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BPX Switch Cabling Summary

BPX Switch Cabling Summary

This chapter specifies the cabling required to install the BPX switch:

Trunk Cabling

Trunk cables connect the customer DSX-3 crossconnect point or T3-E3 Interface Module to the BPX switch at the LM-3T3 back card. See Table 31-1.


Table 31-1: Trunk Cables
Cable Parameter Description

Type:

75-ohm coax cable (RG-59 B/U for short runs, AT&T 734A for longer runs). Two per T3/E3 line (XMT and RCV).

For European shipment of the BXM-E3 cards, in order to meet CE mark transient test requirement (IEC1000-4-4), RG-17G double shielded SMB cable must be used.

Max. Length:

450 feet max. between the BPX switch and the DSX-3/E3 point.

Connector:

Terminated in male BNC; Rx is receive from trunk, Tx is transmit to trunk.

Power Cabling

Power connections are made to the AC Power Supply Shelf or the DC Power Entry Module at the rear of the BPX switch. See Table 31-2 and Table 31-3. (next page) for acceptable cable and wire types.

AC Powered Nodes

AC power cables may be provided by you or ordered from Cisco. Several standard cables are available (see Table 31-2). AC cables with other plugs or different lengths may be special ordered.

For those who wish to construct their own power cable, the cable must mate with an IEC320 16/20A male receptacle on the rear of the AC Power Supply Assembly.


Table 31-2: AC Power Cables
Cable Parameter Description

Cable:

Provided with 8 feet (2.3 m.) of 3-conductor wire with plug.

Plug: customer end

20 A NEMA L620, 3-prong plug (domestic) or
13 A 250 Vac BS1363, 3-prong fused plug (UK, Ireland)
CEE 7/7 (Continental Europe)
AS3112 (Australia/New Zealand)
CEI23-16/VII (Italy)

DC Powered Nodes

DC wiring (Table 31-3) is generally provided by the customer.


Table 31-3: DC Power Wiring
Cable Parameter Description

Wiring:

Single conductor, 8 AWG recommended wire gauge, 75\xb0 C insulation rating, copper conductors only. Provision is provided for attaching conduit.

Connection:

90\xb0 ring lug for #10 screw terminal block.

LM-BCC Cabling

LM-BCC cabling connects data ports on the LM-BCC to Cisco WAN Manager network management workstations, control terminals, and modems. It is also used for external clock inputs from a clock source.

See for more details on peripherals that can be attached to these ports.

Auxiliary and Control Port Cabling

The auxiliary and control ports are used to connect one of the nodes in the network to a control terminal, StrataView NMS workstation, or modem connections for remote alarm reporting or system monitoring. Refer to Table 31-4 and Table 31-5 for details on this cable.


Table 31-4: Auxiliary and Control Port Cabling
Cable Parameter Description

Interface:

RS-232 DCE ports.

Suggested Cable:

24 AWG, 25-wire. A straight-through RS-232 cable is used for a terminal or printer connection. A null modem cable may be needed when interfacing with modems on either port.

Cable Connector:

DB-25, subminiature, male. Table 31-5 contains a list of the port pin assignments.

Max. Cable Length:

50 feet (15 m)


Table 31-5: Auxiliary and Control Port Pin Assignments
Pin# Name Source Description

1

FG

both

Frame Ground

2

TxD

DTE

Transmit Data

3

RxD

DCE

Receive Data

4

RTS

DTE

Request to Send

5

CTS

DCE

Clear to Send

6

DSR

DCE

Data Set Ready

7

SG

both

Signal Ground

8

CD

DCE

Carrier Detect

20

DTR

DTE

Data Term Ready

LAN Port Cabling

The LAN connection is used to connect one of the nodes in the network to a Cisco WAN Manager NMS workstation. See Table 31-6 and Table 31-7.


Table 31-6: LAN Port Cabling
Cable Parameter Description

Interface:

Ethernet DCE port.

Suggested Cable:

TBS

Cable Connector:

DB-15, subminiature, male.
Table 31-7 contains a list of the port pin assignments.

Max. Cable Length:

50 feet (15 m.) max. to interface adapter.


Table 31-7: LAN Port Pin Assignments
Pin # Name Pin # Name

1

Shield

---

---

2

Collision Presence +

9

Collision Presence -

3

XMT +

10

XMT -

4

Reserved

11

Reserved

5

RCV +

12

RCV -

6

Power return

13

Power (+12V)

7

Reserved

14

Reserved

8

Reserved

15

Reserved

Modem Cabling

Refer to Chapter 15, Connecting Temporary Terminal and Attaching Peripherals, for modem cabling information.

External Clock Input Cabling

This cabling is for making external clock connections for use by the BCC-32 and BCC-4 backcards.

The BCC-32 uses the BCC-bc backcard.

The discontinued BCC-3 and BCC-4 both use the BCC-3-bc backcard.

T1 Clock Cabling

Table 31-8 through Table 31-11 lists T1 clock cabling details.


Table 31-8: External Clock Cabling
Cable Parameter Description

Cable Type:

22 AWG, ABAM individually shielded twisted pair. Two pair per T1 line (1 transmit and 1 receive).

Cable Connector:

Male DB-15 subminiature. See Table 31-10 through Table 31-11 for pinouts.

Max. Cable Length:

533 ft (162 m.) maximum between the BPX switch and the first repeater or CSU. Selection of cable length equalizers.


Table 31-9: T1 Connection to XFER TMG on BCC-bc
Pin # Description

1

Transfer timing ring

2

Transfer timing tip

3 & 4

Transfer timing shield


Table 31-10: T1 Connection to EXT TMG on BCC-bc
Pin # Description

2

Receive pair shield

3

Receive tip

11

Receive ring


Table 31-11: T1 Connection to EXT 1 or EXT 2 on BCC-3-bc
Pin # Description Function

1

Transmit tip

Transmit T1 timing signal synchronized to the node

2

Transmit pair shield

3

Receive tip

Receive clock for synchronized clock source for node

4

Receive pair shield

7

Transfer timing tip

8

Transfer timing shield

9

Transmit ring

11

Receive ring

15

Transfer timing ring

E1 Clock Cabling

Table 31-12 through Table 31-15 lists E1 clock cabling details.


Table 31-12: E1 Connector Pin Assignments for External Clock
Connector Description

Cable Type:

75-ohm coax cable for unbalanced connection or 100-120-ohm twisted pair for balanced connection. Two cables/pairs (1 transmit, 1 receive) per E1 line.

Cable Connector:

Two female BNC for unbalanced connection; male DB15 for balanced connection. See Table 31-13 and Table 31-15 for pinouts.

Max. Cable Length:

Approximately 100 meters maximum between the BPX switch and the first repeater or CSU. Equalizer for cable length.


Table 31-13: E1 Connection 75 Ohm to EXT TMG on BCC-bc or BCC-3-bc
Connector Description

BNC

Receive E1 from trunk


Table 31-14: E1 Connection 100/120 Ohm to EXT TMG on BCC-bc
Pin # Description

2

Receive pair shield

3

Receive tip

11

Receive ring


Table 31-15: E1 Connection 100/120 Ohm to EXT 1 or EXT 2 on BCC-3-bc
Pin # Description Function

1

Transmit tip

Transmit T1 timing signal synchronized to the node

2

Transmit pair shield

3

Receive tip

Receive clock for synchronized clock source for node

4

Receive pair shield

7

Transfer timing tip

8

Transfer timing shield

9

Transmit ring

11

Receive ring

15

Transfer timing ring

External Alarm Cabling

This cable (Table 31-16) is for connecting network alarm outputs to the LM-ASM ALARM OUTPUT connector only. Table 31-17 lists the pinouts for the network alarm outputs.


Table 31-16: External Alarm Cabling
Cable Parameter Description

Interface:

Dry-contact relay closure

Wire:

24 AWG, shielded, 6-pair

Connector:

DB-15, Subminiature, male


Table 31-17: Network Alarm Pin Assignments
Pin Alarm Description

1

Audible—Major

Normally open

2

Common

9

Normally closed

4

Visual—Major

Normally open

5

Common

12

Normally closed

7

unused

n.c.

8

unused

n.c.

3

Audible—Minor

Normally open

11

Common

10

Normally closed

6

Visual—Minor

Normally open

14

Common

13

Normally closed

15

unused

n.c.

Standard BPX Switch Cables

Table 31-18 lists the various cables that may be ordered directly from Cisco.

Cable lengths are specified as a suffix to the Cisco model number. For example 5610-50 indicates a 50 foot cable. Cables are generally available in standard lengths of:

Lengths of 101 ft. (30 m.) to 600 ft. (183 m.) are available on a special order.

When a cable is connectorized, the connector gender (male-female) is indicated as well as the number of pins. For example RS-232/M25-M25 indicates a cable terminated with a male DB25 at both ends.


Table 31-18: Standard Cables Available from Cisco
Model# Description Usage

T3-E3-10
T3-E3-25
T3-E3-50
T3-E3-75
T3-E3-xx

75 W coax/BNC-BNC, 10'
75 W coax/BNC-BNC, 25'
75 W coax/BNC-BNC, 50'
75 W coax/BNC-BNC, 75'
length to be specified

T3 or E3 trunk interface

5620

RS-232/M25-F25

Control port to control terminal, StrataView, or ext. window device

5621

RS-232/M25-M25 special

Control or Aux. port to modem

5623

RS-232/M25-M25

Aux. port to ext. window device

5601

Ground cable

DC

5670

Molex-pigtail

DC

5671

Spade lug-pigtail

DC

Redundancy "Y" Cable

The redundancy cables are a special "Y" cable available from Cisco. They are required for redundant trunk and data interfaces.

Table 31-19 lists the Y-cables used with various BPX switch back cards.


Table 31-19: Redundancy Y-Cables
Y - Cable Used On Cisco P/N

T3 trunk

LM-3T3

TBS

E3 trunk

LM-3E3

TBS

Aux./Cont. ports

LM-BCC

TBS

Ext. Clk. In

LM-BCC

TBS

Ext. Clk. Out

LM-BCC

TBS


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Posted: Fri Jul 27 18:02:14 PDT 2001
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