7750 SR-a4 and 7750 SR-a8 Overview
Slot three supports one IOM-a. IOM-a cards occupy a full chassis slot. The IOM-a performs data forwarding from the ingress port to the egress port. There is no switch fabric for the
7750 SR-a4.
Slot four, the bottom slot, supports up to two CPM-a cards, designated as CPM A and CPM
B. In a redundant system, the CPM-a cards are installed in slots CPM A and CPM B. CPMa cards occupy a half of a chassis slot. In a simplex system, the CPM-a can be installed in slot
CPM A or CPM B; an impedance panel must be installed in the empty CPM-a slot.
Below slot four is a non-removable chassis filler plate.
Below the chassis filler plate, Power Supply Units are located at the bottom of the
7750 SR-a4 chassis, and are numbered PSU 1 to PSU 4, from left to right. Each PSU occupies one-quarter of a chassis slot. Two types of PSUs are available: one for universal AC power feeds and one for –48 VDC power feeds.
Chassis bundles for the 7750 SR-a4 include one PSU. PSUs are orderable items that are available for AC and DC power feeds. Alcatel-Lucent recommends that the PSUs be installed in an N+1 configuration. A PSU impedance panel must be installed in any empty PSU slot.
The right side of the chassis has one vertical slot for an air filter. The left side of the chassis has one vertical slot for the fan tray, which pulls air through the chassis from right to left.
7750 SR-a8 Chassis Features
The 7750 SR-a8 is a 200 Gb/s full-duplex system that is designed to be installed in an EIA
19-inch (482.6 mm) rack, where the chassis occupies 7 RU.
Figure 3 shows the front view of a populated 7750 SR-a8 chassis. Table 3
describes the features of the 7750 SR-a8 chassis.
The chassis can also be installed in an ETSI 600 mm wide by 300 mm deep rack. Adapter brackets are required to accommodate the 535-mm mounting width aperture of the ETSI rack.
The 7750 SR-a8 occupies 13 ETSI RU.
The CPM-a, IOM-a, and MDA-a cards, and the PSUs and fan tray must be installed after the chassis is mounted in the rack and grounded. All physical connections are made from the front of the chassis, including the chassis ground point. There are no connectors on the back of the chassis.
7750 SR-a4 and SR-a8 Installation Guide 27
7750 SR-a Chassis Features
1
2
2
3
5
Figure 3: 7750 SR-a8 Chassis Front View
R-a4 Fan Tray
Pwr
Stat
Pwr
Stat
Lnk Act
Lnk
1 2
Act Lnk
3 4
Act Lnk
5 6
Act Lnk
7 8
Act Lnk
9 10
Act Lnk
11 12
Act Lnk
13 14
Act Lnk
15 16
Act Lnk
17 18
Act Lnk
19 20
Act
Pwr
Stat
Lnk/Act
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44
1 2 3 4 5 6
Pwr
Stat
Lnk Act Lnk Act Lnk Act Lnk Act Lnk Act Lnk Act
7
Lnk Act
Pwr
S tat
Pwr
7750 SR-a Stat
Pwr
Stat
Lnk/Act
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44
13 14
Pwr
Stat
Lnk/Act 1 2 3 4 5 6 7 8 9 10 11 12
Lnk Act Lnk Act
1 2 3 4 5 6 7 8 9 10
Pwr
Stat
Lnk Act Lnk Act Lnk Act Lnk Act Lnk Act Lnk Act Lnk Act Lnk Act Lnk Act Lnk Act
Pwr
Stat
Lnk/Act
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44
1/1 XP
1/3
1/2
1/4
1
2/1 XP
2/3
2/2 XP
2/4
CPM A
2
CPM B
Pwr
7750 SR-a Stat
DTE DCE
Lnk Act Lnk Act
Pwr
Stat
Console
Critical Major
Alarms
Minor
ACO/LT
1PPS
Compact Flash
DTE DCE
Lnk Act Lnk Act
Pwr
Stat
Console
Critical Major
Alarms
Minor
ACO/LT
1PPS
Compact Flash
7750 SR-a8
Service Router
+ -
Pwr
S tat
6
6
8
7
4
24467
5
6
3
4
Key
1
2
7
8
Table 3: 7750 SR-a8 Chassis Front View Features
Description
7750 SR-a8 fan tray in vertical slot
IOM-a in chassis slots three and six
Chassis ground position on the chassis mounting flange
Up to four PSUs in the bottom chassis slot. Figure 3 shows impedance panels
in two of the four PSU positions.
ESD strap receptacle
Up to four MDA-a or MDA-aXP cards in the top two chassis slots and up to
four MDA-a or MDA-aXP cards in the chassis slots four and five
1
Up to two CPM-a cards in chassis slot seven
Air filter in vertical slot
1.
See 7750 SR-a8 Chassis Slot Allocation
for more information about MDA-a and MDA-aXP slots.
28 7750 SR-a4 and SR-a8 Installation Guide
