

either the Rx/Tx BNC pair for unbalanced transmissions or the 5pin Molex

connectors with terminal block adapters for balanced transmissions. The data

port connections are made with optional adapter cables, using a common panel

connector, HDB26F for all interfaces.

Figure 2-3 : TRM-01 Rear Panel Connections

HDB26F Data Port

T1 unbalanced BNCs

T1 balanced Molex

HDB26F to RJ-45

(

for FT1/ET10)

Molex to terminal

post adapter

Alarm Relay Contacts

Mains Switch

IEC AC Mains Input

Chapter 2. Installation

12 TRM-01 APR 2000

2.5 Power Supply Modules

The Power Supply Modules in the TRM-01 are available in two

versions, AC or DC. The AC version supports input voltages of 90 to 250 volts

at frequencies of 50 to 60 Hertz. The DC version supports –42 to -54VDC input

voltage. Only one power supply module is required to power a completely full

rack. When two Power Supply Modules are installed, the supplies are hot

swappable, meaning any one supply may be removed and replaced without

impacting the operation of the TRM-01 Rack.

When an AC Power Module is used in the TRM-01, AC power enters

from the IEC mains input connector on the rear panel. AC power is supplied to

the AC Power Module card(s) when the mains toggle switch is closed. The AC

passes through the F1 fuse(s), located on the Power Module card(s). The AC

power is rectified and filtered before being passed to the regulator module. The

regulator module is factory adjusted to provide 48VDC to the back plane with

complete regulation and over-voltage, over-current, and over-temperature

protection.

When a DC Power Module is used in the TRM-01, DC –48V enters from

the terminal block on the rear panel (see Figure 2-4). DC power is supplied to

the DC Power Module card(s) when the mains toggle switch is closed. The DC

passes through the F1 fuse(s), located on the Power Module card(s). The DC

power passes through the rectifier and filtering circuits, which provide reverse

polarity protection before being passed to the DC-DC regulator module. The

regulator module is factory adjusted to provide 48VDC to the back plane with

complete regulation and over-voltage, over-current, and over-temperature

protection.

Figure 2-4 : DC Model Power Connection

3-pole terminal block

for –48VDC Input

plus Frame Ground

Mains Switch

Chapter 3. Data Modules

13 TRM-01 APR 2000

3.1 Data Module Overview

The Data Modules for the TRM-01 are FT1 (fractional T1) Cards which

slide into the TRM-01 chassis, and interface with the pack panel “main board”.

The back panel provides an interface connection to the FT1 cards for power,

T1 connection, data port connection and control logic (for optional SNMP/local

management terminal). The cards are designed to be “hot” swappable, meaning

the TRM-01 chassis need not be powered off in order to replace a card or pull it

for configuration setting. Each FT1 Card has a protection fuse and its own on

card DC-DC regulator. Each FT1 Card in the TRM-01 receives the DC buss

48VDC and uses its own on-card DC to DC converter to derive the required

operating voltage of 5VDC. Removal and installation of FT1 cards with the

rack chassis under power will not effect the operation of other FT1 cards. The

one exception to this would be a case where the improper fuse (rated too high)

were placed on a defective FT1 card, causing the main AC or DC power

module's fuse(s) to open. It should also be noted, that the FT1 cards themselves

have no redundancy. Therefore, if a card is pulled from the chassis while the

communication link is active, the link will be broken.

Removal of an FT1 Card is accomplished by loosing the two (2) captive

screws on the face plate of the card module, and then pulling the card straight

out of the chassis with the same screws. Apply equal pulling force to both top

and bottom captive screws to avoid the card binding in the rails of the chassis.

(refer to Figure 3-1) Replace the card by reversing the procedure, align in the

slot groove and gently seat the card. Retighten the captive screws.

Figure 3-1 : Removal/Replacement of FT1 Card in TRM-01 Chassis

Captive

Screws

TRM-01

Chassis

Card
Rails

Interface

Connector

FT1 Card

Configuration

DIP Switches

Chapter 3. Data Modules

14 TRM-01 APR 2000

Figure 3-2 : FT1 Card Detail

Push button

switches

for Test

Loop Back

Power, Status

and

Alarm LEDs

9

Interface

Connector

DC-DC

Converter

Power

Protection

Fuse

Configuration DIP Switches

Hardware Version, I/F Type

Chapter 3. Data Modules

15 TRM-01 APR 2000

The FT1 Card in the TRM-01 uses a common bare PC board. During

production, the card assembly is outfitted with the required interface circuitry

and firmware for a particular interface type. A check mark is placed in the box

as noted in the previous figure (shown with V.35 checked). The appropriate

interface adapter cable is then necessary for proper functioning. Care must

always be taken when swapping boards. Always check and match the correct

type. The three board types are RS-530 (public), V.35 and ET10 (Ethernet).

X.21 and RS-449 interfaces are fully supported by adapter cable paired to the

RS-530 (public) card.

There are seven (7) DIP (Dual Inline Package) Switches located along the

top of the FT1 Card numbered DIPSW1~7. The switches functions are to set

the T1 line connection impedance, frame mode, Time Slot allocation, clock

mode, line code, CRC, idle code, and data channel interface rate. Please refer to

Appendix A for the setting tables.

Located on the upper half of the front panel are the indicator LEDs. There

is a green power indicator which will light when the card is placed in an active

chassis. Failure of this LED to light indicates a possible power failure on the

FT1 Card itself. The TD, RD, RTS, and DCD yellow LEDs indicate status of

the data communication port. The red TxCLK, signal loss, sync loss and alarm

LEDs all indicate error conditions on the T1 line or link connection. When loop

back testing is being performed, the red test LED will light. If any bits are

received in error, the red err LED will flash.

Located on the lower half of the front panel are the manual test switches.

The top three switches set the type of loop back test to be performed. The

bottom switch enables the internal pattern generator. The Loc dig loopbk (local

digital loop back) switch tests the performance of the local FT1 Card, the

remote unit and the connections between by looping back the T1 received data

to the remote unit. The Loc ana loopbk (local analog loop back) switch tests the

performance of the local FT1 Card, the data terminal device and the

connections between by looping back the received terminal’s data back to the

terminal. The Rem loopbk (remote digital loop back) switch tests the

performance of the local and remote units, as well as the line, by issuing a

proprietary loop back command to the remote CSU/DSU. In order to perform

remote loop back, the FT1 Card must not be in unframed mode. When the

Pattern switch is depressed, the local FT1 Card sends out a 511-bit test pattern

(according to ITU-T V.54) on the T1 link, enabling testing of the entire link.

Refer to Chapter 4 for detailed diagrams of the loop back functions of the TRM-

01’s FT1 Card.

Chapter 3. Data Modules

16 TRM-01 APR 2000

3.2 Data Module LED Indicators

PWR: This green LED should be lit when the chassis is
powered and the FT1 Card is seated in the rack slot.

TD: This yellow LED will flash when there is transmit data
activity from the connected DTE equipment to the FT1 Card.

RD: This yellow LED will flash when there is receive data
activity from the FT1 Card to the connected DTE equipment.

RTS: This yellow LED will be lit when the Request To Send
signal is active on the data port.

DCD: This yellow LED will be lit when the carrier signal is
active between the DSU and the connected DTE equipment.

TxCLK Loss: This red LED will light in the event of CSU
clock signal loss.

Sig Loss: This red LED will light in the event of CSU signal
loss.

Alarm: This red LED will light in the event of the following
alarm conditions: Remote Alarm Indication (RAI), Bi-Polar
Violation (BPV) error, All ones (AIS), CRC4 error, or Frame
Slip.

Err: This red LED will flash upon receiving an error while in
BERT mode (pattern depressed and looped back).

Test: This red LED will light if any of the test pushbuttons are
depressed or if the FT1 Card is in analog loop back due to
reception of a V.54 remote loop back code from the remote unit.

Figure 3-3 : FT1 Card face (RS530 public
card for RS-530, X.21, or RS-449)

Chapter 3. Data Modules

17 TRM-01 APR 2000

3.3 V.35 Data Module

When the TRM-01 is ordered with an TRM01/V35 option, an FT1/V35

card is supplied and an optional V.35 adapter cable may be ordered or

assembled according to the following table. The adapter cable follows the pin

out standards shown below exactly.

Abbreviation HDB26

PIN#

MB34

PIN#

V.35

Circuit

FG 1 ↔ A Frame

SG 7 ↔ B Signal Ground

TD(A)
TD(B)

2

11

↔
↔

P S TD(A)

TD(B)

RD(A)
RD(B)

3

21

↔
↔

R T RD(A)

RD(B)

RTS(A) 4 ↔ C RTS

CTS(A) 5 ↔ D CTS

DSR(A) 6 ↔ E DSR

DTR(A) 20 ↔ H DTR

DCD(A) 8 ↔ F DCD

ETC(A)
ETC(B)

24
16

↔
↔

U W ETC(A)

ETC(B)

TC(A)
TC(B)

15
23

↔
↔

Y

AA

TC(A)
TC(B)

RC(A)
RC(B)

17
25

↔
↔

V X RC(A)

RC(B)

RLB 9 ↔ HH RL

LLB 18 ↔ JJ LL

TM 10 ↔ KK TM

Table 3-1 : HDB26 –MB34 adapter cable pin out for V.35

Chapter 3. Data Modules

18 TRM-01 APR 2000

3.4 RS-530 Data Module

When the TRM-01 is ordered with an TRM01/530 option, an

FT1/530(public) card is supplied and an optional RS-530 adapter cable may be

ordered or assembled according to the following table. The adapter cable

follows the pin out standards shown below exactly.

Abbreviation HDB26

PIN#

DB25

PIN#

RS-530

Circuit

FG 1 ↔ 1 Frame

SG 7 ↔ 7 AB

TD(A)
TD(B)

2

11

↔
↔

2

14

BA(A)
BA(B)

RD(A)
RD(B)

3

21

↔
↔

3

16

BB(A)
BB(B)

RTS(A)
RTS(B)

4

13

↔
↔

4

19

CA(A)
CA(B)

CTS(A)
CTS(B)

5

14

↔
↔

5

13

CB(A)
CB(B)

DSR(A)
DSR(B)

6

22

↔
↔

6

22

CC(A)
CC(B)

DTR(A)
DTR(B)

20
12

↔
↔

20
23

CD(A)
CD(B)

DCD(A)
DCD(B)

8

26

↔
↔

8

10

CF(A)
CF(B)

ETC(A)
ETC(B)

24
16

↔
↔

24
11

DA(A)
DA(B)

TC(A)
TC(B)

15
23

↔
↔

15
12

DB(A)
DB(B)

RC(A)
RC(B)

17
25

↔
↔

17 9 DD(A)

DD(B)

RLB 9 ↔ 21 RL

LLB 18 ↔ 18 LL

TM 10 ↔ 25 TM

Table 3-2 : HDB26 –DB25 adapter cable pin out for RS-530

Chapter 3. Data Modules

19 TRM-01 APR 2000

3.5 RS-449 Data Module

When the TRM-01 is ordered with an TRM01/449 option, an

FT1/530(public) card is supplied and an optional RS-449 adapter cable may be

ordered or assembled according to the following table. The adapter cable

follows the pin out standards shown below exactly.

Abbreviation HDB26

PIN#

DB37

PIN#

RS-449

Circuit

FG 1 ↔ 1 Frame

SG 7 ↔ 19,20,37 SG,RC,SC

TD(A)
TD(B)

2

11

↔
↔

4

22

SD(A)
SD(B)

RD(A)
RD(B)

3

21

↔
↔

6

24

RD(A)
RD(B)

RTS(A)
RTS(B)

4

13

↔
↔

7

25

RS(A)
RS(B)

CTS(A)
CTS(B)

5

14

↔
↔

9

27

CS(A)
CS(B)

DSR(A)
DSR(B)

6

22

↔
↔

11
29

DM(A)
DM(B)

DTR(A)
DTR(B)

20
12

↔
↔

12
30

TR(A)
TR(B)

DCD(A)
DCD(B)

8

26

↔
↔

13
31

RR(A)
RR(B)

ETC(A)
ETC(B)

24
16

↔
↔

17
35

TT(A)
TT(B)

TC(A)
TC(B)

15
23

↔
↔

5

23

ST(A)
ST(B)

RC(A)
RC(B)

17
25

↔
↔

8

26

RT(A)
RT(B)

RLB 9 ↔ 14 RL

LLB 18 ↔ 10 LL

TM 10 ↔ 18 TM

Table 3-3 : HDB26 –DB37 adapter cable pin out for RS-449

Chapter 3. Data Modules

20 TRM-01 APR 2000

3.6 X.21 Data Module

When the TRM-01 is ordered with an TRM01/X21 option, an

FT1/530(public) card is supplied and an optional X.21 adapter cable may be

ordered or assembled according to the following table. The adapter cable

follows the pin out standards shown below exactly.

Abbreviation HDB26

PIN#

DB15

PIN#

X.21

Circuit

FG 1 ↔ 1 Shield

SG 7 ↔ 8 Ground

TD(A)
TD(B)

2

11

↔
↔

2 9 Transmit(A)

Transmit(B)

RD(A)
RD(B)

3

21

↔
↔

4

11

Receive(A)
Receive(B)

RTS(A)
RTS(B)

4

13

↔

3

10

Control(A)

Control(B)
DCD(A)
DCD(B)

8

26

↔

5

12

Indication(A)

Indication(B)
ETC(A)
ETC(B)

24
16

↔
↔

7

14

Ext. Timing(A)

Ext. Timing(B)
RC(A)

RC(B)

17
25

↔
↔

6

13

Signal Timing(A)

Signal Timing(B)

Table 3-4 : HDB26 –DB15 adapter cable pin out for X.21

Chapter 3. Data Modules

21 TRM-01 APR 2000

3.7 ET10 10Base-T Ethernet Bridge Module

When the TRM-01 is ordered with an TRM01/ET10 option, an

FT1/ET10 card and HDB26 to RJ-45 adapter are supplied and assembled

according to the following table. The FT1/ET10 Card includes an additional

“daughter” board to handle the Ethernet interface and Bridging functions. This

board has two (2) DIP switches which may only be accessed by removing the

daughter board. (Refer to Figure 3-4.) Pull the board straight out and avoid

bending the pins. After setting, press the daughter board back onto the FT1

Card, closely observing the 20 and 26 pin connectors.

Connection to HUB (1:1)

(depends on S1 setting)

Connection to PC (cross)

(depends on S1 setting)

HDB26 RJ-45 HDB26 RJ-45

11 1 T+ 11 1 R+
12 2 T- 12 2 R­13 3 R+ 13 3 T+
14 4 14 4
15 5 15 5
16 6 R- 16 6 T­17 7 17 7
18 8 18 8

Table 3-5 : HDB26 –RJ-45 adapter pin out for 10Base-T

Figure 3-4 : ET10 Daughter Board Removal/Replacement

20 pin

connector

ET10

Daughter Board

26 pin

connector

FT1/ET10

Ethernet Bridge Card

daughter board

DIP Switches S1&S2

Chapter 3. Data Modules

22 TRM-01 APR 2000

ET10 : Attach to HUB (1:1) or PC (Crossover)

S1 === =x=

1 ON* OFF
2 ON* OFF
3 ON* OFF
4 ON* OFF
5 OFF* ON
6 OFF* ON
7 OFF* ON
8 OFF* ON

* factory setting

Table 3-6 : ET10 Daughter Board DIP Switch S1 Settings

S2 Set Comment Comment

1 ON* Factory Default Do not change
2 ON* Factory Default Do not change
3 ON* Factory Default Do not change
4 OFF* Factory Default Do not change
5 ON* Factory Default Do not change
6 X

OFF* = Full Duplex

ON = Half Duplex
7 X OFF* = Compression enabled ON = Compression disabled
8 X OFF* = Filter Disabled

(Repeater mode)

ON = Filter Enabled

(Bridge mode)

* factory setting

Table 3-7 : ET10 Daughter Board DIP Switch S2 Settings

SPECIFICATIONS

• BRIDGE

LAN Table: 10,000 MAC address with 5 minute automatic aging
Filtering and Forwarding: 15,000 frames/sec
Buffer: 256 frames
Delay: 1 frame

• LAN

Standard: Conforms to IEEE 802.3 / 10Base-T Ethernet
Data Rate: 10Mbps (20Mbps/ 10Base-T in Full duplex topology)

Filter:

When this feature is disabled (S2-8 OFF), all frames are passed transparently. In
this configuration, the ET10 acts as a repeater. When the filter is enabled, frame
destinations are tested against the internal MAC address table. Filtering enabled is the
normal selection for Bridging.

Compression:

Enhanced Tinygram Compression increases data throughput over the WAN.
Valid Ethernet frames have a minimum length of 64 bytes. Frames shorter than 64 bytes
are padded. With compression enabled (S2-7 OFF), these padding bytes are stripped off
before being transmitted over the WAN, and re-padded when received on the other side.

Chapter 4. Loop Back Testing

23 TRM-01 APR 2000

4.1 General

In this chapter we shall explain the detailed functioning of the loop back

switches.

4.2 User Activated Loop back

The FT1 Card supports the following types of test loop backs.
Data Port local analog loop back.
T1 link local digital loop back.
T1 link remote loop back. (only works in CAS or CCS frame mode)

The user activated loop back functions may be accessed from the front

panel FT1 Card push-button switches, via the LOOPBACK PARAMETER

menu under ASCII terminal mode, or via SNMP. The latter two methods both

require the optional SNMP Card installed and will not be discussed any further

here. The available test functions via pushbutton switches are described on this

and the following pages.

4.3 T1 link local digital loop back

The FT1 Card local digital loop back is established as close to the DTE

interface as possible to check the satisfactory working of the FT1 Card and the

T1 link connection. Using this setting, the remote CSU/DSU must supply the

test signal and verify it upon its return.

(Loc dig loopbk depressed)

Figure 4-1. T1 link local digital loop back

User
DTE

Data

Port

T1

CSU

LOCAL FT1 Card

Chapter 4. Loop Back Testing

24 TRM-01 APR 2000

4.4 Data port local analog loop back

The FT1 Card local analog loop back is established in analog mode as

close as possible to the T1 line, to check the satisfactory working of the FT1

Card and the connection between the DTE and FT1 Card. This returns the

transmit signal of the Data port to the receive path of the Data port. The Data

Port must receive its own transmission, therefore we recommend never doing

this test when the data port is ET10 Ethernet bridge or collisions may result.

(Loc ana loopbk depressed)

Figure 4-2. Data port local analog loop back

4.5 T1 link remote loop back

The local FT1 Card signals the remote unit into digital loop back to

check satisfactory operation of the local FT1 Card, remote CSU/DSU and the

link between. If the User DTE is replaced with a BERT tester, the data cable,

FT1 Card, remote CSU/DSU and T1 link may all be tested.

(Rem loopbk depressed)

Figure 4-3. T1 link remote loop back

User
DTE

Data

Port

T1 to Remote

CSU

LOCAL FT1 Card

User
DTE

Data

Port

CSU

LOCAL FT1 Card

T1

link

Remote

CSU/DSU

loop back
code sent

Chapter 4. Loop Back Testing

25 TRM-01 APR 2000

4.6 BERT local loop back

For a local test, depress the Loc ana loopbk pushbutton or physically

hardwire the T1 link TX to the T1 link RX with coaxial (BNC) cable. Depress

the Pattern push-button switch. During BERT testing, the local DTE is

disconnected and the DSR line is off. An internal 511-bit pattern will be

generated according to ITU-T and connected to the transmit input of the local

data channel interface. The receive output is connected to the pattern tester. The

tester compares the received and transmitted patterns and detects errors, as

shown in Figure 4-4. (Err LED should be off during successful loop back.)

(Pattern and Loc ana loopbk depressed)

Figure 4-4. BERT for local test

4.7 BERT remote loop back for system test

For a system test, the remote site CSU/DSU must support CTC's

proprietary remote loop back (Such as TTU-01 or another FT1 Card) and both

must be in matching frame mode. The local unit will depress both the Pattern

and Rem loopbk pushbutton switches. The entire T1 link may then be tested, as

shown in Figure 4-5.

(Rem loopbk and Pattern depressed)

Figure 4-5. BERT used for system test

User
DTE

Data

Port

T1

CSU

LOCAL FT1 Card

Generator

Tester

User
DTE

Data
Port

CSU

LOCAL FT1 Card

Generator

Tester

T1

link

Remote

CSU/DSU

loop back
code sent

Chapter 4. Loop Back Testing

26 TRM-01 APR 2000

This page left blank intentionally

Chapter 5. Troubleshooting

27 TRM-01 APR 2000

5.1 General

As in troubleshooting any type of computer, network, or communication

problem, it is very important to follow a very logical procedure. During any

troubleshooting session, the importance of taking notes cannot be overstated. It

is very easy to forget connections or settings when troubleshooting a large

network. Notes will help in logically checking all items and will also serve as a

valuable aid in writing a system log or other report to your supervisor or your

customer following successful completion of work. Notes also serve as

important tools for future troubleshooting or for training of new personnel or

just simply as a memory refresher.

When dealing with troubleshooting of first time installation problems, the

best place to start is with double-checking of configuration settings and

connections. It is very easy to misinterpret a DIP switch setting and cause the

failure of a link. Initial configuration problems will also cause either immediate

failure or inconsistent operations. Although the FT1 Cards all comply with ITU

G.703 recommendations, it is very important to understand the differences in

terminology between different equipment manufactures. A thorough

understanding of the settings and configuration of related equipment is

mandatory when integrating many vendors' equipment.

Having the proper tools is also important in any troubleshooting endeavor.

When troubleshooting T1 connections a transmission analyzer is an invaluable

tool in isolating configuration, line or hardware problems. CTC Union's BTM-

10 T1 Transmission Analyzer is an excellent choice. The unit is very portable,

battery operated, with built-in keyboard and LCD display. The tester is designed

to do BERT (Bit Error Rate) testing via T1 connection or via Data Port

connection at speeds up to 1.544Mbps.

5.2 Connections

When checking for connection related problems, start by looking for

physical defects in the connectors themselves. Check for broken or bent pins,

corrosion and mis-wiring. Check cables for pinching that could indicate a

broken or shorted wire. For twisted pair wiring, confirm that a wire pair actually

goes to the proper transmit or receive signal pairs. Build yourself an RJ-45

break-out-box from a pigtail converter. Loop back the pairs in the BOB and

confirm continuity with a multi-meter.

Chapter 5. Troubleshooting

28 TRM-01 APR 2000

5.3 Configuration

When physical connections have been confirmed, start looking for

configuration problems. Confirm that the proper line code is being used. The

FT1 Cards all support AMI and B8ZS line codes. In almost all instances, the

line code will be B8ZS. Confirm settings.

Framing errors can result if setting errors are made. Confirm the mode,

whether which framed-format. If both sides of the T1 link are using different

framing, there will be alarm indications.

Data errors may result if the timeslot assignments in fractional mode do

not match. Check the settings carefully. For reduced monthly charges, a

customer may only request a fraction of the T1 bandwidth. In this instance, an

ISP may provide a fraction of the full 1.544Mbps bandwidth to a customer by

utilizing Fractional T1. If only 512Kbps is requested, only eight (8) timeslots

are required to carry the data payload. Carefully check the settings at the central

site and confirm that the same eight timeslots are active on each end of the link.

Configuration check list:

T1 Line Code: Under most circumstances, line code should be set to B8ZS. Confirm

settings on both sides of the T1 link. (Sw6-4)

Frame Mode: Confirm switch settings for unframed or framed. Both sides of T1 link
must match. (Sw6-5, Sw2~Sw4 all off is unframed mode)

Timeslot settings: Double check same active timeslots on each side of link. (Sw2, Sw3,
Sw4)

Cascade: If not cascading, ensure this setting is off. (Sw7-4)

Data channel rate: May be set for 56 or 64Kbps. (Sw6-8)

DTE/DCE: The FT1 Card's data port is DCE. Connect to DTE equipment or custom

make the appropriate "null" cable.

System timing: In point-to-point applications, one unit must provide clock, whether
from internal or from the data port. The other unit must be set to recovery. For network
connections, both units are usually set to recovery, as the network provides the timing
source.

Chapter 5. Troubleshooting

29 TRM-01 APR 2000

5.4 FT1 Card Testing

The example given here refers to use of CTC Union's BTM-10 T1

Transmission Analyzer. To test any of the FT1 Cards, connect either an RJ-45

T1 cable or two coaxial cables between the Device Under Test (DUT) and the

BTM-10 tester.

Configure the FT1 Card framed mode, B8ZS line code, termination (100

ohm, and internal clock source. Depress the front panel Loc dig loopbk switch.

Configure the analyzer for T1 BERT, unframed, 100 ohm termination, B8ZS

line code, external Tx and Rx clock, QRSS pattern and run "forever". Run the

BERT. Confirm 1.536Mbps rate and no receive errors. If testing a remote link,

inject a forced error and confirm loop back receipt of one error.

The BTM-10 may also be configured to do high-speed BERT from its

data port. Alternatively, our HCT-6000 or HCT-BERT 2M analyzers may be

configured to connect to the data port side of the DUT. In this setup, the FT1

Card and the link may be tested.

User
DTE

Data

Port

BTM-10

Analyzer

CSU

LOCAL FT1 Card

Datacom

tester

(BTM-10

or

HCT-6000)

Data

Port

CSU

LOCAL FT1 Card

T1

link

Remote

CSU/DSU

loop back
code sent

Chapter 5. Troubleshooting

30 TRM-01 APR 2000

If for example the FT1 Card is an FT1/RS530, the tester is connected

directly to the RS-530 interface of the data port. The clock on the tester is set to

"external". Set up for BERT test and run a pattern to the data port. Depress the

Rem loopbk switch on the local unit. This will place the remote CSU into

loop back mode allowing the BERT signal to be received at the local unit. You

may run the BERT for a twenty-four hour period for a longevity test. It is

always a good idea to manually inject an error and confirm proper receipt of the

error from the link.

To test the FT1 Card standalone in the rack, the on-card pattern generator

and local loop back functions may be used without any external equipment.

Ensure that the FT1 Card has its clock source set to internal. Depress both the

Pattern and Loc ana loopback switches. The pattern generator is internally

connected to the DSU side while the loop back is placed on the CSU in analog

mode. (Refer to Figure 4-4 on page 25) The red Test LED will be lit and there

should be no Err LED indications. The yellow RD LED will flash since the

pattern generator is connected, running, and looping back to the DTE. The T1

link will experience Sig Loss, since it is not connected.

To test a pair of FT1 Cards in a rack, cross connect the T1 lines (Rx to

Tx, Tx to Rx), configure both cards for framed mode, and time slots 1 ~ 24 all

active. Set one card with internal clock source and the other for recovery. On

one card depress both the Pattern and Rem loopbk switches. Alternatively, on

one card depress the Pattern switch while depressing the Loc dig loopbk switch

on the other card. During successful loop back, both cards will exhibit flashing

yellow RD LEDs, and no red LED indications except Test.

Data

Port

CSU

LOCAL FT1 Card

Generator

Tester

CSU

Data

Port

LOCAL FT1 Card

Chapter 5. Troubleshooting

31 TRM-01 APR 2000

Here's one more test based upon the previous setup. Depress both Pattern

switches on each card. Now, each pattern generator is sending to the other card,

while each pattern tester is receiving the 511-bit pattern from the other card.

The same successful indicators as previous apply.

Data
Port

CSU

LOCAL FT1 Card

Generator

Tester

CSU

Data

Port

Generator

Tester

LOCAL FT1 Card

Chapter 5. Troubleshooting

32 TRM-01 APR 2000

This page left blank intentionally.

Appendix A. DIP Switch Settings

33 TRM-01 APR 2000

DIP SWITCH FUNCTION DESCRIPTIONS

DIPSW FUNCTION COMMENT

2 Time slot 1 to 8 settin

g

See Table A-2

3 Time slot 9 to 16 setting See Table A-3

4 Time slot 17 to 24 setting See Table A-4

5 Line build out setting See Table A-5

6 Parameter group 1 setting See Table A-6

7 Parameter group 2 setting See Table A-7

Table A-1 : DIP SWITCH FUNCTION DESCRIPTIONS

DIPSW2

DIP SW2 STATE FUNCTION COMMENT

-1 OFF Time slot 1 disable Note 1

ON Time slot 1 enable Note 2

-2 OFF Time slot 2 disable

ON Time slot 2 enable

-3 OFF Time slot 3 disable

ON Time slot 3 enable

-4 OFF Time slot 4 disable

ON Time slot 4 enable

-5 OFF Time slot 5 disable

ON Time slot 5 enable

-6 OFF Time slot 6 disable

ON Time slot 6 enable

-7 OFF Time slot 7 disable

ON Time slot 7 enable

-8 OFF Time slot 8 disable

ON Time slot 8 enable

Table A-2 : DIPSW2 TIME SLOT 1 TO 8 SETTING

Appendix A. DIP Switch Settings

34 TRM-01 APR 2000

DIPSW3

DIP SW3 STATE FUNCTION COMMENT

-1 OFF Time slot 9 disable

ON Time slot 9 enable

-2 OFF Time slot 10 disable

ON Time slot 10 enable

-3 OFF Time slot 11 disable

ON Time slot 11 enable

-4 OFF Time slot 12 disable

ON Time slot 12 enable

-5 OFF Time slot 13 disable

ON Time slot 13 enable

-6 OFF Time slot 14 disable

ON Time slot 14 enable

-7 OFF Time slot 15 disable

ON Time slot 15 enable

-8 OFF Time slot 16 disable

ON Time slot 16 enable

Table A-3 : DIPSW3 TIME SLOT 9 TO 16 SETTING

DIPSW4

DIP SW4 STATE FUNCTION COMMENT

-1 OFF Time slot 17 disable

ON Time slot 17 enable Note 1

-2 OFF Time slot 18 disable

ON Time slot 18 enable

-3 OFF Time slot 19 disable

ON Time slot 19 enable

-4 OFF Time slot 20 disable

ON Time slot 20 enable

-5 OFF Time slot 21 disable

ON Time slot 21 enable

-6 OFF Time slot 22 disable

ON Time slot 22 enable

-7 OFF Time slot 23 disable

ON Time slot 23 enable

-8 OFF Time slot 24 disable

ON Time slot 24 enable

Table A-4 DIPSW4 TIME SLOT 17 TO 24 SETTING

Appendix A. DIP Switch Settings

35 TRM-01 APR 2000

DIPSW5

DIP SW4

STATE FUNCTION COMMAND

-1,-2,-3

OFF OFF OFF

0 to 133 feet / 0dB

ON OFF OFF

133 to 266 feet

OFF ON OFF

266 to 399 feet

ON ON OFF

399 to 533 feet

OFF OFF ON

533 to 655 feet

ON OFF ON

-7.5 dB

OFF ON ON

-15 dB

ON ON ON

-22.5 dB

-4 OFF Reserved

ON Reserved

-5 OFF Reserved

ON Reserved

-6 OFF Reserved

ON Reserved

-7 OFF Reserved

ON Reserved

-8 OFF Reserved

ON Reserved

Table A-7 : DIPSW5 SETTING

DIPSW6

DIP SW6 STATE FUNCTION COMMENT

-1,-2,-3 OFF OFF OFF Clock mode 0

(

DCE1) Recover

y

1

ON OFF OFF Clock mode 1 (DCE2) Internal Osc.

1

OFF ON OFF Clock mode 2 (DTE1) Transparent

1

ON ON OFF Clock mode 3 (DTE2) Data Port

1

OFF OFF ON Clock mode 4 (DTE3) Data Port

1

ON OFF ON Reserve

OFF ON ON Reserve

ON ON ON Reserve

-4 OFF Line code: HDB3

ON Line code: AMI

-5 OFF Frame mode: CCS (PCM31) ignored when unframed

ON Frame mode: CAS (PCM30) ignored when unframed

-6 OFF CRC4: OFF ignored when unframed

ON CRC4: ON ignored when unframed

-7 OFF Idle code: Mark (0xff) ignored when unframed

ON Idle code: Flag (0x7e) ignored when unframed

-8 OFF Data channel rate: n × 64K ignored when unframed
ON Data channel rate: n × 56K ignored when unframed

Table A-8 : DIPSW6 PARAMETER GROUP 1 SETTING

Note 1: See Table A-10 for detailed clock mode.

Appendix A. DIP Switch Settings

36 TRM-01 APR 2000

DIPSW7

DIP SW7 STATE FUNCTION COMMENT

-1 OFF RC timin

g p

olarity : Normal

ON RC timing polarity : Invert

-2 OFF TC timing polarity : Normal

ON TC timing polarity : Invert

-3 OFF DCD control : Always ON

ON DCD control : Follow RTS

-4 OFF Multiple (cascade) : Disable

ON Multiple (cascade) : Enable

-5 OFF Signaling : Non pass through

ON Signaling : Pass through

-6 OFF Setting from : DIP switch

ON Setting from : EEPROM

-7 OFF Data port controlled loopback: Disable

ON Data port controlled loopback: Enable

-8 OFF Front panel loopback: Disable Note 3

ON Front panel loopback: Enable

Table A-7 : DIPSW7 PARAMETER GROUP 2 SETTING

Note 1: Use this setting to de-activate the front panel pushbuttons. This will prevent un­authorized or accidental link breakage. In order for the front panel switches to function,
this setting must be ON. By default, it is ON from the factory.

CLOCK MODE DESCRIPTION

CLOCK DIPSW 6 T1 LINE USER DATA PORT

MODE STATE TRANSMIT RECEIVE TRANSMIT

-1 -2 -3 CLOCK SOURCE CLOCK SOURCE CLOCK SOURCE

0*

(DCT1)

OFF* OFF* OFF*

RECOVERY

RECOVERY
Output to RC pin

RECOVERY
Output to TC pin

1

(DCE2)

ON OFF OFF

INTERNAL
OSCILLATOR

INTERNAL
Output to RC pin

INTERNAL
Output to TC pin

2

(DTT1)

OFF ON OFF

EXTERNAL
Locked to ETC pin

RECOVERY
Output to RC pin

EXTERNAL
Input from ETC pin

3

(DTE2)

ON ON OFF

EXTERNAL
Locked to ETC pin

EXTERNAL
Input from DTR
pin

EXTERNAL
Input from ETC pin

4

(DTE3)

OFF OFF ON

EXTERNAL
Locked to ETC pin

EXTERNAL
Input from ETC
pin

EXTERNAL
Input from ETC pin

Table A-8 : CLOCK MODE DESCRIPTION

* This is the normal setting for network operation.

Appendix A. DIP Switch Settings

37 TRM-01 APR 2000

This page left blank intentionally.

notes:

38

notes:

39

Technical Inquiry Form

TRM-01 MODEL No.: FT1/V.35 FT1/RS-530 FT1/ET10

Please fill in the DIP switches configuration with '✓' marks into the following

table. Send it to us by fax, and we will reply to you immediately.

Your Setting CTC Suggestion

SW NO. DIP

FUNCTION

ON OFF ON OFF
1 Timeslot 1
2 Timeslot 2
3 Timeslot 3
4 Timeslot 4
5 Timeslot 5
6 Timeslot 6
7 Timeslot 7

SW2

8 Timeslot 8
1 Timeslot 9
2 Timeslot 10
3 Timeslot 11
4 Timeslot 12
5 Timeslot 13
6 Timeslot 14
7 Timeslot 15

SW3

8 Timeslot 16
1 Timeslot 17
2 Timeslot 18
3 Timeslot 19
4 Timeslot 20
5 Timeslot 21
6 Timeslot 22
7 Timeslot 23

SW4

8 Timeslot 24
1 Line Build Out Setting
2 Line Build Out Setting
3 Line Build Out Setting
4 Reserved
5 Reserved
6 Reserved
7 Reserved

SW5

8 Reserved

SW6 1 Rx/Tx timing source

2 Rx/Tx timing source
3 Rx/Tx timing source
4 Line code: B8ZS or AMI
5 Frame mode : SF or ESF
6 Reserved
7 Idle code: Mark or Flag
8 Data port rate: n x 64K or n x 56K

SW7 1 RC Timing Polarity : Normal or Invert

2 TC Timing Polarity : Normal or Invert
3 DCD control : On or RTS
4 Cascade : Disable or Enable
5 Signaling : Non pass or pass through
6 Setting source : DIP SW or EEPROM
7 Data port loop back
8 Front panel switch functions

T1 Access Unit

CTC Union Technologies Co., Ltd.

Far Eastern Edison Science and Technologies Center
(Nei-Hu HI-TEC Park)
6F-3, Lane 360, Nei-Hu Road, Section 1
Nei-Hu, Taipei, Taiwan
Phone:[phone] (Rep) Fax:[phone]
E-mail: [email protected]

http://www.ctcu.com