A trunk cable connects each T3 port on the BNC-2T3 back card to a T3 port on the co-located BPX-8600-series node. See Table B-1 and Table B-2 for details.

Table B-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 line (XMT and RCV).
Max. Length	450 feet max. between the BPX 8600-series node and the MGX 8250 node.
Connector:	Terminated in male BNC; Rx is received from trunk, Tx is transmitted to trunk.

Table B-2: T3 Connector Pin Assignments

Connector	Description
Rx BNC	Receive T3 from trunk
Tx BNC	Transmit T3 to trunk

Frame Relay Cabling

This section describes the cabling and connector pinouts for the Frame Relay cards.

1 Cabling

Trunk cables connect the customer DSX-1 cross-connect point or T1 Channel Service Unit (CSU) to the node at the T1 back card.See Table B-3 and Table B-4 for details.

Table B-3: T1 Trunk/Circuit Line Cabling Specification

Cable Parameter	Description
Cable Type	Western Electric 22 AWG, ABAM individually shielded twisted pair (100 ohm balanced). Two pair per T1 line (1 transmit and 1 receive).
Cable Connector	Male DB-15 subminiature.
Max. Cable Length	533 ft. (162 m) maximum between the MGX 8250 node and the first repeater or CSU. Selection of cable length equalizers.

Table B-4: T1 Connector Pin Assignments

Pin No.	Description
1	Transmit, Tip
2	Transmit Pair Shield
3	Receive, Tip
4	Receive Pair Shield
9	Transmit, Ring
11	Receive, Ring

Note Transmit direction is toward the T1 trunk.

E1 Cabling

E1 cables are equipped with either BNC connectors or DB15 connectors.

BNC Connector

E1 trunk cables connect the customer DSX-1 cross-connect point or E1 Channel Service Unit (CSU) to the node at the FRSM E1 back card (BNC-8E1). See Table B-5 and Table B-6.

Table B-5: E1 Trunk/Circuit Line Cabling Specification

Cable Parameter	Description
Cable Type: BNC-8E1	75-ohm coax cable for unbalanced 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 Tables A-2 and A-3 for pinouts.
Max. Cable Length	Approximately 100 meters maximum between the MGX 8250 node and the first repeater or CSU. Equalizer for cable length.

Table B-6: E1 Connector Pin Assignments (unbalanced)

Connector	Description
Rx BNC	Receive E1 from trunk
Tx BNC	Transmit E1 to trunk

DB15 Connector

E1 trunk cables connect the customer DSX-1 cross-connect point or E1 CSU to the node at the FRSM E1 back card (DB15-8E1). See Table B-7 and Table B-8.

Table B-7: E1 Trunk/Circuit Line Cabling Specification

Cable Parameter	Description
Cable Type: DB15-8E1'	Western Electric 22 AWG, ABAM individually shielded twisted pair (120 ohm balanced). Two pair per T1 line (1 transmit and 1 receive).
Cable Connector:	Male DB-15 subminiature.
Max. Cable Length:	533 ft. (162 m) maximum between the MGX 8250 node and the first repeater or CSU. Selection of cable length equalizers.

Table B-8: E1 Connector Pin Assignments

Pin No.	Description
1	Transmit, Tip
2	Transmit Pair Shield
3	Receive, Tip
4	Receive Pair Shield
9	Transmit, Ring
11	Receive, Ring

Note Transmit direction is toward the E1 trunk.

The back card for the MGX-FRSM-HS1/B is the 12IN1-S4. Each port on the back card connects through a DTE version or DCE version of the Cisco 12IN1 cable. For the signals on the back card, see Table B-10 and Table B-11. The tables show the signal acronym, signal name, and signal source. The signal depends whether the back card connector is either DTE or DCE and whether the back card has been set as either X.21 or V.35 as listed in Table B-9. For the part numbers of the standard and nonstandard versions of the 12IN1 cables, see Table B-12.

Table B-9: 12IN1-S4 Cable Types

Cable Type	X.21	V.35
DCE	X.21 DCE	V.35 DCE
DTE	X.21 DTE	V.35 DTE

Note The cable type and part number are printed on a plastic band located near the smaller connector.

Table B-10: V.35 Signals

Signal	Name	Source
RTS	Request to Send	DTE
DTR	Data Terminal Ready	DTE
CTS	Clear To Send	DCE
DSR	Data Set Ready	DCE
DCD	Data Carrier Detect	DCE
GND	Ground	both
B_LL	Local Loopback	DTE
GND	Ground	both
TxD+	Transmit Data	DTE
TxD-	Transmit Data	DTE
RxD+	Receive Data	DCE
RxD-	Receive Data	DCE
TXCE	Secondary Clear to Send	DTE
TXCE	Secondary Clear to Send	DTE
RxC+	Receive Clock	DCE
RxC-	Receive Clock	DCE
TxC+	Transmit Clock	DCE
TxC-	Transmit Clock	DCE

Table B-11: X.21 Signals

Signal	Name
Mode_2	Local connections
Mode_DCE	Local connections
Ground	Shield Ground
O_TXD/RSC+	Transmit +
OTXD/RXD-	Transmit -
O_RTS/CTS+	Control +
O_RTS/CTS-	Control -
I_RDX/TXD+	Receive +
I_RXD/TXD-	Receive -
ICTS/RTS+	Indication +
I_CTS/RTS-	Indication -
I_RXC/TXCE+	Timing +
I_RXC/TXCE-	Timing -
GND	CCT Ground

Table B-12: Cable Part Numbers for MGX-FRSM-HS1/BV

Type of Cable	Far End Connector	Part Number
X.21 DTE	male	72-1440-01
X.21 DCE	female	72-1427-01
V.35 DTE	male (standard)	72-1428-01
V.35 DTE	female (atypical)	72-1436-01
V.35 DCE	female (standard)	72-1429-01
V.35 DCE	male (atypical)	72-1437-01
V.35 DTE-DCE		72-1441-01
Straight-through		72-1478-01
Loopback plug		72-1479-01

HSSI Port Connectors

The High Speed Serial Interface (HSSI) port connects through a female SCSI-II connector. This connector accords with ANSI/TIA/EIA-613. See Table B-13 for the pinouts.

Table B-13: Pinouts for SCSI-II Connector

Pin No.	Name	Signal Function	Polarity	Signal Source
11	SD	Send Data	+	DTE
36			-
4	RD	Receive Data	+	DCE
29			-
6	ST	Send Timing	+
31			-
2	RT	Receive Timing	+
27			_
6	TT	Terminal Timing	+	DCE
13			-
3	CA	DCE Available	+	DCE
28			-
8	TA	DTE Available	+	DTE
33			-
10	LA	Loop Ckt A	+	DTE
35			-
12	LB	Loop Ckt B	+	DTE
37			-
5	LC	Loop Ckt C	+	DCE
30			-
1, 26, 7, 32, 13, 38, 19, 44, 25, 50	SG	Signal Ground

Cabling for RJ-48 Connectors on T1 and E1 Ports

For T1 and E1 ports that connect through a RJ-48 connector, each connector has

Transmit TIP pin
Transmit RING pin
Receive TIP pin
Receive RING pin
Two pins for shielded ground

An illustration of the connector wiring appears in Figure B-1.

Figure B-1: RJ-48 Connectors

DC Power Cabling

DC Power connections are made to the DC Power Entry Modules at the rear of the MGX 8250 node. (See Figure B-2.) See Table B-14 and Table B-15 for acceptable cable and wire types. Cisco normally does not provide wiring for DC-powered systems. See Table B-14 for details on DC wiring.

Table B-14: DC Power Wiring

Cable Parameter	Description
Wiring:	Three conductor, 12 AWG recommended wire gauge, min. 60ºC insulation rating, copper conductors only. Solid or stranded wires. Wire insulation stripped back 0.25 in (6 mm) at the MGX 8250 connector end.
Connection:	EURO Block.

Figure B-2: DC Power Connections

AC Power Cabling

Either Cisco Systems or the customer can provide the AC power cord. See Table B-15 for the power cords that Cisco can supply. In addition, you can special-order AC cables with other plugs or different lengths. If you want to construct the power cord, it must mate with an IEC320 16/20A male receptacle on the back of the AC power module.

Table B-15: AC Power Cables

Cable Parameter	Description
Cable	Provided with 8 feet (2.3 m) of 3-conductor wire with plug.
Plug: customer end	20A NEMA L620, 3-prong plug (U.S.) 13A 250 VAC BS1363, 3-prong fused plug (U.K., Ireland) CEE 7/7 (Continental Europe) AS3112 (Australia, New Zealand) CEI23-16/VII (Italy)

Control and Clock Cabling

This section describes the cables that connect to the PXM-UI-S3 card.

Maintenance and Control Ports

The maintenance (or modem) port and the control (or console) port connect a node to an ASCII terminal, workstation, or modem for remote alarm reporting or system monitoring. See Table B-16 for a description of the cabling and Table B-17 for the pinout of the associated RJ-48 connector.

Table B-16: Maintenance and Control Port Cabling

Cable Parameter	Description
Interface	EIA/TIA-232—both are DTE ports.
Suggested Cable	24 AWG, 25-wire. A straight-through EIA/TIA-232 cable provides a terminal or printer connection. For an interface with modems on either port, a null modem cable may be necessary.
Cable Connector	RJ-48, subminiature, male. Table B-17 contains a list of the port pin assignments.
Max. Cable Length	50 feet (15 m)

Table B-17: Maintenance and Control Port Pin Assignments

Pin No.	Name	Description
1	RTS out	Request to Send
2	DTR out	Data Terminal Ready
3	TxD	Transmit Data
4	GND	Chassis ground
5	GND	Chassis ground
6	RxD	Receive Data
7	DSR	Data Set Ready
8	CTS	Clear to Send

Modem Cable

Figure B-3 shows a modem cable that is used for connecting modems to the MGX 8250 control and maintenance ports.

Figure B-3: Null Modem Cable

External Clock Input Cabling

The external clock input cable connects the external clock inputs through the T3E3-D, T3E3-B, and SMF-155 EXT. TMG connectors. The clock may be 1.544 Mbps for T3E3-D or 2.048 Mbps for T3E3-D.

External Clock Input Cabling

The MGX 8250 has two external clock input connectors:

1. T1 RJ-48 connector

2. E1 SMB connector.

T1 Clock Cabling

The clock port can accept a T1 or E1 BITS clock input. (See Table B-18)

Table B-18: 7T1 Clock Cabling

Pin No.	Name
1	Tx ring out
2	Tx tip out
3	Ground
4	Rx ring in
5	Rx tip in
6	No comment
7	Test point ring out
8	Test point tip out

External Alarm Cabling

The external alarm cable connects to the Alarm connector on the PXM1-UI card. See Table B-19 for physical characteristics of the cable and Table B-20 for the pinouts.

Table B-19: External Alarm Cabling

Cable Parameter	Description
Interface	Dry-contact relay closure.
Wire	24 AWG, shielded, 6-pair.
Connector	DB-15, subminiature, male.

Table B-20: Network Alarm Pin Assignments

Pin No.	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 MGX 8250 Cables

For a list of the standard cables that Cisco can supply for the MGX 8250 switch, see Table B-21. The suffix to the model number indicates the length of the cable. For example, 5610-50 indicates a 50-foot cable. Cables are available in standard lengths of 10 ft. (3 m), 25 ft. (7.6 m), 50 ft. (15 m), 75 ft. (22.8 m), and 100 ft. (30 m). Lengths of 100 ft. (30 m) to 600 ft. (183 m) are available through a special order.

Where applicable, Table B-21 includes the gender of the connector and the number of pins. For example, EIA/TIA-232/M25-M25 indicates a cable terminated with a male DB25 at both ends.

Table B-21: Standard Cables Available from Cisco

Model Number	Description	Usage
T3-E3-10 T3-E3-25 T3-E3-50 T3-E3-75 T3-E3-xx	75 ohm coax/BNC-BNC, 10' 25' 50' 75' length to be specified	T3 or E3 trunk interface
5620	EIA/TIA-232/M25-F25	PXM1-UI maintenance port to control terminal, Cisco WAN Manager, or external window device
5621	EIA/TIA-232/M25-M25 special	Control or maintenance port to modem
5601	Ground cable	DC power
5670	Molex-pigtail	DC power
5671	Spade lug-pigtail	DC power

Redundancy Y-Cable

Special Y-cables provide line redundancy where applicable. (The Service Resource Module can also provide redundancy where certain Y-cables do not apply.) Table B-22 lists the Y-cables used with various MGX 8250 cards.

Table B-22: Y-Cable Product Names for Applicable Cards

Applicable Card Name	Connector Hardware	Type/Standard Interface	Product Number
PXM1-UI	RJ-45	EIA/TIA-232	CAB-5684-06 (6-inch Y)
PXM1-UI	RJ-45	EIA/TIA-232	CAB-5684-18
PXM1-UI	RJ-45	T1 BITS Clock	CAB-5686-06 (6-inch Y)
PXM1-UI	SMB	E1 BITS Clock	CAB-5681-06 (6-inch Y)
PXM1-UI	SMB	E1 BITS Clock	CAB-5681-18 (18-inch Y)
PXM1-UI	DB15	Alarm Output	CAB-5607-10 (10-inch Y)
PXM1-4-155	SC	SMF, MMF	CAB-SMF-Y-SC
PXM1-1-622	SC	SMF	CAB-SMF-Y-SC
PXM1-2T3E3	BNC	75 ohm, coaxial	CAB-T3E3-Y
MGX-BNC-3T3-M	BNC	75 ohm, coaxial	CAB-T3E3-Y
MGX-FRSM-2T3E3	BNC	75 ohm, coaxial	CAB-T3E3-Y
MGX-CESM-T3E3	BNC	75 ohm, coaxial	CAB-T3E3-Y
MGX-FRSM-HS2	SCSI2		CAB-SCSI2-Y
SMSCFC010250-01M	SC to FC		72-1246-01

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