Black Box MT1000A-13, MT1000A-E1-85, MT1000A-85, MT1000A-E1-13 User Manual

Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500)
FREE technical support 24 hours a day, 7 days a week: Call 724-746-5500 or fax [phone]
Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: [e-mail]

CUSTOMER

SUPPORT

INFORMATION

MARCH 2003

MT1000A-13

MT1000A-85
MT1000A-E1-13
MT1000A-E1-85

T1 and E1 Fiber Muxes

FCC AND IC RFI STATEMENTS

1

FEDERAL COMMUNICATIONS COMMISSION

AND

INDUSTRY CANADA

RADIO FREQUENCY INTERFERENCE STATEMENTS

This equipment generates, uses, and can radiate radio-frequency energy, and if not installed and used
properly, that is, in strict accordance with the manufacturer’s instructions, may cause interference to radio
communication. It has been tested and found to comply with the limits for a Class A computing device in
accordance with the specifications in Subpart B of Part 15 of FCC rules, which are designed to provide
reasonable protection against such interference when the equipment is operated in a commercial
environment. Operation of this equipment in a residential area is likely to cause interference, in which
case the user at his own expense will be required to take whatever measures may be necessary to correct
the interference.

Changes or modifications not expressly approved by the party responsible for compliance could void the user’s
authority to operate the equipment.

This digital apparatus does not exceed the Class A limits for radio noise emission from digital apparatus set out in the Radio
Interference Regulation of Industry Canada.

Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites applicables aux appareils numériques
de la classe A prescrites dans le Règlement sur le brouillage radioélectrique publié par Industrie Canada.

T1 AND E1 FIBER MUXES

2

INSTRUCCIONES DE SEGURIDAD (Normas Oficiales Mexicanas Electrical Safety Statement)

1. Todas las instrucciones de seguridad y operación deberán ser leídas antes de que el aparato eléctrico sea operado.

2. Las instrucciones de seguridad y operación deberán ser guardadas para referencia futura.

3. Todas las advertencias en el aparato eléctrico y en sus instrucciones de operación deben ser respetadas.

4. Todas las instrucciones de operación y uso deben ser seguidas.

5. El aparato eléctrico no deberá ser usado cerca del agua—por ejemplo, cerca de la tina de baño, lavabo, sótano
mojado o cerca de una alberca, etc..

6. El aparato eléctrico debe ser usado únicamente con carritos o pedestales que sean recomendados por el fabricante.

7. El aparato eléctrico debe ser montado a la pared o al techo sólo como sea recomendado por el fabricante.

8. Servicio—El usuario no debe intentar dar servicio al equipo eléctrico más allá a lo descrito en las instrucciones de
operación. Todo otro servicio deberá ser referido a personal de servicio calificado.

9. El aparato eléctrico debe ser situado de tal manera que su posición no interfiera su uso. La colocación del aparato
eléctrico sobre una cama, sofá, alfombra o superficie similar puede bloquea la ventilación, no se debe colocar en
libreros o gabinetes que impidan el flujo de aire por los orificios de ventilación.

10. El equipo eléctrico deber ser situado fuera del alcance de fuentes de calor como radiadores, registros de calor, estufas
u otros aparatos (incluyendo amplificadores) que producen calor.

11. El aparato eléctrico deberá ser connectado a una fuente de poder sólo del tipo descrito en el instructivo de
operación, o como se indique en el aparato.

12. Precaución debe ser tomada de tal manera que la tierra fisica y la polarización del equipo no sea eliminada.

13. Los cables de la fuente de poder deben ser guiados de tal manera que no sean pisados ni pellizcados por objetos
colocados sobre o contra ellos, poniendo particular atención a los contactos y receptáculos donde salen del aparato.

14. El equipo eléctrico debe ser limpiado únicamente de acuerdo a las recomendaciones del fabricante.

15. En caso de existir, una antena externa deberá ser localizada lejos de las lineas de energia.

16. El cable de corriente deberá ser desconectado del cuando el equipo no sea usado por un largo periodo de tiempo.

17. Cuidado debe ser tomado de tal manera que objectos liquidos no sean derramados sobre la cubierta u orificios de
ventilación.

18. Servicio por personal calificado deberá ser provisto cuando:

A: El cable de poder o el contacto ha sido dañado; u

B: Objectos han caído o líquido ha sido derramado dentro del aparato; o

C: El aparato ha sido expuesto a la lluvia; o

D: El aparato parece no operar normalmente o muestra un cambio en su desempeño; o

E: El aparato ha sido tirado o su cubierta ha sido dañada.

TRADEMARKS/WARNINGS

3

TRADEMARKS USED IN THIS MANUAL

ST is a registered trademark of AT&T.

Any other trademarks mentioned in this manual are acknowledged to be the property of the trademark owners.

WARNING

These products are equipped with a laser diode. Please observe the following
precautions:

• Before turning on the equipment, make sure that the fiber optic cable is intact and is
connected to the transmitter.

• Do not attempt to adjust the laser drive current.

• Do not use broken or unterminated fiber optic cables/connectors or look straight at
the laser beam.

• Using optical devices with this equipment will increase the risk of eye injury.

• Performing procedures other than those specified herein may result in hazardous
radiation exposure.

CAUTION: The laser beam may be invisible!

Always observe standard safety precautions during product installation, operation,
and maintenance. Only qualified and authorized service personnel should carry out
product adjustment, maintenance, or repairs. No installation, adjustment,
maintenance, or repairs should be performed by either the operator or the user.

T1 AND E1 FIBER MUXES

4

Contents

Chapter Page

1. Specifications ............................................................................................................................................................6

2. Introduction..............................................................................................................................................................8

2.1 Overview ...........................................................................................................................................................8

2.2 Physical Description ........................................................................................................................................9

2.3 Functional Description....................................................................................................................................9

2.3.1 Fiber Link Interface Characteristics ..................................................................................................9

2.3.2 Channel Interface Characteristics ...................................................................................................10

2.3.3 Service Channel.................................................................................................................................10

2.3.4 Test and Diagnostic Capabilities ......................................................................................................11

2.3.5 Management and Monitoring..........................................................................................................12

2.3.6 Power Requirements.........................................................................................................................12

2.4 Package Contents ..........................................................................................................................................12

3. Installation and Setup ............................................................................................................................................13

3.1 Introduction...................................................................................................................................................13

3.2 Site Requirements and Prerequisites ...........................................................................................................13

3.2.1 Power..................................................................................................................................................13

3.2.2 Channel Connections .......................................................................................................................13

3.2.3 Fiber Link Connections....................................................................................................................13

3.2.4 Front and Rear Clearance ................................................................................................................14

3.2.5 Ambient Requirements.....................................................................................................................14

3.3 Additional Equipment Needed ....................................................................................................................14

3.4 Setting the Internal Jumpers and Switches..................................................................................................14

3.5 Making Connections .....................................................................................................................................19

3.5.1 Connector Location..........................................................................................................................19

3.5.2 Connecting the Channels on T1 Versions (MT1000A-85 and MT1000A-13) ..............................19

3.5.3 Connecting the Channels on E1 Versions (MT1000A-E1-85 and MT1000A-E1-13)....................19

3.5.4 Connecting the Fiber Links on Both T1 and E1 Versions .............................................................19

3.5.5 Connecting the Alarm Relays on Both T1 and E1 Versions ..........................................................19

3.5.6 Connecting the Service Channel on Both T1 and E1 Versions.....................................................20

3.5.7 Grounding .........................................................................................................................................20

3.5.8 Connecting the AC Power ................................................................................................................20

3.6 Rackmounting the Mux ................................................................................................................................20

4. Operation ................................................................................................................................................................21

4.1 Front-Panel Indicators, Connectors, and Pushbutton................................................................................21

4.2 Operating Instructions..................................................................................................................................23

4.2.1 Turning the Mux On............................................................................................................................23

4.2.2 Normal Indications ..............................................................................................................................23

4.2.3 Using the Service Channel ..................................................................................................................23

4.2.4 Turning the Mux Off ...........................................................................................................................23

CONTENTS

5

Chapter Page

5. Management ...........................................................................................................................................................24

5.1 Setting Terminal Communication................................................................................................................24

5.1.1 Setting the Terminal Communication Parameters.........................................................................24

5.1.2 Entering the Terminal Session .........................................................................................................25

5.2 Status Monitoring ..........................................................................................................................................26

5.2.1 T1 or E1 and Fiber Optic Interface Status ......................................................................................26

5.2.2 Functional Blocks Status...................................................................................................................27

5.3 Configuring the Mux.....................................................................................................................................28

5.3.1 Viewing the Interface Configurations .............................................................................................28

5.3.2 Setting/Resetting Loopbacks in the Local Mux.............................................................................30

5.3.3 Setting/Resetting Loopbacks in the Remote Mux .........................................................................30

5.3.4 Invoking Special Actions...................................................................................................................31

5.3.5 Setting/Resetting the T1 or E1 Remote Loopback........................................................................32

5.3.6 Resetting to the Default Configuration...........................................................................................32

5.4 Changing the Password.................................................................................................................................33

5.5 Viewing Hardware and Software Updates ...................................................................................................34

5.6 Downloading Software ..................................................................................................................................34

6. Testing and Diagnostics..........................................................................................................................................35

6.1 Diagnostic Tests..............................................................................................................................................35

6.1.1 Local Loopbacks in the Local Mux..................................................................................................35

6.1.2 Local Loopbacks in the Remote Mux..............................................................................................37

6.1.3 Fiber Optic Remote Loopback.........................................................................................................38

6.2 Troubleshooting ............................................................................................................................................39

6.3 Calling Black Box ..........................................................................................................................................40

6.4 Shipping and Packaging ...............................................................................................................................40

Appendix. Interface Specifications............................................................................................................................41

A.1 Channel Connectors .....................................................................................................................................41

A.2 ALARMS Connector......................................................................................................................................41

A.3 CONTROL Connector..................................................................................................................................42

A.4 Power Connectors..........................................................................................................................................42

T1 AND E1 FIBER MUXES

6

1. Specifications

Fiber Optic Interface (All Models)

Standards — ITU-T Rec. G.956

Data Rates — MT1000A-85 and MT1000A-13: 6.176 Mbps, nominal;

MT1000A-E1-85 and MT1000A-E1-13: 8.448 Mbps (E2 link), nominal

Maximum Distance — MT1000A-85: Multimode up to 3 km (1.9 miles);
MT1000A-13: Single-mode up to 48 km (29.8 miles);
MT1000A-E1-85: Multimode up to 4 km (2.5 miles);
MT1000A-E1-13: Single-mode up to 44 km (27.3)

Performance — See Table 2-1

Connectors — (1) pair ST

®

Supervisor Port Specifications (All Models)

Control DTE Interface — V.24/RS-232, asynchronous

Control DTE Connectors — (1) DB9 F

Control DTE Data Rates — 9.6, 19.2, 38.4, or 57.6 kbps

Voice Service Channel for Standard Headset (All Models)

Input Impedance — 33 kΩ

Input Level — 5 mV

Output Level — 50 mW @ 8Ω

Bandwidth (-3 dB) — 3 to 3000 Hz

Call Indication — LED and internal buzzer

ALARMS Relay Connector (All Models)

Connector — (1) DB9 F

Contact Functions — Set of floating normally closed/normally open contacts for major and minor alarm

indication

Contact Rating (Maximum) — 1 A (at 60 VDC or 30 VAC) through closed contacts

CHAPTER 1: Specifications

7

T1 Channel Interfaces (MT1000A-85 and MT1000A-13)

Standards — ITU-T Rec. G.703, G.824

Line Data Rate — 1.544 Mbps, nominal

Line Encoding — B8ZS

Line Impedance — 100 Ω balanced

Transmit Levels — ±2.8V ± 10%

Receive Levels — 0 dB to -2.4 dB

Jitter Performance — Per ITU-T Rec. G.824, Para. 4

Connectors — (4) RJ-48C

E1 Channel Interfaces (MT1000A-E1-85 and MT1000A-E1-13)

Standards — ITU-T Rec. G.703, G.823

Line Data Rate — 2.048 Mbps, nominal

Line Encoding — HDB3

Line Impedance — 120 Ω balanced; 75 Ω unbalanced

Unbalanced Interface — ±2.37V ± 10%

Receive Levels — 0 to -6 dB

Jitter Performance — Per ITU-T Rec. G.823

Connectors — Balanced interface: (4) RJ-45; Unbalanced interface: (2) BNC coax per channel

General Specifications (All Models)

Indicators — (20) LEDs: POWER A, POWER B, SYSTEM MNG, SYSTEM CALL, LOC TEST, REM TEST, MAIN,
BACKUP, AIS MAIN, AIS BACKUP, SYNC LOSS MAIN, SYNC LOSS BACKUP, AIS CH1, AIS CH2, AIS CH3,
AIS CH4, SYNC LOSS CH1, SYNC LOSS CH2, SYNC LOSS CH3, SYNC LOSS CH4

Temperature — Operating: 32 to 122°F (0 to 50°C)

Relative Humidity — Up to 90%, noncondensing

Power — (2) 100–240-VAC, 47–63-Hz, autosensing, 12-VA power supplies

Size — 1.75"H (1U) x 17"W x 8.2"D (4.4 x 43.2 x 20.8 cm)

Weight — 4.4 lb. (2 kg)

T1 AND E1 FIBER MUXES

8

2. Introduction

2.1 Overview

The T1 and E1 Fiber Muxes (available in 850-nm and 1310-nm versions) combine four T1(1.544 Mbps) or E1
(2.048 Mbps) channels into a single fiber optic link that boasts data rates of either 6.176 Mbps (T1 versions)
or 8.448 Mbps (E1 versions). On the fiber optic side, the multiplexor’s interface gives you a secure link that
communicates in areas susceptible to electromagnetic interference while increasing the maximum connection
range. The fiber interface also protects against the harmful effects of ground loops. The muxes can only be
used in pairs.

The T1 and E1 Fiber Muxes offer these additional features:

• A pair of the 850-nm T1 muxes offers multimode distances of up to 3 km (1.9 miles), and a pair of the
single-mode 1310-nm T1 muxes gives you a maximum range of 48 km (29.8 miles).

• Used in pairs, the E1 muxes offer multimode distances of 4 km (2.5 miles) with the 850-nm model and
single-mode distances of 44 km (27.3) with the 1310-nm model.

• Redundant power supply for all versions.

• Voice service channel for end-to-end communications between maintenance personnel.

• Transmits each of the T1 or E1 channels independently, so each channel can have its own clock source.

• T1 models conform to ITU G.956, G.703, and G.824 standards. E1 models meet ITU G.956, G.703, and
G.823 standards.

Figure 2-1. Typical application showing a pair of local and remote T1 or E1 Fiber Muxes.

(Note that the backup fiber link is possible only by adding an optional redundant fiber link board to each mux.

For more information on this modular board, contact Technical Support.)

Voice

Channel

Connection

Voice

Channel

Connection

ASCII Terminal Linked

to Supervisory Port

ASCII Terminal Linked

to Supervisory Port

(Optional) Backup Fiber Link

Fiber Link

T1 or E1 Channel Links

to Various Devices

CHAPTER 2: Introduction

9

MODELS AVAILABLE:

• T1 Fiber Mux 850-nm (MT1000A-85)

• T1 Fiber Mux 1300-nm (MT1000A-13)

• E1 Fiber Mux 850-nm (MT1000A-E1-85)

• E1 Fiber Mux 1300-nm (MT1000A-E1-13)

2.2 Physical Description

The T1 or E1 Fiber Mux is a compact unit that’s only 1U (1.75") high, so installation on a desktop or shelf is
easy. We also offer a Rackmount Kit (RM1001), which enables you to install the mux in a 19" rack.

The mux’s front panel provides LED indicators, a control connector, and a headset jack, as illustrated in
Figure 2-2. For more information about the front-panel indicators and connectors, refer to Chapter 4. Power
connectors, fiber optic connectors, and T1 or E1 interfaces can be accessed via the mux’s rear panel. For more
information about rear-panel connectors, refer to Section 3.5.

Figure 2-2. The mux’s front-panel indicators and connectors.

2.3 Functional Description

T1 and E1 Fiber Muxes contain a main circuit board, including four channel interfaces, and one fiber optic
interface board. The interfaces are described below along with descriptions of the service channel, test and
diagnostic capabilities, management and monitoring, and power requirements. An optional redundant fiber
link board for establishing a backup fiber link is also available, as is a redundant E2 link board and DC power­supply options. (For more information, contact Technical Support.)

2.3.1 F

IBER LINK INTERFACE CHARACTERISTICS

The installed fiber optic interface, which has a pair of ST connectors, complies with the requirements of
ITU-T Rec. G.956, and uses a proprietary signaling format that ensures optimum performance. To optimally
meet a wide range of system requirements, the fiber interface on the MT1000A-85 and MT1000A-E1-85 enables
operation over 62.5/125-micron multimode fibers (typical attenuation -3.5 dB/km) and features a Vertical
Cavity Surface Emitting Laser (VCSEL) type of transmitter. The interface on the MT1000A-13 and MT1000A­E1-13 offers operation over low-loss 9/125-micron single-mode fibers (typical attenuation -0.4 dB/km at 1300
nm, and 0.25 dB/km at 1550 nm) and features a laser transmitter.

Table 2-1 lists the optical sub system’s characteristics including the maximum range over typical fiber optic
cable. The maximum range values given in the table assume a 3 dB margin.

T1 AND E1 FIBER MUXES

10

Table 2-1. Fiber optic characteristics.

Model (Wavelength) Fiber Type Transmitter Typical Output Receiver Typical

Type Power Sensitivity Maximum

Range

T1 Versions

MT1000A-85 (850 nm) 62.5/125 multimode VCSEL -18 dBm -32 dBm 3 km (1.9 miles)
MT1000A-13 (1310 nm) 9/125 single-mode Laser -12 dBm -34 dBm 48 km (29.8 miles)

E1 Versions

MT1000A-E1-85 (850 nm) 62.5/125 multimode VCSEL -18 dBm -32 dBm 4 km (2.5 miles)
MT1000A-E1-13 (1310 nm) 9/125 single-mode Laser -12 dBm -34 dBm 44 km (27.3 miles)

All fiber interfaces offer high performance and have a wide dynamic range, which ensures that the receiver
does not saturate even when using short fiber optic cables. (Saturation is caused when the optical power
applied to the receiver exceeds its maximum allowed input power and results in very high bit error rates.)

2.3.2 C

HANNEL INTERFACE CHARACTERISTICS

T1 channel interfaces

The T1 muxes’ channel interfaces meet the requirements of ITU-T Rec. G.703. Each channel port on the T1
models has a 100-ohm (Ω) balanced line interface terminated in an RJ-45 eight-pin connector. Line coding is
B8ZS. The nominal balanced interface transmit level is ±2.8 V. The line attenuation is up to 6 dB, and each
T1 signal is processed by an adaptive equalizer that compensates for various cable lengths to ensure optimal
performance. The T1 muxes use phase locked loops (PLL) to recover the clock signals, and the resulting jitter
performance complies with the requirements of ITU-T Rec. G.824, Para. 4.

E1 channel interfaces

As with the T1 models, the channel interfaces on the E1 Fiber Muxes meet the requirements of ITU-T Rec.
G.703. Each channel port on the E1 models has two line interfaces: a 120-ohm (Ω) balanced line interface,
terminated in an RJ-45 eight-pin connector, and a 75-ohm unbalanced interface, terminated in two BNC
coaxial connectors. Line coding is HDB3. The nominal balanced interface transmit level is ±3 V, and the
unbalanced interface transmit level is ±2.37 V. The maximum line attenuation is up to 6 dB, and each E1 signal
is processed by an adaptive equalizer that ensures optimal performance by compensating for various cable
lengths. Phase locked loops (PLL) are used to recover the clock signals, and the resulting jitter performance
complies with the requirements of ITU-T Rec. G.823.

Indicators common to both T1 and E1 versions

Each channel interface also has its own set of indicators that show the current state of the channel link. You can
use internal jumpers and switches to disable the alarm indications generated by unused interfaces. AIS data
streams are transmitted instead of failed or unconnected channel data streams.

2.3.3 S

ERVICE CHANNEL

The T1 or E1 Fiber Mux provides a full-duplex voice service channel. Operators of two units connected in a
link can communicate over this channel using standard headsets, which connect to sockets on the front panel.
When the local operator wants to speak to the remote operator, a CALL button is used. While this button is
pressed, a CALL indicator lights and an internal buzzer sounds on the remote unit. The proprietary
modulation method used for the service channel doesn’t affect range, and it enables the service channel to
operate independently of payload traffic (as long as the optical signal can be received at the remote end). This
way, operators at both ends can coordinate maintenance activities.

CHAPTER 2: Introduction

11

2.3.4 TEST AND DIAGNOSTIC CAPABILITIES

Each mux comes with comprehensive test and diagnostics capabilities, including local loopback on the fiber
link interface and remote loopbacks on each channel link. The remote loopbacks are activated on the remote
units. To perform activation, send a special test sequence through the fiber link. An automatic self-test on
power-up further enhances maintenance. For activation of the above and other loopbacks, see Chapter 6.

Alarms and alarm indications

The muxes can detect the following alarm conditions on each T1 or E1 and fiber interface:

• Loss of input signal.

• Loss of frame synchronization.

• Reception of alarm indication (AIS) signal, which consists of a continuous sequence of ones (“1”s).

NOTE

When AIS is received, loss of frame synchronization occurs. However, in this case, the
alarm indicating loss of frame synchronization is suppressed.

If the user isn’t using all of the channels, the user can disable the alarm indications related to the unused
channels. The response to alarm conditions is as follows:

• The detection of loss of fiber input signal, the reception of AIS on the fiber input, or loss of fiber frame
synchronization result in the transmission of AIS on each channel output.

• For each channel, an AIS signal is sent instead of the channel data stream through the fiber link upon
detection of loss of channel input signal, the reception of AIS on the channel input, or loss of channel
frame synchronization.

Front-panel indicators display each alarm condition. The mux also uses a dedicated connector to provide major
and minor alarm indications by means of dry contacts. The major alarm is activated in the following cases:

• The mux isn’t powered or there’s a total power-supply failure on either the primary or backup power
supply.

• There’s a loss of fiber optic input signals or loss of fiber optic frame synchronization.

• There’s a loss of channel input signals or loss of frame synchronization.

The minor alarm is activated in the following cases:

• There’s reception of AIS signal on the fiber optic input.

• There’s reception of AIS signal on channel inputs.

T1 AND E1 FIBER MUXES

12

2.3.5 MANAGEMENT AND MONITORING

The muxes are equipped with a front-panel RS-232 serial management port (“CONTROL”). This port operates
at user-selectable rates of 9.6, 19.2, and 38.4 kbps over a crossover cable (included). At the current time, the
management interface supports a single management method: via a supervision terminal. This can be an ASCII
terminal connected to the RS-232 port (or a PC running a terminal emulation program). The mux contains all
the software you need for performing the various management functions available through the terminal.

You will see SNMP management listed in the software’s main menu. However, the parameters for setting up an
SNMP-based system are reserved for future use.

2.3.6 P

OWER REQUIREMENTS

The T1 or E1 Fiber Mux includes two power supplies for redundancy. Each power supply supports AC
operation (100–240 VAC, 47–63 Hz), with each sharing the load; in case one of the supplies fails or its input
power is disconnected, the other power supply continues providing power to the mux. For DC power options,
call Technical Support.

2.4 Package Contents

Your mux package should contain the following items:

• T1 or E1 Fiber Mux.

• (1) DB9 male to DB9 female crossover cable.

• (2) Power-supply cables.

• Hands-free telephone headset.

• This users’ manual.

If anything is missing or damaged, please contact Black Box at 724-746-5500.

CHAPTER 3: Installation and Setup

13

3. Installation and Setup

3.1 Introduction

The T1 and E1 Fiber Muxes, shipped completely assembled, can be installed as desktop units or mounted in
19" racks with the optional Rackmount Kit (RM1001).

This chapter provides mechanical and electrical installation procedures for muxes, including the setting of the
internal jumpers and connecting the mux’s various interfaces.

After installing the mux, please refer to Chapter 4 for operating instructions and to Chapter 5 for system­configuration procedures.

If you encounter a problem, please refer to Chapter 6 for testing and diagnostics instructions.

WARNING

• No internal settings, adjustment, maintenance, or repairs may be performed by either
the operator or the user; such activities may be performed only by a skilled
technician who is aware of the hazards involved.

• Always observe standard safety precautions during product installation, operation,
and maintenance.

3.2 Site Requirements and Prerequisites

3.2.1 POWER

The mux should be installed within 5 feet (1.5 m) of an easily accessible grounded AC outlet capable of
furnishing a supply voltage in the range of 100 to 240 VAC.

3.2.2 C

HANNEL CONNECTIONS

On T1 Fiber Muxes

Each T1 Fiber Mux channel interface has one RJ-45 connector. Only one interface can be in use at any time.
The Appendix provides the pin allocation for the RJ-45 connector. The maximum allowable line attenuation
between each channel port and the user’s equipment is 2.4 dB.

On E1 Fiber Muxes

Each E1 Fiber Mux channel interface has one RJ-45 connector (for the balanced link interface) and two BNC
connectors (for the unbalanced interface). Only one interface can be in use at any time. The Appendix
provides the pin allocation for the RJ-45 connector. The maximum allowable line attenuation between each
channel port and the user’s equipment is 6 dB.

3.2.3 F

IBER LINK CONNECTIONS

Each fiber optic link interface is terminated in two ST connectors. See Table 2-1 for the maximum allowable
attenuation and other fiber optic interface characteristics.